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Use r Ma nual, V 1.7, Ja nuary 2001
C166S V2
1 6 - B i t M ic r o c o n t r o l l e r
M i c r o c o n t ro l le r s
Never
stop
thinking.
Edition 2001-01 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 Munchen, Germany
(c) Infineon Technologies AG 2001.
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
Use r Ma nual, V 1.7, Ja nuary 2001
C 1 6 6 S V2
1 6 - B i t M icr o c ontroller
M i c r o c o n t ro l le r s
Never
stop
thinking.
C166S V2 Revision History: Previous Version: Page 2001-01 V 1.7
Subjects (major changes since last revision)
We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: ce.cmd@infineon.com
User Manual C166S V2
Table of Contents 1 1.1 1.2 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 1.2.10 2 2.1 2.2 2.3 2.3.1 2.3.2 2.3.3 2.3.3.1 2.3.3.2 2.3.4 2.3.5 2.3.6 2.3.6.1 2.3.6.2 2.4 2.4.1 2.4.2 2.4.3 2.4.3.1 2.4.3.2 2.5 2.5.1 2.5.2 2.5.2.1 2.5.2.2 2.5.2.3 2.5.2.4 2.5.3 2.5.4 Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Technical Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 On-Chip Memory Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Data Management Unit (DMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Program Memory Unit (PMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Interrupt and PEC Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 OCDS and JTAG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 External Bus Controller (EBC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 System Control Unit (SCU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Clock Generation Unit (CGU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 On-Chip Bootstrap Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Central Processing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Description Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CPU Special Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruction Fetch and Program Flow Control . . . . . . . . . . . . . . . . . . . . . . . Branch Target Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Branch Detection and Branch Prediction . . . . . . . . . . . . . . . . . . . . . . . . Sequential and Mispredicted Instruction Flow . . . . . . . . . . . . . . . . . . . . Correctly Predicted Instruction Flow . . . . . . . . . . . . . . . . . . . . . . . . . Incorrectly Predicted Instruction Flow . . . . . . . . . . . . . . . . . . . . . . . . Atomic and Extend Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Code Addressing via Code Segment and Instruction Pointer . . . . . . . . IFU Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The CPU Configuration Register CPUCON1 . . . . . . . . . . . . . . . . . . . The CPU Configuration Register CPUCON2 . . . . . . . . . . . . . . . . . . . Use of General Purpose Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory Mapped GPR Banks and the Global Register Bank . . . . . . . . Local Register Bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Context Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Changing the selected Physical Register Bank . . . . . . . . . . . . . . . . . Context Switching of the Global Register Bank . . . . . . . . . . . . . . . . . Data Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Short Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Long and Indirect Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . Addressing via Data Page Pointer DPP . . . . . . . . . . . . . . . . . . . . . . DPP Override Mechanism in the C166S V2 CPU . . . . . . . . . . . . . . . Long Addressing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indirect Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DSP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The CoREG Addressing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
15 17 18 19 20 22 24 24 26 27 28 30 30 31 34 36 40 40 40 42 45 46 48 49 51 52 53 56 63
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Table of Contents 2.5.5 2.6 2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.6.6 2.7 2.7.1 2.7.2 2.7.3 2.7.4 2.7.5 2.7.6 2.7.7 2.7.8 2.7.9 2.7.10 2.7.11 2.8 3 3.1 3.2 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.4 3.4.1 3.5 3.6 3.6.1 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 5 Page 64 68 68 70 70 70 71 74 78 79 80 80 80 81 81 82 82 84 85 88 89
The System Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-bit Adder/Subtracter, Barrel Shifter, and 16-bit Logic Unit . . . . . . . . Bit Manipulation Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multiply and Divide Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Processor Status Word PSW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parallel Data Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Representation of Numbers and Rounding . . . . . . . . . . . . . . . . . . . . . . The 16-bit by 16-bit signed/unsigned Multiplier and Scaler . . . . . . . . . . Concatenation Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One-bit Scaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The 40-bit Adder/Subtracter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Data Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Accumulator Shifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The 40-bit Signed Accumulator Register . . . . . . . . . . . . . . . . . . . . . . . . The Repeat Counter MRW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The MAC Unit Status Word MSW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The MAC Unit Control Word MCW . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dedicated CSFRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C166S V2 Memory Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Data Organization in Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Internal Program Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 DPRAM, Internal SRAM, and SFR Areas . . . . . . . . . . . . . . . . . . . . . . . . . 94 Data Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Special Function Register Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 IO Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 PEC Source and Destination Pointers . . . . . . . . . . . . . . . . . . . . . . . . . . 97 External Memory Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Boot and Debug/Monitor Program Memories . . . . . . . . . . . . . . . . . . . . 98 Crossing Memory Boundaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 System Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Data Organization in Global General Purpose Registers . . . . . . . . . . 100 Instruction Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruction Dependencies in Different Pipeline Stages . . . . . . . . . . . . . . The General Purpose Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indirect Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory Bandwidth Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CPU-SFRs and the Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 104 104 106 107 110
Interrupt and Exception Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
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5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.3 5.3.1 5.3.2 5.4 5.4.1 5.4.2 5.4.3 5.4.4 5.5 6 6.1 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.3 6.3.1 6.3.2 6.3.3 6.3.4 6.3.5 6.3.5.1 6.3.5.2 6.3.6 6.3.6.1 6.3.6.2 6.3.6.3 6.3.7
Interrupt System and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Interrupt System Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Vector Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Jump Table Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status and Switch Context Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Control Functions in the PSW . . . . . . . . . . . . . . . . . . . . . . . . Saving the Status during Interrupt Service . . . . . . . . . . . . . . . . . . . . . Context Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fast Bank Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Software Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peripheral Event Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PEC Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The PEC Source and Destination Pointer . . . . . . . . . . . . . . . . . . . . . . PEC Handler Interrupt Actions Summary . . . . . . . . . . . . . . . . . . . . . . PEC Channel Assignment and Arbitration . . . . . . . . . . . . . . . . . . . . . . CPU Action Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Bus Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timing Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Register Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The EBC MODE Registers EBCMODx . . . . . . . . . . . . . . . . . . . . . . . . The Timing Configuration registers TCONCSx . . . . . . . . . . . . . . . . . . The Function Configuration Registers FCONCSx . . . . . . . . . . . . . . . . The Address Window Selection Registers ADDRSELx . . . . . . . . . . . . Definition of Address Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Address Window Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ready Controlled Bus Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Synchronous/Asynchronous READY . . . . . . . . . . . . . . . . . . . . Combining the READY function with predefined wait states . . . . . . EBC Idle State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
118 118 120 122 124 125 127 127 129 130 131 132 132 133 138 139 145 147 149 151 153 153 154 157 157 157 157 157 158 158 158 158 161 163 164 164 166 167 167 168 168 169
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6.4 6.4.1 6.4.1.1 6.4.1.2 6.4.1.3 6.4.1.4 6.4.2 6.5 7 7.1 7.2 7.3 8 8.1 8.2 8.3 9 9.1 9.2 9.2.1 9.2.2 9.3 9.3.1 9.3.2 9.4 9.4.1 9.4.2 10
Multi Master Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Bus Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initialization of Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Arbitration Master Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Arbitration Slave Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Locking the Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connecting Multimaster Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fastest possible external access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Short Instruction Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruction Opcodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detailed Instruction Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DSP Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instructions for OCDS/ITC injection and System Control . . . . . . . . . . . . Summary of CPU/Subsystem Registers . . . . . . . . . . . . . . . . . . . . . . . General Purpose Registers (GPRs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Core Special Function Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered by Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered by Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Overview Interrupt and Peripheral Event Controller . . . . . . . . . Ordered by Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered by Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Overview External Bus Controller . . . . . . . . . . . . . . . . . . . . . . . Ordered by Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered by Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
169 169 169 170 171 171 172 173 175 175 178 192 205 212 315 417 421 421 423 423 424 426 426 427 430 430 431
Keyword Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
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Introduction
1
Introduction
C166S V2 is a member of the most recent generation of the popular C166 microcontroller cores. C166S V2 combines high performance with enhanced modular architecture. It was developed to provide easy migration from standard existing C16x to the new C166S V2 core with its impressive DSP performance and advanced interrupt handling. The system architecture inherits successful hardware and software concepts that have been established in the C16x 16-bit microcontroller families. C166 code compatibility enable re-use of existing code. This dramatically reduces the time-tomarket for new product development. The following features position C166S V2 strategically for contemporary and emerging markets for performance-hungry real-time applications: - High CPU performance. Single clock cycle execution doubles the performance at the same CPU frequency (relative to the performance of the C166). - Built-in advanced MAC unit dramatically increases DSP performance. - High Internal Program Memory bandwidth and the instruction fetch pipeline significantly improve program flow regularity and optimize fetches into the execution pipeline. - Sophisticated Data Memory structure and multiple high-speed data buses provide transparent data access (0 cycles) and broad bandwidth for efficient DSP processing. - Advanced exceptions handling block with multi-stage arbitration capability yields stellar interrupt performance with extremely small latency. - Upgraded Peripheral Event Controller supports efficient and flexible DMA features to support a broad range of fast peripherals. - Highly modular architecture and flexible bus structure provide effective methods of integrating application-specific peripherals to produce customer-oriented derivatives. This User's Manual describes the new standard C166S V2 core independently from its use for the dedicated product. Differencies to existing standard products are therefore described in the User's Manual (or Target Specification) of the product.
1.1
- - - - - - - - - -
Technical Overview
5-stage execution pipeline 2-stage instruction fetch pipeline with FIFO for instruction pre-fetching Pipeline with forwarding that controls data dependencies in hardware Linear address space for code and data (von Neumann architecture) Multiple high bandwidth internal busses for data and instructions Enhanced memory map with extended I/O areas 16 MBytes total linear address space C16x family compatible on-chip special function register area Fast multiplication (16-bit x 16-bit) in one CPU clock cycle Fast background execution of division (32-bit/16-bit) in 21 CPU clock cycles
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Introduction - - - - - - - - - - - - - - - - - Nearly all instructions executed in one CPU clock cycle Enhanced boolean bit manipulation facilities Zero cycle jump execution Additional instructions to support High Level Language (HLL) and operating systems Register-based design with multiple variable register banks Two additional fast register banks General purpose register architecture 16 General-purpose registers (GPRs) for byte operands 16 General-purpose registers (GPRs) for integer operands Overlapping 8-bit and 16-bit registers Opcode fully upward compatible with C166 family Variable stack with automatic stack overflow/underflow detection High performance branch-, call- and loop processing Multiply and accumulate instructions (MAC) executed in one CPU clock cycle Extremely short interrupt response time "Fast interrupt" and "Fast context switch" features Peripheral bus (PDBUS+) with bit protection
1.2
* * * * * * * * *
System Description
The basic C166S V2 System consists of the following main units: C166S V2 CPU On-Chip Data- and Code-Memories Data Management Unit (DMU) Program Management Unit (PMU) Interrupt and Peripheral Event Controller (PEC) Controller OCDS and JTAG-Interface External Bus Controller (EBC) System Control Unit (SCU) Clock Generation Unit (CGU)
The powerful C166S V2 core, the peripherals, and the internal memories of the C166S V2 microcontroller are connected to various busses: * * * * 16-bit high performance system bus 16-bit enhanced peripheral bus (PDBUS+) 64-bit internal program memory bus 16-bit data memory bus
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Introduction Figure 1-1 shows a typical configuration of a C166S V2-based system.
C166S V2 MegaCore 16
Data Memory
PMU C166S V2 CPU 64 64 up tp 3 kBytes DPRAM up tp 24 kBytes SRAM
Program Memory
DMU up to 4MBytes Break Interface Injection Interface Trace Interface
WDT Interrupt Controller and Peripheral Event Controller
PLL
SCU
CGU
C166S V2 System
PDBUS+
16
OSC
16
High Speed System Bus
EBC OCDS JTAG
Config. Block
Peripheral 1
Periheral 2
Peripheral ....
Peripheral n
External Bus Interface
PORT
PORT
PORT
CLKOUT CLKOUT
Dedicated Pins
CONFIG
External
RESET
XTAL1
XTAL2
JTAG
NMI
Figure 1-1
C166S V2 System
1.2.1
- - - - - - - - - - - - - - - -
CPU
5-stage execution pipeline 2-stage instruction fetch pipeline with FIFO for instruction pre-fetching Pipeline with forwarding that controls data dependencies in hardware Flexible PMU and DMU with cache capabilities Linear address space for code and data (von Neumann architecture) Multiple high bandwidth internal busses for data and instructions 16 MBytes total linear address space Nearly all instructions executed in one CPU clock cycle Enhanced boolean bit manipulation facilities Zero cycle jump execution Additional instructions to support HLL and operating systems Register-based design with multiple variable register banks Two additional fast register banks General purpose register architecture 16 General-purpose registers (GPRs) for byte operands 16 General-purpose registers (GPRs) for integer operands
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User Manual C166S V2
Introduction - Overlapping 8-bit and 16-bit registers Multiply Accumulate Unit (MAC) - Single cycle MAC with zero cycle latency including a 16*16 multiplier plus 40-bit barrel shifter; single clock multiplication is ten times faster than C166 at the same CPU clock - 40-bit accumulator to handle overflows - Automatic saturation to 32 bit or rounding included with the MAC instruction - Fractional numbers supported directly - One Finite Impulse Response Filter (FIR) tap per cycle with no circular buffer management
1.2.2
- - -
On-Chip Memory Modules
Up to 3 KBytes on-chip dual ported SRAM for DSP data and register banks Up to 24 KBytes on-chip internal single ported SRAM module for data storage Up to 4 MBytes on-chip memory module for program storage
Note: The on-chip memory configuration may differ from product to product. Product specific on-chip memory configurations are defined in the corresponding product specifications.
1.2.3
Data Management Unit (DMU)
The Data Management Unit (DMU) handles all data transfers external to the core (i.e. external memory or on-chip special function registers on the PDBUS+) and instruction fetches in external memory. The DMU acts as a data mover between the various interfaces. By handling all these interfaces, it incorporates the C166S V2 System Bus. An access prioritization between External BUS Controller (EBC) accesses from the core and Program Memory Unit (PMU) is handled by the DMU. This allows an instruction fetch from external memory in parallel with data access that is not on EBC.
1.2.4
Program Memory Unit (PMU)
The PMU has two basic functions: to provide the CPU with instructions and to provide the CPU (through the DMU) with data located in the Internal Program Memory. The Internal Program Memory is implemented within the PMU. The instructions requested by the CPU can be located in the Internal Program Memory; in which case, the instructions are requested to the internal memory. Alternatively, they can be located in external memory; in which case, the PMU re-sends this request to the EBC through the DMU, receives the data from the external memory, through the EBC/ DMU, and delivers it as the requested instruction to the CPU.
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Introduction
1.2.5
Interrupt and PEC Controller
- 16-Priority-level interrupt system with up to 128 sources on four group levels - Eight PEC channels with 24-bit source and destination pointers with segment pointer registers - Enhanced PEC pointers. PEC source pointers and PEC destination pointers can be simultaneously modified - Independent programmable PEC level and "End of PEC" interrupt
1.2.6
OCDS and JTAG
The OCDS (level 1) provides facilities to the debugger to emulate resources and assist in application program debug. The main features are: - Real time emulation - Extended trigger capability including: instruction pointer events, data events on address and/or value, external inputs, counters, chaining of events, timers, etc. - Software break support - Break and "break before make" (on IP events only) - Interrupt servicing during break or monitor mode - Simple monitor mode or JTAG based debugging through instruction injection The C166S V2 OCDS is controlled by the debugger1) through a set of registers accessible from the JTAG interface. The OCDS also receives informations (such as IP, data, status) from the core for monitoring the activity and generating triggers. Finally, the OCDS interacts with the core through a break interface to suspend program execution, and through an injection interface to allow execution of OCDS generated instructions.
1.2.7
External Bus Controller (EBC)
All external memory accesses are performed by a particular on-chip External Bus Controller (EBC).
1.2.8
System Control Unit (SCU)
The System Control Unit supports all central control tasks and all product specific features. The following typical sub-modules are implemented in this unit: Reset Control The reset function is controlled by the reset control unit.
1)
Debugger refers to the tool connected to the emulator, and more specifically to the OCDS via the JTAG and which manages the emulation/debugging task.
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Introduction Power Saving Control The Power Saving Control block, known from the power management of the C166 derivatives, manages idle mode, power down mode, and sleep mode of the C166S V2. ID Control A set of six identification registers is defined for the most important silicon parameters, including the chip manufacturer, the chip type and its properties. These ID registers can be used for automatic test selection. External Interrupt Control The C166S V2 System provides asynchronous fast external interrupt inputs. Central System Control The central system behavior of the C166S V2 is controlled by this block. The frequency of the PDBUS+ (bus clock) and of all peripherals connected to this bus is programmable according to the maximum physical bus speed and the application requirements. Furthermore, the clock generation status is indicated. Depending on the application state, various security levels (such as protected and unprotected mode) are supported by the security level control state machine. Watchdog Timer (WDT) The Watchdog Timer is one of the fail-safe mechanisms that have been implemented to prevent the controller from malfunctioning. However, the Watchdog Timer can detect only long term malfunctions.
1.2.9
Clock Generation Unit (CGU)
The C166S V2 Clock Generation Unit uses either an oscillator or crystal to generate the system clock. A programmable on-chip PLL adds high flexibility to clock generation for the C166S V2.
1.2.10
On-Chip Bootstrap Loader
As in the C166, the on-chip bootstrap loader allows the start code to be moved into internal RAM via the serial interface.
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Central Processing Unit
2
Central Processing Unit
C166S V2 CPU represents the third generation of the well known C166 core family. It combines many powerful enhancements with compatibility to the C166 family. The new architecture results in high CPU performance, fast and efficient access to different kinds of memories, and proficient peripheral units integration.
.
System-Bus Internal Program Memory PMU
data out address data in
CPU
Prefetch Unit Branch Unit FIFO CSP IP CPUCON1 CPUCON2 CPUID Return Stack VECSEG TFR
2-Stage Prefetch Pipeline 5-Stage Pipeline
DPRAM
IFU
Injection/Exception Handler SPSEG SP STKOV STKUN CP
IPIP
address
IDX0 IDX1 QX0 QX1
QR0 QR1
DPP0 DPP1 DPP2 DPP3
+/-
+/MRW MCW MSW MAL
ADU
Division Unit Bit-Mask-Gen. Multiply Unit Barrel-Shifter
R15 R15 R14 R15 R14 R14 GPRs GPRs GPRs R1 R1 R0 R1 R0 R0
R15 R14 GPRs
Multiply Unit +/MAH
MDC PSW MDH ZEROS +/MDL ONES
R1 R0
RF
data in
MAC
address data out data in
ALU
data in
Buffer
WB
data out
address data out
SRAM
DMU Peripheral-Bus System-Bus
Figure 2-1
CPU Architecture
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Central Processing Unit The new core architecture of the C166S V2 CPU results in higher CPU clock frequencies and reduces the number of clock cycles per executed instruction by half, compared to the C166 core. C166S V2 CPU also integrates a multiplication and accumulation unit which dramatically increases performance of the DSP-intensive tasks. C166S V2 CPU has eight main units that are listed below. All of these units have been optimized to achieve maximum performance and flexibility. * High Performance Instruction Fetch Unit (IFU) - High Bandwidth Fetch Interface - Instruction FIFO - High Performance Branch-, Call-, and Loop-Processing with instruction flow prediction * Return Stack - Injection/Exception Handler - Handling of Interrupt Requests - Handling of Hardware Failures * Instruction Pipeline (IPIP) - Bypassable 2-stage Prefetch Pipeline - 5-stage Execution Pipeline * Address and Data Unit (ADU) - 16-bit arithmetic unit for address generation - DSP address unit with a set of dedicated address- and offset pointers * Arithmetic and Logic Unit (ALU) - 8-bit and 16-bit Arithmetic Unit - 16-bit Barrel Shifter - Multiplication and Division Unit - 8-bit and 16-bit Logic Unit - Bit manipulation Unit * Multiply and ACcumulate Unit (MAC) - 16-bit multiplier with 32-bit result generation1) - 40-bit Accumulator with 40-bit Barrel Shifter - Repeat Control Unit * Register File (RF) - 5-port Register File with three independent register banks * Write Back Buffer (WB) - 3-entries buffer
1)
The same hardware-multiplier is used in the ALU and in the MAC Unit.
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Central Processing Unit
2.1
Register Description Format
C166S V2 CPU contains a set of Special Function Register (SFR) and Extended Special Function Registers (ESFR). They are described in the respective chapter of this manual. The example below shows how to interpret the format and notation used to describe SFRs and ESFRs. A word register looks like this: REG_NAME Short Description
15
0
SFR(b)/ESFR(b)/XSFR
11
0
Reset Value: aaaaH
5 4
0
14
0
13
0
12
0
10
0
9
8
7 bitfield A rwh
6
3
0
2 bit C rw
1 bit B rw
0 bit A rwh
r
r
r
r
r
r
r
r
A byte register looks like this: REG_NAME Short Description
7
0
SFR(b)/ESFR(b)/XSFR
5 bitfield A rwh 4 3
0
Reset Value: aaH
2 bit C rw 1 bit B rw 0 bit A rwh
6
r
r
Field bitfieldX
Bits [m:n]
Type Description type Description value Function off(Default) value Enable Function 1 ... ... Description 0 Function off(Default) 1 Enable Function
bitX
[n]
type
Elements: REG_NAME bitX bitfieldX A16 / A8 SFR(b)/ESFR(b) XSFR Name of this register Name of bit Name of bitfield Long 16-bit address/Short 8-bit address Register space (SFR or ESFR (bit addressable) Register) Register located in the internal 4 k IO area
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Central Processing Unit (* *) * * Register contents after reset '0/1' : defined value, 'U' : unchanged (undefined ('X') after power up) '?' : defined by reset configuration Bit number n : Bit number first bit of the bitfield m : Bit number of last bit of the bitfield 'r' 'w' 'h' '0/1' 'X' '0' : readable by software : writable by software : writable by hardware : defined value, : undefined, : reserved for future purpose, read access delivers 0, must not be set to 1
[n] [m:n] type
value
2.2
CPU Special Function Registers
The core CPU requires a set of CPU Special Function Registers (CSFRs) to maintain the system state information, to control system and bus configuration, and to manage code memory segmentation and data memory paging. The CPU also uses CSFRs to access the General Purpose Registers (GPRs) and the System Stack, to supply the ALU with register-addressable constants, and to support multiply and divide ALU operations. The access mechanism for these CSFRs in the CPU core is identical to the access mechanism for any other SFR. Since all SFRs can be controlled by any instruction capable of addressing the SFR/CSFR memory space, there is no need for special system control instructions. However, to ensure proper processor operations, certain restrictions on the user access to some CSFRs must be imposed. For example, the Instruction Pointer (IP) and Code Segment Pointer (CSP) cannot be accessed directly at all. They can only be changed indirectly via branch instructions. The PSW, SP, and MDC registers can be modified not only explicitly by the programmer, but also implicitly by the CPU during normal instruction processing. Note: Note that any explicit write request (via software) to an CSFR supersedes a simultaneous modification by hardware of the same register. Note: All SFRs may be accessed wordwise, or bytewise (some of them even bitwise). Reading bytes from word SFRs is a non-critical operation. Any write operation to a single byte of an CSFR clears the non-addressed complementary byte within the specified CSFR. Non-implemented (reserved) CSFR bits cannot be modified, and will always supply a read value of 0.
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Central Processing Unit
2.3
Instruction Fetch and Program Flow Control
The Instruction Fetch Unit (IFU) pre-fetches and pre-processes instructions to provide a continuous instruction flow. The IFU can fetch simultaneously at least two instructions via a 64-bit wide bus from the Program Management Unit (PMU). The pre-fetched instructions are stored in an instruction FIFO. Pre-processing of branch instructions enables the instruction flow to be predicted. While the CPU is in the process of executing an instruction fetched from the FIFO, the pre-fetcher of the IFU starts to fetch a new instruction at a predicted target address from the PMU. The latency time of this access is hidden by the execution of the instructions which have been buffered in the FIFO before. Even for a non-sequential instruction, execution the IFU can generally provide a continuous instruction flow. The IFU contains two pipeline stages: the Prefetch Stage and the Fetch Stage.
24-bit address
IFU Control
CSP IP
IFU Pipeline
Instruction Buffer(up to 6 Instr.)
Branch Detection and Prediction Logic Return Stack Instruction Buffer(up to 3 Instr.) CPUCON1 CPUCON2 CPUID Control Registers Instruction FIFO Bypass Fetch to Decode Branch Folding Unit Bypass Prefetch to Decode
Injection and Exception Handler VECSEG TFR Instruction Buffer(up to 1 Instr.)
Figure 2-2
IFU Block Diagram
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Decode Stage
Fetch Stage
Prefetch Stage
+/-
64bit data
User Manual C166S V2
Central Processing Unit During the pre-fetch stage, the Branch Detection and Prediction Logic analyzes up to three pre-fetched instructions stored in the first Instruction Buffer (up to six instructions). If a branch is detected, then the IFU starts to fetch the next instructions from the PMU according to the prediction rules. After having been analyzed, up to three instructions are stored in the second Instruction Buffer (three instructions) which is the input register of the Fetch Stage. On the Fetch Stage, the pre-fetched instructions are stored in the instruction FIFO. The Branch Folding Unit (BFU) allows processing of branch instructions in parallel with preceding instructions. To achieve this the BFU pre-processes and re-formats the branch instruction. First, BFU defines (calculates) the absolute target address. This address--after being combined with branch condition and branch attribute bits--is stored in the same FIFO step as the preceding instruction. The target address is also used to pre-fetch the next instructions. For the Execution Pipeline, both instructions are fetched from the FIFO again and are executed in parallel. If the instruction flow was predicted incorrectly (or FIFO is empty), the two stages of the IFU can be bypassed. Note: Pipeline behavior in case of a incorrectly predicted instruction flow is described in the following sections.
2.3.1
Branch Target Addressing Modes
The target address and the segment of jump or call instructions can be specified by several addressing modes. The Instruction Pointer register (IP) may be updated using relative, absolute, or indirect modes. The Code Segment Pointer register (CSP) can be updated using an absolute value only. A special mode is provided to address the interrupt and trap jump vector table which resides in the lowest portion of the code segment selected by the VECSEG register contents. Table 2-1 Branch Target Addressing Modes Target Segment (CSP) = seg = 0000H + VECSC*trap7 (CSP) = VECSEG Valid Address Range caddr = 0000H...FFFEH rel rel seg = 00H...7FH = 80H...FFH = 0...255(3)
Mnemonic Target Address caddr rel [Rw] seg #trap7 (IP) (IP) (IP) (IP) (IP) = caddr = (IP) + 2*rel = (IP) + 2*(rel+1) = (Rw)
Rw w = 0...15 trap7 = 00H...7FH
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Central Processing Unit caddr: Specifies an absolute 16-bit code address within the current segment. Branches MAY NOT be taken to odd code addresses. Therefore, the least significant bit of 'caddr' is not used. This mnemonic represents an 8-bit signed word offset address relative to the current Instruction Pointer contents, which points to the instruction after the branch instruction. Depending on the offset address range, both forward ('rel'= 00H to 7FH) and backward ('rel'= 80H to FFH) branches are possible. The branch instruction itself is repeatedly executed, when 'rel' = '-1' (FFH) for a word-sized branch instruction, or 'rel' = '-2' (FEH) for a double-word-sized branch instruction. In this case, the 16-bit branch target instruction address is determined indirectly by the contents of a word GPR. In contrast to indirect data addresses, indirectly specified code addresses are NOT calculated via additional pointer registers (eg. DPP registers). Branches MAY NOT be taken to odd code addresses. Therefore, the least significant bit of 'caddr' is not used. Specifies an absolute code segment number. The C166S V2 CPU supports 256 different code segments, so only the eight lower bits (respectively) of the 'seg' operand value are used to update the CSP register.
rel:
[Rw]:
seg:
#trap7: Specifies a particular interrupt or trap number for branching to the corresponding interrupt or trap service routine via a jump vector table. Trap numbers from 00H to 7FH can be specified to access any double word code location within the address range xx'0000H...xx'15D4H (depending of VECSC) in the selected code segment (see VECSEG, i.e. the interrupt jump vector table), please refer to Section 5.1.4.
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Central Processing Unit
2.3.2
Branch Detection and Branch Prediction
The Branch Detection Unit pre-processes instructions and classifies detected branches. Depending on the branch class, the Branch Prediction Unit predicts the program flow using the rules in the following table:. Table 2-2 Branch Target Addressing Modes Instructions JMPA- xcc,caddr JMPA+ xcc,caddr CALLA- xcc, caddr CALLA+ xcc,caddr Prediction The User can specify whether the branch should be taken
Instruction Classes Branch instructions with user programmable branch prediction
Branch instructions with branch JMPA xcc,caddr prediction defined by Assembler CALLA xcc, caddr Inter-segment branch instructions Indirect branch instructions Relative branches instructions with condition code Relative branch instructions without condition code Branch instructions with bitcondition JMPS seg, caddr CALLS seg,caddr JMPI cc,[Rw] CALLI cc,[Rw] JMPR cc,rel
Assembler defines whether the branch should be taken based on the jump condition. The branch is always taken. The branch is taken only if the branch is unconditional. The branch is taken if it is unconditional or if the branch is a backward branch. The branch is always taken. The branch is taken if it is a backward branch. Forward branches are always not taken. The branch is always taken.
CALLR rel JB bitaddr,rel JBC bitaddr,rel JNB bitaddr,rel JNBS bitaddr,rel RET RETS RETP RETI
Return instructions
Note: For JMPA+/- and CALLA+/- instructions, a static user programmable prediction scheme is used. If bit 8 ('a') of the instruction long word is cleared, the branch is assumed `taken.' If it is set, the branch is assumed `not taken'. The user controls value of bit 8 by entering '+' or '-' in the instruction mnemonics. This bit can be also set/cleared by the Assembler for JMPA and CALLA instructions depending on the jump condition.
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Central Processing Unit Note: For JMPA instruction, a pre-fetch hint bit is used (the instruction bit 9 = l). This bit is required by the fetch unit to deal efficiently with short backward loops. It must be set if 0 < IP_jmpa - IP_target <= 32, where IP_jmpa is the address of the JMPA instruction and IP_target is the target address of the JMPA. Otherwise, bit 9 must be cleared.
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Central Processing Unit
2.3.3
Sequential and Mispredicted Instruction Flow
Because passing through one pipeline stage takes at least one clock cycle, any isolated instruction takes at least five clock cycles to be completed. Pipelining, however, allows parallel (i.e. simultaneous) processing of up to five instructions (with branches up to six instructions). Therefore, most of the instructions appear to be processed during one clock cycle as soon as the pipeline has been filled once after reset. The pipelining increases the average instruction throughput considered over a certain period of time. In this manual, any execution time specification always refers to the average instruction execution time due to pipelined parallel processing.
2.3.3.1
Correctly Predicted Instruction Flow
Figure 2-3 and Figure 2-4 show the continuous execution of instructions in principal under the assumption of a fast (0 wait states) Program Memory. In this example, most of the instructions are executed in one CPU cycle while Instruction In+6 takes two CPU cycles for the execution. In+6 is a general example for multicycle instructions (two cycles instruction in this case). The instructions are fetched from the Instruction FIFO while the IFU pre-fetches the next instructions to fill the FIFO. The Instruction FIFO is being filled with new instructions while the previously stored instructions are being fetched from the FIFO to be executed in the CPU. As long as the instruction flow is correctly predicted by the IFU, both processes are independent.
I
In+21 In+19 In+16 In+14 In+11 In+9
In+21 In+18 In+15 In+13 In+11 In+8
In+20 In+17 In+15 In+12 In+10 In+7
In+20 In+16 In+14 In+12 In+10 In+6
Ia+40 Ia+32 Ia+24 Ia+16 Ia+8 Ia
Figure 2-3
Program Memory Contents for Figure 2-4
The diagram shows the sequential instruction flow through the different pipeline stages. While the Prefetcher is prefetching the instruction from the PMU, the processing pipeline is filled with instructions fetched out of the FIFO. In this example with a fast Internal Program Memory, the Prefetcher is able to fetch more instructions than the processing pipeline can execute. In Tn+4, the FIFO and prefetch buffer are filled and no further
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Central Processing Unit instructions can be prefetched. The PMU address stays stable (Tn+4) until a whole 64-bit double word can be buffered (Tn+7) in the 96-bit Prefetch buffer again.
Tn PMU Address Ia+16 PMU Data 64bit Id+1 PREFETCH 96 bit Buffer FETCH Instruction Buffer FIFO contents In+6 ... In+9 In+5
Tn+1 Ia+24 Id+2 In+9 ... In+11 In+6 In+7 In+8 In+4 ... In+8 In+5 In+4 In+3 In+2 In+1 In
Tn+2 Ia+32 Id+3 In+12 In+13 In+9 In+10 In+11 In+5 ... In+11 In+6 In+5 In+4 In+3 In+2 In+1
Tn+3 Ia+40 Id+4 In+14 In+15 In+12 In+13 In+6 ... In+13 In+7 In+6 In+5 In+4 In+3 In+2
Tn+4 Ia+40 Id+5 In+15 ... In+19 In+14
Tn+5 Ia+40 Id+5 In+15 ... In+19 -
Tn+6 Ia+40 Id+5 In+16 ... In+19 In+15
Tn+7 Ia+48 Id+5 In+17 ... In+19 In+16
Tn+8 Ia+48 Id+7 In+18 ... In+21 In+17
In+3 ... In+5
In+7 ... In+14 In+7 In+6 In+6 In+5 In+4 In+3
In+7 ... In+14 In+8 In+7 In+6 In+6 In+5 In+4
In+8 ... In+15 In+9 In+8 In+7 In+6 In+6 In+5
In+9 ... In+16 In+10 In+9 In+8 In+7 In+6 In+6
In+10 ... In+17 In+11 In+10 In+9 In+8 In+7 In+6
Fetch from FIFO In+4 DECODE ADDRESS MEMORY EXECUTE WRITE BACK Figure 2-4 In+3 In+2 In+1 In
Sequential Instruction Execution
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2.3.3.2
Incorrectly Predicted Instruction Flow
If the CPU detects that the IFU made an incorrect prediction of the instruction flow, then the pipeline stages and the Instruction FIFO containing the wrong prefetched instructions are canceled. The entire instruction fetch must be restarted at the correct point of the program. Figure 2-5 and Figure 2-6 show the behavior in the case of incorrectly predicted instruction flow (0- wait states Internal Program Memory). During the cycle Tn, the CPU detects an incorrectly prediction case which leads to a canceling of the pipeline. The new address is transferred to the PMU in Tn+1 which delivers the first data in the next cycle Tn+2. But, the target instruction crosses the 64-bit memory boundary and a second fetch in Tn+3 is required to get the entire 32-bit instruction. In Tn+4, the Prefetch Buffer contains two 32-bit instructions while the first instruction Im is directly forwarded to the Decode stage.
64-bit wide Program Memory with four 16 bit packages
I... I... Im+4 Im+2 Im Im+5 Im+3 Im+1 I... Im+5 Im+3 Im+1 I... Im+4 Im+2 Im Ia+24 Ia+16 Ia+8 Ia
Figure 2-5
Program Memory Contents for Figure 2-6
The prefetcher is now restarted and prefetches further instructions. In Tn+5, the instruction Im+1 is forwarded from the Fetch Instruction Buffer directly to the Decode stage as well. The Fetch row shows all instructions in the Fetch Instruction Buffer and the instructions fetched from the Instruction FIFO. The instruction Im+3 is the first instruction fetched from the FIFO during Tn+6. During the same cycle, instruction Im+2 was still forwarded from the Fetch Instruction Buffer to the Decode stage.
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Central Processing Unit
Tn PMU Address I... PMU Data 64bit I... PREFETCH 96-bit Buffer FETCH Instruction Buffer Fetch from FIFO DECODE ADDRESS MEMORY EXECUTE WRITE BACK Figure 2-6 Inext+1 Inext Ibranch In I... Inext+2
Tn+1 Ia
Tn+2 Ia+8 Id
Tn+3 Ia+16 Id+1
Tn+4 Ia+24 Id+2 Im Im+1
Tn+5 I... Id+3 Im+2 Im+3 Im+1
Tn+6 I... I... Im+4 Im+5 Im+2 Im+3 Im+3
Tn+7 I... I... I... Im+4 Im+5 Im+4 Im+3 Im+2 Im+1 Im
Tn+8 I... I... I... I...
Im+5 Im+4 Im+3 Im+2 Im+1 Im
Im
Im+1 Im
Im+2 Im+1 Im
Ibranch In Ibranch
Incorrectly Predicted Instruction Flow
2.3.4
Atomic and Extend Instructions
The atomic and extend instructions (ATOMIC, EXTR, EXTP, EXTS, EXTPR, EXTSR) disable the standard and PEC interrupts and class A traps until completion of the immediately following sequence of instructions. The number of instructions in the sequence may vary from 1 to 4. It is coded in the 2-bit constant field #irang2 and takes values from 0 to 3. The EXTended instructions additionally change the addressing mechanism during this sequence (see instruction description). ATOMIC and EXTended instructions become active immediately, so no additional NOPs are required. All instructions requiring multi cycles or hold states for execution are considered to be one instruction. The ATOMIC and EXTended instructions can be used with any instruction type. Note: If a class B trap interrupt occurs during an ATOMIC or EXTended sequence, then the sequence is terminated, an interrupt lock is removed, and the standard condition is restored before the trap routine is executed. The remaining instructions of the terminated sequence executed after returning from the trap routine will run under standard conditions. Note: Certain precautions are required when using nested ATOMIC and EXTended instructions. There is only one counter to control the length of the sequence, i.e.
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Central Processing Unit issuing an ATOMIC or EXTended instruction within a sequence will reload the counter with the value of the new instruction.
2.3.5
Code Addressing via Code Segment and Instruction Pointer
The C166S V2 CPU provides a total addressable memory space of 16 MBytes. This address space is arranged as 256 segments of 64 Kilobytes each. A dedicated 24-bit code address pointer is used to access the memories for instruction fetches. This pointer has two parts: an 8-bit code segment pointer CSP and a 16-bit offset pointer called Instruction Pointer (IP). The concatenation of the CSP and IP results directly in a correct 24-bit physical memory address.
Memory organized in segments
255 254 FF'0000H FE'0000H
15
87
CSP
0
15
IP
0
1 0
23
01'0000H 00'0000H
segment
16 15
offset
0
Figure 2-7
Addressing via the Code Segment- and Instruction Pointer
The Instruction Pointer IP This register determines the 16-bit intra-segment address of the currently fetched instruction within the code segment selected by the CSP register. The IP register is not mapped into the C166S V2 CPU's address space, and thus it is not directly accessible by the programmer. The IP can be modified indirectly via the stack by return instructions. The IP register is implicitly updated by the C166S V2 CPU for branch instructions and after instruction fetch operations. IP Instruction Pointer
15 14 13 12 11 10
(not addressable)
9 8 IP h 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 -
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Central Processing Unit Field IP Bits [15:1] Type Description h Specifies the intra segment offset from which the current instruction is to be fetched. IP refers to the current segment . IP is always word-aligned
0
[0]
-
The Code Segment Pointer CSP This non-bit addressable register selects the code segment being used at run-time to access instructions. The lower 8 bits of register CSP select one of up 256 segments of 64 Kilobytes each, while the higher 8 bits are reserved for future use. The reset value is specified by the contents of the VECSEG register (Section 5.1.4). CSP Code Segment Pointer
15
0
SFR
10
0
Reset Value: 0000H
6 5 4 3 2 1 0
14
0
13
0
12
0
11
0
9
0
8
0
7
SEGNR rh
r
r
r
r
r
r
r
r
Field SEGNR
Bits [7:0]
Type Description rh Specifies the code segment from which the current instruction is to be fetched.
The actual code memory address is generated by direct extension of the 16-bit contents of the IP register by the lower byte of the CSP register as shown in the figure below. The CSP register can be only read and may not be written by data operations. There are two modes: segmented and non-segmented. The mode is selected with the SGTDIS bit in the CPUCON1 register. After reset, the segmented mode is selected. CPUCON1 CPU Control Register 1
15
0
SFR
10
0
Reset Value: 0000H
6 5 4 3 2 1
BP
14
0
13
0
12
0
11
0
9
0
8
0
7
0
0
ZCJ
VECSC
WDT SGT INT CTL DIS SCXT
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
Note: For a summary of the CPUCON1 register, please refer to Section 2.3.6.
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Central Processing Unit Field SGTDIS Bits [3] Type Description rw Segmentation Disable/Enable Control 0 Segmentation enabled 1 Segmentation disabled
Segmented Mode The CSP is modified either directly by the JMPS and CALLS instructions, or indirectly via the stack by the RETS and RETI instructions. Upon the acceptance of an interrupt or the execution of a software TRAP instruction, the CSP register is automatically loaded with the segment address of the vector location. Non-Segmented Mode In non-segmented mode, the CSP is fixed to the CSP value of the instruction that disabled the segmentation. It is no longer possible to modify the CSP either directly by the JMPS or CALLS instructions or indirectly via the stack by the RETS (RETI) instruction. In case of interrupt processing or a software TRAP instruction, the CSP register is automatically loaded with the segment address of the vector location (VECSEG). Note: For the correct execution of interrupt tasks, the contents of VECSEG must be the same as the segment selected by the current value of CSP, i.e. the vector table must be located in the segment pointed by the CSP. Note: For Single Chip Mode, the contents of the CSP register are significant for internal Program Memories accesses.
2.3.6 2.3.6.1
IFU Control Registers
The CPU Configuration Register CPUCON1
This register is used to configure the C166S V2 CPU. Most bits of this register enable dedicated features of the Instruction Fetch Unit (IFU). CPICON1 may not exist in future product derivatives. CPUCON1 CPU Control Register 1
15
0
SFR
10
0
Reset Value: 0000H
6 5 4 3 2 1
BP
14
0
13
0
12
0
11
0
9
0
8
0
7
0
0
ZCJ
VECSC
WDT SGT INT CTL DIS SCXT
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
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Central Processing Unit Field VECSC Bits [6:5] Type Description rw Scaling factor of Vector Table 00 Space between two vectors is 2 words 01 Space between two vectors is 4 words 10 Space between two vectors is 8 words 11 Space between two vectors is 16 words Configuration of Watch Dog Timer 0 DISWDT executable until End of Init1) 1 DISWDT/ENWDT always executable Segmentation Disable/Enable Control 0 Segmentation enabled 1 Segmentation disabled Enable Interruptibility of Switch Context 0 Switch context is not interruptible 1 Switch context is interruptible Enable Branch Prediction Unit 0 Branch prediction disabled 1 Branch prediction enabled Enable Zero Cycle Jump function 0 Zero cycle jump function disabled 1 Zero cycle jump function enabled
WDTCTL
[4]
rw
SGTDIS
[3]
rw
INTSCXT
[2]
rw
BP
[1]
rw
ZCJ
[0]
rw
1)
The DISWDT (executed after EINIT) and ENWDT instructions are internally converted in a NOP instruction
Note: Register CPUCON1 is only changeable in supervisor mode. Supervisor mode is finished by executing the EINIT instruction.
2.3.6.2
The CPU Configuration Register CPUCON2
This register is used to configure the C166S V2 CPU. It is an extension of the CPUCON1 register. This register is implemented for test purposes only in the first C166S V2 demonstration devices. This register will not be implemented in production devices. CPUCON2 CPU Control Register
15 14 13 12 11 10 9
BYP PF
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1
0
0
SL
FIFODEPTH
FIFOFED
BYP EIO OV STEN LFIC F IAEN RUN
RET FAST ST BL1)
rw
1)
rw
rw
rw
rw
rw
rw
rw
rw
rw
r
rw
reserved
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Central Processing Unit Field FIFODEPTH Bits [15:12] Type Description rw FIFO Depth configuration 0000 No FIFO (entries) 0001 One FIFO entry ... .... 1000 Eight FIFO entries 1001 reserved ... ... 1111 reserved FIFO Fed configuration 00 FIFO disabled 01 FIFO filled with up to one instruction per cycle 10 FIFO filled with up to two instructions per cycle 11 FIFO filled with up to three instruction per cycle Prefetch Bypass control 0 Bypass path from prefetch to decode disabled 1 Bypass path from prefetch to decode available Fetch Bypass control 0 Bypass path from fetch to decode disabled 1 Bypass path from fetch to decode available Early IO Injection Acknowledge Enable 0 Injection acknowledge by destructive read not guaranteed 1 Injection acknowledge by destructive read guaranteed Stall Instruction Enable 0 Stall Instruction disabled 1 Stall Instruction enabled Linear Follower Instruction Cache 0 Linear Follower Instruction Cache disabled 1 Linear Follower Instruction Cache enabled Pipeline control 0 Overrun of pipeline bubbles not allowed 1 Overrun of pipeline bubbles allowed Enable return Stack 0 Return Stack is disabled 1 Return Stack is enabled
FIFOFED
[11:10]
rw
BYPPF
[9]
rw
BYPF
[8]
rw
EIOIAEN
[7]
rw
STEN1)
[6]
rw
LFIC
[5]
rw
OVRUN
[4]
rw
RETST
[3]
rw
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Central Processing Unit Field FASTBL2) Bits [2] Type Description rw Enables the fast injection of block transfers 0 Direct injection disabled 1 Direct injection enabled Enables short loop mode 0 Short loop mode disabled 1 Short loop mode enabled
SL
[0]
rw
1)
enables dedicated stall debug instructions: STALLAM da,ha,dm,hm Opcode: 44 dahadmhm STALLEW de,he,dw,hw Opcode: 45 dehedwhw d and h are 6 bit each Stalls the corresponding pipeline stage after d cycles for h cycles. The FASTBL bit is implemented, but reserved. So do not use it. The block feature is implemented in the CPU, but not used by the Interrupt and Injection Unit.
2)
Note: Register CPUCON2 is changeable in supervisor mode only. Supervisor mode is finished by executing the EINIT instruction.
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2.4
Use of General Purpose Registers
The C166S V2 CPU uses several banks of sixteen dedicated registers R0, R1, R2... R15, called General Purpose Registers (GPR), which can be accessed in one CPU cycle. The GPRs are the working registers of the arithmetic and logic units and many also serve as address pointers for indirect addressing modes. There are several banks of GPRs which are memory mapped and two special banks which are not memory-mapped. The banks of the memory-mapped GPRs are located in the internal DPRAM. One bank uses a block of 16 consecutive words. A Context Pointer (CP) register determines the base address of the current selected bank. Because of the required number of access ports and access time, the GPRs located in the DPRAM cannot be accessed directly. To get the required performance, the GPRs are cached in a 5-port register file for high speed GPR accesses.
Core-RAM
global
Registerfile
local
AGU Write Port ALU Write Port
R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
CP
R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
R15 R15 R14 R14 R13 R13 R12 R12 R11 R11 R10 R10 R9 R9 R8 R8 R7 R7 R6 R6 R5 R5 R4 R4 R3 R3 R2 R2 R1 R1 R0 R0
Me mo ry
ma pp ed
GP R
Ba nk
AGU Read Port ALU Read Port 1 ALU Read Port 2
Figure 2-8
Register File
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Central Processing Unit The register file is split into three independent physical register banks. Because of behavior differences, the banks can be distinguished as global and local register banks. There are two local and one global register bank. The memory-mapped GPR bank selected by the current CP is always cached in the global register bank. Only one memory-mapped GPR bank can be cached at the time. In the case of a context switch, the cache contents must be sequentially saved and restored. Note: The global register bank is the equivalent of the memory-mapped GPR bank of the C166 family which is selected by the context pointer CP. To support a very fast context switch for time-critical tasks, two independent not memory mapped GPR banks are available. They are physically and logically located in the two special local register banks. They cannot be accessed via a 24-bit physical memory address. Only one of the three physical register banks can be activated at the same time. The bank selection is controlled by the BANK bitfield of the PSW. The BANK bitfield can be changed explicitly by any instruction which writes to the PSW, or implicitly by a RETI instruction, an interrupt or hardware trap. In case of an interrupt, the selection of the register bank is configured in the Interrupt Controller ITC. Hardware traps always use the global register bank.
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2.4.1
Memory Mapped GPR Banks and the Global Register Bank
The C166S V2 CPU uses the global register bank to cache an active memory-mapped GPR bank selected by the Context Pointer (CP). The CP register value determines the address of the first General Purpose Register (GPR) within the DPRAM of up to 16 wordwide and/or bytewide GPRs and selects the memory area which is automatically cached in the global register bank.
Internal DPRAM
15 16-Bit Context Pointer
0
R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
(CP)+30 (CP)+28
R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
(CP)+2 (CP)
global
local Register File
Figure 2-9
Register Bank Selection via Register CP
The General Purpose Registers of a global register bank are memory-mapped. The behavior is identical with a cache in which the CP is used as a tag. If the global register bank is activated, the cache will be validated before further instructions are executed. After validation, all further accesses to the GPRs are redirected to the global register bank. If the global register bank is activated, there are three possible ways to access the global register bank: Short 4-Bit GPR Addresses (mnemonic: Rw or Rb) specify addresses relative to the memory location pointed by the contents of the CP register, i.e. the base of contents of the current global register bank. Both byte and word GPR accesses are possible. The short 4-bit GPR address is logically added to the contents of register CP in the case a byte (Rb) GPR address is specified, or multiplied by two and then added to CP; in case of a word (Rw) GPR address (see figure below). Note: If GPRs are used as indirect address pointers, they are always accessed wordwise.
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Central Processing Unit For some instructions, only the first four GPRs can be used as indirect address pointers. These GPRs are specified via short 2-bit GPR addresses. The respective physical address calculation is identical with the one for the short 4-bit GPR addresses. Short 8-Bit Register Addresses (mnemonic: reg or bitoff) within a range from F0H to FFH interpret the four least significant bits as short 4-bit GPR addresses, while the four most significant bits are ignored. The respective physical GPR address is calculated similar to the short 4-bit GPR addresses. For single bit GPR accesses, the GPR's word address is calculated in the same way. The accessed bit position within the word is specified by a separate additional 4-bit value.
Specified by reg or bitoff 12-Bit Context Pointer
11 10
1 1 1 1 4-Bit GPR address Internal DPRAM
For byte GPR *1 accesses
*2
For word GPR accesses
+ Must be within the internal DPRAM area GPRs
Figure 2-10 Implicit CP Use by logical Short GPR Addressing Modes
.
24-Bit Memory Addresses can be directly used to access GPRs. In this case, the CPU immediately starts the memory access. At the same time, a hit detection logic checks if the accessed memory location is cached in the global register bank. In case of a cache hit, an additional global register bank read access is initiated. The data that is read from cache will be used and the data that is read from memory will be discarded. This leads to a delay of one CPU cycle (MOV R4,mem [CP<=mem<=CP+31]). In case of memory write access, the hit detection logic determines a cache hit in advance. Nevertheless, the address conversion needs one additional CPU cycle. The value is directly written into the global register bank without further delay (MOV mem,R4). Note: The 24-bit GPR addressing mode is not recommended because it requires an extra cycle for the read and write access.
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Central Processing Unit . Table 2-3 Addressing Modes to Access Word-GPRs Reset Value UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH
4-Bit Description Name Physical 8-Bit Address Address Address
1)
R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15
1)
(CP)+0 (CP)+2 (CP)+4 (CP)+6 (CP)+8
F0H F1H F2H F3H F4H
0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh Ch Dh Eh Fh
General Purpose Word Register R0 General Purpose Word Register R1 General Purpose Word Register R2 General Purpose Word Register R3 General Purpose Word Register R4 General Purpose Word Register R5 General Purpose Word Register R6 General Purpose Word Register R7 General Purpose Word Register R8 General Purpose Word Register R9
(CP)+10 F5H (CP)+12 F6H (CP)+14 F7H (CP)+16 F8H (CP)+18 F9H (CP)+20 FAH (CP)+22 FBH (CP)+24 FCH (CP)+26 FDH (CP)+28 FEH (CP)+30 FFH
General Purpose Word Register R10 UUUUH General Purpose Word Register R11 UUUUH General Purpose Word Register R12 UUUUH General Purpose Word Register R13 UUUUH General Purpose Word Register R14 UUUUH General Purpose Word Register R15 UUUUH
Addressing mode only usable if the GPR bank is memory mapped.
Note: The first 8 GPRs (R7...R0) may also be accessed bytewise. Note: Writing to a GPR byte does not affect the other byte of the respective GPR.
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Central Processing Unit The respective halves of the byte-accessible registers have special names (see Table 2-4). . Table 2-4 Addressing modes to access Byte-GPRs Reset Value UUH UUH UUH UUH UUH UUH UUH UUH UUH UUH
Name Physical 8-Bit 4-Bit Description Address Address Address
1)
RL0 RH0 RL1 RH1 RL2 RH2 RL3 RH3 RL4 RH4 RL5 RH5 RL6 RH6 RL7 RH7
1)
(CP)+0 (CP)+1 (CP)+2 (CP)+3 (CP)+4 (CP)+5 (CP)+6 (CP)+7 (CP)+8 (CP)+9
F0H F1H F2H F3H F4H F5H F6H F7H F8H F9H
0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh Ch Dh Eh Fh
General Purpose Byte Register RL0 General Purpose Byte Register RL1 General Purpose Byte Register RL2 General Purpose Byte Register RL3 General Purpose Byte Register RL4 General Purpose Byte Register RL5 General Purpose Byte Register RL6 General Purpose Byte Register RL7 General Purpose Byte Register RL8 General Purpose Byte Register RL9
(CP)+10 FAH (CP)+11 FBH (CP)+12 FCH (CP)+13 FDH (CP)+14 FEH (CP)+15 FFH
General Purpose Byte Register RL10 UUH General Purpose Byte Register RL11 UUH General Purpose Byte Register RL12 UUH General Purpose Byte Register RL13 UUH General Purpose Byte Register RL14 UUH General Purpose Byte Register RL15 UUH
Addressing mode only usable if the GPR bank is memory mapped.
Note: Even if the local register bank is selected by BANK, an old memory-mapped GPR bank can be cached in the global register bank. Memory accesses are still redirected in case of a cache hit.
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2.4.2
Local Register Bank
C166S V2 CPU has two local register banks with sixteen independent GPRs each. Both local register banks are not memory mapped. After a switch to a local register bank, the GPRs are directly accessible. There are two different ways to access an activated local register bank. Short 4-Bit GPR Addresses (mnemonic: Rw or Rb) specify addresses in the local register banks. The local register bank is selected by the BANK bitfield of the PSW. Depending on whether a relative word (Rw) or byte (Rb) GPR address is specified, the short 4-bit GPR address is either multiplied by two or not before it is used to physically access the local register bank. Thus, both byte and word GPR accesses are possible in this way. Note: If GPRs are used as indirect address pointers, they are always accessed wordwise. For some instructions, only the first four GPRs can be used as indirect address pointers. These GPRs are specified via short 2-bit GPR addresses. The respective physical address calculation is identical with the one for the short 4-bit GPR addresses. Short 8-Bit Register Addresses (mnemonic: reg or bitoff) within a range from F0H to FFH interpret the four least significant bits as short 4-bit GPR address, while the four most significant bits are ignored. The respective physical GPR address calculation is identical with the one for the short 4-bit GPR addresses. For single bit accesses on a GPR, the GPR's word address is calculated as just described, but the position of the bit within the word is specified by a separate additional 4-bit value. For a summary of all addressing modes usable to access GPRs, please see Table 2-3 and Table 2-4.
2.4.3
Context Switch
An interrupt service routine or a task scheduler of an operating system usually saves into the stack all the used registers and restores them before returning. The more registers a routine uses, the more time is wasted with saving and restoring. There are two ways to change a context in the C166S V2 core: * Switching the context by changing the selected register banks. * Switching the context of the global register bank by changing the context pointer CP.
2.4.3.1
Changing the selected Physical Register Bank
The switch between the three physical register banks is the fastest possible context switch. It is possible to switch between the current memory-mapped GPR bank located in the global register bank and the two not memory-mapped local register banks. The BANK bit field of the PSW register determines the selected bank.
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Central Processing Unit PSW Processor Status Word
15 14 13 12 11 IEN rw 10 HLD EN rw 9
SFRb
8 7 6 5 MUL IP rwh 4 E rwh
Reset Value: 0000H
3 Z rwh 2 V rwh 1 C rwh 0 N rwh
ILVL rwh
BANK rwh
USR1 USR0
rwh
rwh
Field BANK
Bits 9-8
Type Description rwh Reserved for register file bank selection 00 Global register bank 01 Reserved 10 Local register bank 1 11 Local register bank 2
In case of an interrupt service, the bank switch is automatically executed by updating the PSW. The Interrupt Controller (ITC) configuration decides which register bank will be selected. By executing a RETI instruction, the BANK bit field of the PSW will automatically be restored and the context will switched to the original register bank.
global Bank Execution Task A
local Bank Execution Task B
global Bank Execution Task A
Interrupt of Task B recognized
Execution of RETI
Figure 2-11 Context Switch by Changing the Physical Register Bank After a switch to a local register bank, the new bank is immediately available. After switching to the global register bank, the cached memory-mapped GPRs must be valid before any further instructions can be executed. If the global register bank is not valid at this time (in case if the context switch process has been interrupted), the cache validation process is repeated automatically. For further explanation, please refer to Section 2.4.3.2. Note: The switch between the three physical register banks of the register file can also be executed by writing to the BANK bitfield of the PSW. Because of pipeline dependencies an explicit change of the PSW must cancel the pipeline.
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2.4.3.2
Context Switching of the Global Register Bank
The contents of the global register bank are switched by changing the base address of the memory mapped GPR bank. The base address is given by the contents of the Context Pointer (CP). The Context Pointer (CP) The CP register is non-bit addressable. It can be updated via any instruction capable of modifying SFRs. CP Context Pointer
15 1 r 14 1 r 13 1 r 12 1 r 11 10 9
SFR
8 7 6 5 4
Reset Value: FC00H
3 2 1 0 0 r
CONTEXT POINTER rw
Field 1
Bits
Type Description CP always points in the internal DPRAM Modifiable Portion of register CP Specifies the (word) base address of the current memory-mapped register bank. When writing a value to register CP with bits CP[11:9] = '000', bits CP[11:10] are set to '11' by hardware. CP is always word-aligned rw
[15:12] r
CONTEXT POINTER [11:1]
0
[0]
r
Note: It is the user's responsibility that the physical GPR address specified via CP register plus the short GPR address must always be an internal DPRAM location. If this condition is not met, unexpected results may occur. Do not set CP below the internal DPRAM start address. Note: Due to the internal instruction pipeline, a write operation to the CP register stalls the instruction flow until the register file context switch is really executed. The instruction immediately following the instruction that updates CP register can use the new value of the changed CP. The C166S V2 CPU switches the complete memory-mapped GPR bank with a single instruction. After switching, the service routine executes within its own separate context. The instruction "SCXT CP, #New_Bank" pushes the value of the current context pointer (CP) into the system stack and loads CP with the immediate value "New_Bank", which selects a new register bank. The service routine may now use its "own registers". This
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Central Processing Unit memory register bank is preserved when the service routine terminates, i.e. its contents is available on the next call. Before returning from the service routine (RETI), the previous CP is simply popped from the system stack which returns the registers to the original bank. Context Pointer Updating After the CP has been update, a state machine starts to store the old contents of the global register bank and to load the new one. An instruction "SCXT CP, #New_Bank" takes two cycles. The store and load algorithm is executed in nineteen CPU cycles: the execution of the cache validation process takes sixteen cycles plus three cycles to stall an instruction execution to avoid pipeline conflicts upon the completion of the validation process. The context switch process has two phases: 1. Store phase: The contents of the global register bank is stored back into the DPRAM by executing eight injected STORE instructions. After the last STORE instruction the contents of the global register bank are invalidated. 2. Load phase: The global register bank is loaded with the new context by executing eight injected LOAD instructions. After the last LOAD instruction the contents of the global register bank are validated. The code execution is stopped until the global register bank is valid. A hardware interrupt which also uses a global register bank cannot be executed until the validation process is finished (see Figure 2-12).
global Bank Execution Task A Execution Task B Execution of SCXT CP Interrupt of Task B recognized Execution of SCXT CP global Bank Execution Task B Execution of POP CP Execution Task B global Bank Execution Task A
Register Bank validation process started finished
Register Bank validation process started finished
Execution of RETI
Register Bank validation process started finished
Figure 2-12 Validation process and hardware interrupts using a global register bank But, the validation process can be interrupted by any hardware interrupt which will work with a local register bank. After switching back to the global register bank, the validation process must be finished. The way the validation process will be restarted depends on the phase in which it has been interrupted.
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Central Processing Unit If the interrupt occurred before the load phase, the entire validation process is restarted from the very beginning. If the store phase has been completed before the interrupt, only the load phase is executed.
global Bank Execution Task A local Bank Execution Task B global Bank Execution Task A
Interrupt of Task B recognized Execution of SCXT CP
Execution of RETI
Register Bank validation process started stopped
Register Bank validation process restarted finished
Note: Validation Process and Hardware Interrupts using a Local Register Bank Note: A cache validation process of Task A can be interrupted by a Task B which uses a local register bank. Task B itself is interrupted again by an interrupt Task C which uses a global register bank again. In this case, the validation process of Task A must be finished before code of Task C can be executed. This means that the validation process of Task A does not affect the interrupt latency of Task B but the latency of Task C. If Task C would immediately interrupt Task A, the register bank validation process of Task A would be finished first. The worst case interrupt latency is identical in both cases (see Figure 2-12 and Figure 2-13). .
global Bank Execution Task A local Bank Execution Task B Interrupt of Task C recognized global Bank Execution Task C Execution of RETI local Bank Execution Task B global Bank Execution Task A
Register Bank validation process restarted finished
Interrupt of Task B recognized Execution of SCXT CP
Execution of RETI
Register Bank validation process started stopped
Figure 2-13 Validation Process and Hardware Interrupts using Local and Global Register Bank
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2.5
Data Addressing
The Address Data Unit (ADU) of the C166S V2 CPU contains two independent arithmetic units to generate, calculate, and update addresses for data accesses. The ADU performs the following major tasks: * * * * Standard Address Generation (Standard Address Generation Unit) DSP Address Generation (DSP Address Unit) Data Paging (Standard Address Unit) Stack Handling (Standard Address Unit)
The Standard Address Unit supports linear arithmetic for the indirect addressing modes and also generates the address in case of all other short and long addressing modes. The DSP Address Generation Unit contains an additional set of address pointers and offset registers which are used in conjunction with the CoXXX instructions only. The C166S V2 CPU provides a lot of powerful addressing modes for word, byte, and bit data accesses (short, long, indirect). The different addressing modes use different formats and have different scopes.
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2.5.1
Short Addressing Modes
All of these addressing modes use an implicit base offset address to specify a 24-bit physical address. Short addressing modes allow access to the GPR, SFR or bit addressable memory space: Physical Address = Base Address + * Short Address Note: is 1 for byte GPRs, is 2 for word GPRs.. Table 2-5 Short addressing modes Short Address Range Rw Rb reg reg reg reg bitoff bitoff bitoff bitoff = 0...15 = 0...15 = 00H...EFH = 00H...EFH = F0H...FFH = F0H...FFH = 00H...7FH = 80H...EFH = 80H...EFH = F0H...FFH Scope of Access GPRs(Word) GPRs(Byte) SFRs (Word, Low byte) ESFRs(Word, Low byte) GPRs(Word) GPRs(Bytes) RAM Bit word offset SFR Bit word offset ESFR Bit word offset GPR Bit word offset Any single bit
Mnemonic Physical Address Rw Rb reg (CP) + 2*Rw or local (CP) + 1*Rb or local 00'FE00H + 2*reg 00'F000H + 2*reg (CP)+2*(reg0FH) or local (CP)+1*(reg0FH) or local 00'FD00H + 2*bitoff 00'FF00H + 2*(bitoff7FH) 00'F100H + 2*(bitoff7FH) (CP) + 2*(bitoff0FH) or local
bitoff
bitaddr
Word offset as with bitoff. bitoff = 00H...FFH bitpos= 0...15 Immediate bit position.
Rw, Rb: Specifies direct access to any GPR in the currently active context (global register bank or local register bank). Both 'Rw' and 'Rb' require four bits in the instruction format.The base address of the global register bank is determined by the contents of register CP. 'Rw' specifies a 4-bit word GPR address relative to the base address (CP), while 'Rb' specifies a 4-bit byte GPR address relative to the base address (CP). In case of an active local register bank this 4 bits are used directly to address the GPR. reg: Specifies direct access to any (E)SFR or GPR in the currently active context (global or local register bank). The 'reg' value requires eight bits in the instruction format. Short 'reg' addresses in the range from 00H to EFH always specify (E)SFRs. In that case, the factor 'D' equates 2 and the base address is 00'FE00H for the standard SFR area or 00'F000H for the extended ESFR area. The `reg' accesses to the ESFR area require a preceding EXT*R instruction to switch the base address. Depending on the opcode, either the total word (for word operations) or the low byte (for byte operations) of an SFR can
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Central Processing Unit be addressed via 'reg'. Note that the high byte of an SFR cannot be accessed via the 'reg' addressing mode. Short 'reg' addresses in the range from F0H to FFH always specify GPRs. In that case, only the lower four bits of 'reg' are significant for physical address generation and, therefore, it is identical to the address generation described for the 'Rb' and 'Rw' addressing modes. bitoff: Specifies direct access to any word in the bit addressable memory space. The 'bitoff' value requires eight bits in the instruction format. Depending on the specified 'bitoff' range different base addresses are used to generate physical addresses: Short 'bitoff' addresses in the range from 00H to 7FH use 00'FD00H as a base address to specify the 128 highest internal RAM word locations in the range from 00'FD00Hh to 00'FDFEH. Short 'bitoff' addresses in the range from 80H to EFH use base address 00'FF00H to specify the internal SFR word locations in the range from 00'FF00H to 00'FFDEH or base address 00'F100H to specify the internal ESFR word locations in the range from 00'F100H to 00'F1DEH. The `bitoff' accesses to the ESFR area require a preceding EXT*R instruction to switch the base address. For short 'bitoff' addresses from F0H to FFH, only the lowest four bits are used to generate the address of the selected word GPR.
bitaddr: Any bit address is specified by a word address within the bit addressable memory space (see 'bitoff'), and by a bit position ('bitpos') within that word. Therefore, 'bitaddr' requires twelve bits in the instruction format.
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2.5.2
Long and Indirect Addressing Modes
These addressing modes use one of the four DPP registers to specify a 24-bit address. Any word or byte data within the entire address space can be accessed with these modes. Any long or indirect 16-bit address contain two parts that have different meanings. Bits 13...0 specify a 14-bit data page offset, while bits 15...14 specify the Data Page Pointer (DPP) (1 of 4) register used to generate the full 24-bit address (see Figure 2-14). The C166S V2 CPU also supports an override mechanism for the DPP addressing scheme (EXTP(R) and EXTS(R) instructions). See following sections for details.
15 14 13 0
16-bit Long Address
DPP0 DPP1 DPP2 DPP3
14-bit page offset
24-bit Physical Address Figure 2-14 Interpretation of a 16-bit Long Address
Note: Word accesses on odd byte addresses are not executed. A hardware trap will be triggered.
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2.5.2.1
Addressing via Data Page Pointer DPP
The four non-bit addressable Data Page Pointer registers select up to four different data pages. The lower 10 bits of each DPP register select one of the 1024 possible 16Kilobyte data pages while the upper 6 bits are reserved for the future use. The DPP registers provide an access to the entire memory space in 16 Kilobytes pages. The DPP registers are implicitly used whenever data accesses to any memory location are made via indirect or direct long 16-bit addressing modes (except for override accesses via EXTended instructions and PEC data transfers). Data paging is performed by concatenating the lower 14-bits of an indirect or direct long 16-bit address with the contents of the DDP register selected by the upper two bits of the 16-bit address. The contents of the selected DPP register specifies one of the 1024 possible data pages. This data page base address together with the 14-bit page offset forms the physical 24-bit address.
16-Bit Data Address
15 14 0
Memory 255 FF'0000H 254 FE'0000H 9 DPP 0 DPP3 - 11 DPP2 - 10 DPP1 - 01 DPP0 - 00
selects DPP
x
1 01'0000H 0 00'0000H Page Segment 23
15 14
0
Page offset Segment offset
Figure 2-15 Data Page Pointer Addressing After reset, the DPP registers select data pages 3...0 within segment 0. If the user does not want to use any data paging, no further action is required.
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Central Processing Unit DPP0 Data Page Pointer 0
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9
SFR
8 7 6 5 PN rw 4
Reset Value: 0000H
3 2 1 0
DPP1 Data Page Pointer 1
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9
SFR
8 7 6 5 PN rw 4
Reset Value: 0001H
3 2 1 0
DPP2 Data Page Pointer 2
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9
SFR
8 7 6 5 PN rw 4
Reset Value: 0002H
3 2 1 0
DPP3 Data Page Pointer 3
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9
SFR
8 7 6 5 PN rw 4
Reset Value: 0003H
3 2 1 0
Field PN
Bits [9:0]
Type Description rw Data Page Number of DPP Specifies the data page selected via DPP.
Note: In case of non-segmented memory mode, the entire DPP register is still used for the calculation of the physical 24-bit address. A DPP register can be updated via any instruction capable of modifying an SFR.
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Central Processing Unit Note: Due to the internal instruction pipeline, a write operation to the DPPx registers could stall the instruction flow until the DPP is actually updated. The instruction that immediately follows the instruction which updates the DPP register can use the new value of the changed DPPx.
2.5.2.2
DPP Override Mechanism in the C166S V2 CPU
The C166S V2 CPU provides an override mechanism for the temporary bypass of the DPP addressing scheme. The EXTP(R) and EXTS(R) instructions override this addressing mechanism. Instruction EXTP(R) replaces the contents of the respective DPP register, while instruction EXTS(R) concatenates the complete 16-bit long address with the specified segment base address. The overriding page or segment may be specified directly as a constant (#pag, #seg) or via a word GPR (Rw).
EXTP(R): 15 14 13 16-bit Long Address #pag 14-bit page offset 0
24-bit Physical Address
EXTS(R):
15 16-bit Long Address #seg
0
16-bit segment offset
24-bit Physical Address
Figure 2-16
Overriding the DPP Mechanism
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2.5.2.3
Long Addressing Mode
The long addressing mode uses a 16-bit constant value encoded in the instruction format which specifies the data page offset and the DPP. The long addressing mode is referred to by the mnemonic `mem'. . Table 2-6 Mnemonic mem Long Addressing Modes Physical Address (DPP0) || mem3FFFH (DPP1) || mem3FFFH (DPP2) || mem3FFFH (DPP3) || mem3FFFH pag || mem3FFFH seg || mem Scope of Access Any Word or Byte
mem mem
Any Word or Byte Any Word or Byte
Note: The long addressing may be used with the DPP overriding mechanism (EXTP(R) and EXTS(R)).
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2.5.2.4
Indirect Addressing Modes
These addressing modes can be considered as a combination of short and long addressing modes. This means that long 16-bit address is provided indirectly by the contents of a word GPR which is specified directly by a short 4-bit address ('Rw'=0 to 15). There are indirect addressing modes, which add a constant value to the GPR contents before the long 16-bit address is calculated. Other indirect addressing modes can decrement or increment the indirect address pointers (GPR contents) by 2 or 1 (referring to words or bytes) or by the contents of the offset registers QR0 and QR1. The Offset Register QR0 and QR1 There are two non-bit addressable offset registers QR0 and QR1 which can be used in conjunction with the CoXXX instructions. QR0 Offset Register
15 14 13 12 11 10 9
ESFR
8 QR rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
QR1 Offset Register
15 14 13 12 11 10 9
ESFR
8 QR rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
Field QR
Bits [15:1]
Type Description rw Modifiable portion of register QRx Specifies the 16-bit offset address for indirect addressing modes. Fixed to 0
0
[0]
r
Note: During initialization of the QR registers, instruction flow stalls are possible. For the proper operation refer to Chapter 4.1.4. In each case, one of the four DPP registers is used to specify physical 24-bit addresses. Any word or byte data within the entire memory space can be addressed indirectly. Note: The indirect addressing may be used with the DPP overriding mechanism (EXTP(R) and EXTS(R)).
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Central Processing Unit Some instructions only use the lowest four word GPRs (R3...R0) as indirect address pointers, which are specified via short 2-bit addresses in that case. Physical addresses are generated from indirect address pointers using the following algorithm: 1) Calculate the physical address of the word GPR, which is used as indirect address pointer, using the specified short address ('Rw') and - the current global register bank GPR Address = (CP) + 2 * Short Address - the current local register bank GPR Address = 2 * Short Address. 2) If required, pre-decremented indirect address pointer (`-Rw') by the data-typedependent value (D=1 for byte operations, D=2 for word operations) before the long 16-bit address is generated: (GPR Address) = (GPR Address) - D ; [optional step!] 3) Calculate the long 16-bit address by adding a constant value ('Rw+const16' if selected) to the contents of the indirect address pointer: Long Address = (GPR Pointer) + Constant ; [+Constant is optional] 4) Calculate the physical 24-bit address using the resulting long address and the corresponding DPP register contents (see long 'mem' addressing modes). Physical Address = (DPPi) + Page offset 5) - If required, post-in/decrement indirect address pointers (`Rw') by the datatype-dependent value (D=1 for byte operations, D=2 for word operations). - If required, post-in/decrement indirect address pointers (`Rw QRx') by D=QRx: (GPR Pointer) = (GPR Pointer) D ; [optional step!]
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Central Processing Unit The following indirect addressing modes are provided: . Table 2-7 Mnemonic [Rw] [Rw+] [-Rw] Indirect Addressing Modes Particularities Most instructions accept any GPR (R15...R0) as indirect address pointer. Some instructions accept only the lower four GPRs (R3...R0). The specified indirect address pointer is automatically post-incremented by 2 or 1 (for word or byte data operations) after the access. The specified indirect address pointer is automatically pre-decremented by 2 or 1 (for word or byte data operations) before the access.
[Rw+#data16] The specified 16-bit constant is added to the indirect address pointer, before the long address is calculated. [Rw-] [Rw+QRx] [Rw-QRx] The specified indirect address pointer is automatically postdecremented by 2 (word data operations) after the access. The specified indirect address pointer is automatically post-incremented by QRx (word data operations) after the access. The specified indirect address pointer is automatically postdecremented by QRX (word data operations) after the access.
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2.5.3
DSP Addressing
In addition to the Standard Address Generation Unit, the DSP Address Generation Unit provides an additional set of pointer and offset registers. An independent arithmetic unit allows the update of these dedicated pointer registers in parallel with the GPR-Pointer modification of the Standard Address Generation Unit. The DSP Address Generation Unit only supports indirect addressing modes that use the special pointer registers IDX0 and IDX1. The Pointer Register IDX0 and IDX1 The additional set of pointer registers IDX0 and IDX1 allows the execution of DSP specific CoXXX instruction in one CPU cycle. IDX0 Address Pointer
15 14 13 12 11 10 9
SFRb
8 IDX rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
IDX1 Address Pointer
15 14 13 12 11 10 9
SFRb
8 IDX rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
Field IDX
Bits [15:1]
Type Description rw Modifiable portion of register IDXx Specifies the 16-bit value of a dedicated address pointer. Fixed to 0
0
[0]
r
Note: During the initialization of the IDX registers, instruction flow stalls are possible. For the proper operation, refer to the Section 4.1.4. The address pointers can be used for arithmetic operations as well as for the special CoMOV instruction. But, the generation of the 24 bit memory address is different. In case of arithmetic CoXXX operations, the IDX pointers are automatically zero extended to a 24-bit memory address. The IDX address pointers should point to the internal DPRAM area. Even if the IDX address pointers do not point to the internal
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Central Processing Unit DPRAM area, the address is mapped into the DPRAM area. The leading four bits of the IDX pointers are not taken into account as shown in Figure 2-17.
16-Bit IDX Pointer Memory
15 12 11 0
2
02'0000H
1
01'0000H
DPRAM in Data Page 3 0
00'0000H 23 00000000 15 12 11 0
1111
Figure 2-17 Arithmetic MAC Operations and Addressing via the IDX Pointers For CoMOV MAC operation, the IDX pointers are concatenated with the Data Page Pointers, just like normal GPR-Pointers as described in Section 2.5.2.1. The IDX pointer can address the entire C166S V2 memory area without any restrictions.
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16-Bit Data Address (IDXx)
15 14 0
Memory 255 FF'0000H 254 FE'0000H 9 DPP 0 DPP3 - 11 DPP2 - 10 DPP1 - 01 DPP0 - 00
selects DPP
x
1 01'0000H 0 00'0000H Page Segment 23
15 14
0
Page offset Segment offset
Figure 2-18 CoMOV Operations and Addressing via the IDX Pointers There are indirect addressing modes which allow parallel data move operations before the long 16-bit address is calculated. Other indirect addressing modes allow decrementing or incrementing the indirect address pointers (IDXx contents) by 2 or by the contents of the offset registers. There are two non-bit addressable offset registers QX0 and QX1 which can be used in conjunction with the CoXXX instructions.
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Central Processing Unit The Offset Register QX0 and QX1 These two non-bit addressable registers are used only for CoXXX operations which access operands using indirect addressing mode. The QX offset registers are used in conjunction with the IDX pointers. QX0 Offset Register
15 14 13 12 11 10 9
ESFR
8 QX rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
QX1 Offset Register
15 14 13 12 11 10 9
ESFR
8 QX rw 7 6 5 4
Reset Value: 0000H
3 2 1 0 0 r
Field QX
Bits [15:1]
Type Description rw Modifiable portion of register QXx Specifies the 16-bit offset address for indirect addressing modes. Fixed to 0
0
[0]
r
Note: During the initialization of the QX registers, instruction flow stalls are possible. For the proper operation, refer to the Section 4.1.4. Physical addresses are generated from indirect address pointers IDX via the following algorithm: 1) 2) Determine the used IDXx pointer An intermediate long address is calculated for the parallel data move operation of CoXXXM instructions before the long 16-bit address is generated [optional step!]: - If required, indirect address pointers (`IDXx') are de/incremented by D=2. - If required, indirect address pointers (`IDXx QXx') are de/incremented by D= QXx.
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Central Processing Unit Intermediate Address = (IDXx Address) D ; [optional step!] 3) Calculate long 16-bit address: Long Address = (IDXx Pointer)
4)
Calculate the physical 24-bit address using the resulting long address and the corresponding DPP register contents (see long 'mem' addressing modes and DPPi override mechanism for arithmetic CoXXX instructions). Physical Address = (DPPi) + Page offset
5)
- If required, indirect address pointers (`IDXx') are in/decremented by D=2 for word operations. - If required, indirect address pointers (`IDXx QXx') are in/decremented by D= QXx for word operations. (IDX Pointer) = (IDX Pointer) D; [optional step!]
The following indirect addressing modes are provided: . Table 2-8 Mnemonic [IDXx] [IDXx+] with parallel data move DSP Addressing Modes Particularities Most CoXXX instructions accept IDXx (IDX0, IDX1) as an indirect address pointer. The specified indirect address pointer is automatically post-incremented by 2 after the access. In case of a CoXXXM instruction, the address stored in the specified indirect address pointer is automatically pre-decremented by 2 for the parallel move operation. The pointer itself is not pre-decremented. Then, the specified indirect address pointer is automatically postincremented by 2 after the access. The specified indirect address pointer is automatically postdecremented by 2 after the access.
[IDXx-]
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Central Processing Unit Table 2-8 Mnemonic with parallel data move DSP Addressing Modes (cont'd) Particularities In case of a CoXXXM instruction, the address stored in the specified indirect address pointer is automatically pre-incremented by 2 for the parallel move operation. The pointer itself is not pre-incremented. Then, the specified indirect address pointer is automatically post-decremented by 2 after the access. The specified indirect address pointer is automatically post-incremented by QXx after the access. In case of a CoXXXM instruction, the address stored in the specified indirect address pointer is automatically pre-decremented by QXx for the parallel move operation. The pointer itself is not pre-decremented. Then, the specified indirect address pointer is automatically postincremented by QXx after the access. The specified indirect address pointer is automatically postdecremented by QXx after the access. In case of a CoXXXM instruction, the address stored in the specified indirect address pointer is automatically pre-incremented by QXx for the parallel move operation. The pointer itself is not pre-incremented. Then, the specified indirect address pointer is automatically post-decremented by QXx after the access.
[IDXx+QXx] with parallel data move
[IDXx-QXx] with parallel data move
The example in Figure 2-19 shows the complex operation of CoXXX instructions with a parallel move operation based on the descriptions about addressing modes given in Section 2.5.2.4 (Indirect Addressing Modes) and Section 2.5.3 (DSP Addressing Modes).
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CoXXXMxx [IDX0+],[R2+]
Address operations 1) calculate pointer addresses IDXx = IDX0 2) intermediate address of write pointer for the parallel mov operation Intermediate Address = (IDX0) - 2 3) calculate long 16bit address Long Address 1 = (IDX0) R2 Address = CP + 2*2 (global register bank)
Long Address 2 = (R2)
4) calculate 24bit physical address Physical Address 1 = Page3 + Page offset Physical Address 2 = (DPPi) + Page offset 5) post modify address pointer (IDX0)new = (IDX0) + 2 Data operations 1) Read operands op1 = (Physical Address 1) op2 = (Physical Address 2)
(R2)new = (R2) + 2
2) Write operand op1 (Intermediate Address) = op1
(IDX0)new (updated pointer) op1 (IDX0) (read pointer) op2
(R2)new (updated pointer) (R2) (read pointer)
parallel move
Intermediate Address (write pointer for parallel move)
Figure 2-19 Arithmetic MAC Operations with Parallel Move
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2.5.4
The CoREG Addressing Mode
The CoSTORE instruction utilizes the special CoREG addressing mode for immediate storage of the MAC-Unit register after a MAC operation. The address of the MAC-Unit register is coded in the CoSTORE instruction format as described in the following table:
.
Table 2-9 Mnemonic MSW MAH MAS MAL MCW MRW
Coding of the CoREG Addressing Mode Register MAC-Unit Status Word MAC-Unit Accumulator High Word Coding of wwww:w bits [31:27] 00000 00001
Limited MAC-Unit Accumulator High 00010 Word MAC-Unit Accumulator Low Word MAC-Unit Control Word MAC-Unit Repeat Word 00100 00101 00110
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2.5.5
The System Stack
The C166S V2 CPU supports a system stack of 64 kBytes. The stack can be located internally in one of the on-chip memories or externally. The 16-bit Stack Pointer (SP) register addresses the stack within a 64 kByte segment. The Stack Pointer Segment Register (SPSG) selects the segment in which the stack is located. A virtual stack (usually bigger then 64 kBytes) can be implemented by software. This mechanism is supported by registers STKOV and STKUN (see descriptions below). The Stack Pointer Register SP The non-bit addressable Stack Pointer SP register is used to point to the top of the system stack (TOS). The SP register is pre-decremented whenever data is to be pushed onto the stack, and it is post-incremented whenever data is to be popped from the stack. Therefore, the system stack grows from higher toward lower memory locations. The SP register can be updated via any instruction capable of modifying an 16-bit SFR. Note: Due to the internal instruction pipeline, a stack pointer initialization stalls the instruction flow until the operation is finished. A POP and RETURN instruction can immediately follow an instruction updating the SP. SP Stack Pointer
15 14 13 12 11 10 9
SFR
8 SP rwh 7 6 5 4
Reset Value: FC00H
3 2 1 0 0 r
Field SP 0
Bits [15:1] [0]
Type Description rwh r Modifiable portion of register SP Specifies the top of the system stack. Fixed to 0
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Central Processing Unit The Stack Pointer Segment Register SPSEG This non-bit addressable register selects the segment being used at run-time to access system stack. The lower eight bits of register SPSEG select one of up 256 segments of 64-kilobytes each, while the higher 8 bits are reserved for future use. SPSEG Stack Pointer Segment
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
SFRb
8 0 r 7 6 5 4
Reset Value: 0000H
3 2 1 0
SPSEGNR rw
Field SPSEGNR
Bits [7:0]
Type Description rw Stack Pointer Segment Number Specifies the segment where the stack is located.
System stack addresses are generated by directly extending the 16-bit contents of the SP register by the contents of the SPSG register as shown in Figure 2-20. The system stack cannot cross a 64k byte segment boundary.
SPSEG
Stack Pointer Segment 255 254 FF'0000H FE'0000H 15 7 SPSEGNR 0 15 SP 0
1 0
23 01'0000H 00'0000H
16 15
0
Figure 2-20 Addressing via the Stack Pointer In case of a non-segmented memory mode, the SPSG register is also used to generate the physical address. If a non-segmented memory model is selected, extreme care should be taken when changing the contents of the SPSG register. Improper SPSG change may result in erroneous system behavior. The SPSG register can be updated via any instruction capable of modifying an SFR.
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Central Processing Unit Note: Due to the internal instruction pipeline, a write operation to the SPSG register stalls the instruction flow until the SPSG register is really updated. The instruction immediately following the instruction updating the SPSG register can use the new value. The Stack Overflow Pointer STKOV This non-bit addressable STKOV register is compared with the SP register before each implicit write operation which decrements the contents of the SP register. If the contents of the SP register are equal to the contents of the STKOV register, a stack overflow trap will occur. STKOV Stack Overflow Pointer
15 14 13 12 11 10 9
SFR
8 STKOV rw 7 6 5 4
Reset Value: FA00H
3 2 1 0 0 r
Field STKOV
Bits [15:1]
Type Description rw Modifiable portion of register STKOV Specifies the segment offset address of the lower limit of the system stack. Fixed to 0
0
[0]
r
The STKOV register can be updated via any instruction capable of modifying a SFR. Note: The Stack Pointer Segment Register SPSG is not taken into account for the stack pointer comparison. The system stack cannot cross a 64k segment. This checking mechanism is triggered before every implicit write access. The contents of the stack pointer is compared with the contents of the overflow register, whenever the SP is to be decremented either by a CALLA, CALLI, CALLR, CALLS, PCALL, TRAP, SCXT or PUSH instruction. Note: If the Stack Pointer was explicitly changed as a result of move or arithmetic instruction, SP is not compared to the contents of the STKOV. Therefore, if the modified Stack Pointer is below the limit set by STKOV register, the stack violation will not be detected. The stack overflow can be detected only if the contents of SP are equal to (not less than) the contents of the STKOV and only in case of implicit SP modification. This means that SP may be explicitly set to the value below permitted SP range and even be operated there without triggering any traps. However, if SP crosses the limit of the permitted SP range from outside the range as a result of implicit change (PUSH for example), the event (SP) = (STKOV) will
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Central Processing Unit trigger the corresponding trap. Note that event (SP) = (STKOV) resulting from an explicit SP modification does not trigger the trap. The Stack Overflow Trap is triggered when (SP) = (STKOV) and if SP is to be implicitly decremented. This trap may be used in two different ways: * Fatal error indication treats the stack overflow as a system error and executes associated trap service routine. Under these circumstances, data in the bottom of the stack may have been overwritten by the status information stacked upon servicing the stack overflow trap. * Automatic system stack flushing allows the system stack to be used as a 'Stack Cache' for a bigger external user stack. The Stack Underflow Pointer STKUN This non-bit addressable register STKUN is compared with the SP register before each implicit read operation that increments the contents of the SP register. If the contents of the SP register are equal to the contents of the STKUN register, a stack underflow hardware trap will occur. STKUN Stack Underflow Pointer
15 14 13 12 11 10 9
SFR
8 STKUN rw 7 6 5 4
Reset Value: FC00H
3 2 1 0 0 r
Field STKUN
Bits [15:1]
Type Description rw Modifiable portion of register STKUN Specifies the segment offset address of the upper limit of the system stack. Fixed to 0
0
[0]
r
The STKUN register can be updated via any instruction capable of modifying a SFR. Note: The Stack Pointer Segment Register SPSG is not taken into account for the stack pointer comparison. The system stack cannot cross a 64 k segment. This checking mechanism is triggered before each implicit read access. The contents of the stack pointer are compared to the contents of the underflow register, whenever the SP will be incremented either by a RET, RETS, RETP, RETI or POP instruction. Note: If the Stack Pointer was explicitly changed as a result of move or arithmetic instruction, SP is not compared to the contents of the STKUN register. Therefore, if the modified Stack Pointer is above the limit set by STKUN register, the stack
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Central Processing Unit violation will not be detected. The stack underflow can be detected only if the contents of SP are equal to (not higher than) the contents of the STKUN and only in case of implicit SP modification. This means that SP may be explicitly set to the value above the permitted SP range and even be operated there without triggering any traps. However, if SP crosses the limit of the permitted SP range from outside the range as a result of an implicit change (POP instruction, for example), the event (SP) = (STKUN) will trigger the corresponding trap. Note that event (SP) = (STKUN) resulting from an explicit SP modification does not trigger the trap. The Stack Underflow Trap is triggered when (SP) = (STKUN) and if SP is to be implicitly incremented. This trap may be used in two different ways: Fatal error indication treats the stack underflow as a system error and executes associated trap service routine. * Automatic system stack refilling allows use of the system stack as a 'Stack Cache' for a bigger external user stack. Scope of Stack Limit Control The stack limit control implemented by the register pair STKOV and STKUN detects cases in which the Stack Pointer (SP) crosses the defined stack area as a result of implicit change. Note: If a stack overflow or underflow event occurs in an ATOMIC/EXT sequence, the stack operations that are part of the sequence are completed. The trap is issued after the completion of the entire ATOMIC/EXT sequence.
2.6
Data Processing
All standard arithmetic, shift and logical operations are performed in the 16-bit ALU. In addition to the standard arithmetic and logic unit, the ALU of the C166S V2 CPU includes bit manipulation, multiply and divide unit. Most internal execution blocks have been optimized to perform operations on either 8-bit or 16-bit numbers. After the pipeline has been filled, most instructions are completed in one CPU cycle. The status flags are automatically updated in the PSW register after each ALU operation (see Section 2.6.6). These flags allow branching upon specific conditions. Support of both signed and unsigned arithmetic is provided by the user selectable branch test. The status flags are also preserved automatically by the CPU upon entry into an interrupt or trap routine.
2.6.1
Data Types
The C166S V2 CPU supports operations on booleans/bits, bit strings, characters, integers, and signed fraction numbers. Most instructions operate with specific data types, while others are useful for manipulating several data types.
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Central Processing Unit The C166S V2 CPU data formats are able to support all ANSI C data types. Additional to the ANSI C data types, some C-Compilers support new types that allow efficient use of the bit manipulation instructions in embedded control applications.. . Table 2-10 ANSI C Data Types Size (bytes) Range 1 bit 1 bit 1 bit 1 1 1 1 2 2 2 2 2 4 4 4 8 8 2 0 or 1 0 or 1 0 or 1 -128 to +127 0 to 255U 0 to 65535U 0 to 65535U -32768 to 32767 0 to 65535U 0 to 65535U -32768 to 32767 0 to 65535U -2147483648 to +2147483647 +/-1,176E-38 to +/-3,402E+38 +/- 2,225E-308 to +/- 1,797E+308 +/- 2,225E-308 to +/- 1,797E+308 16/14 bits depending on memory model CPU Data Format BIT BIT BIT BYTE BYTE WORD WORD WORD WORD WORD or BIT WORD WORD Not directly supported
ANSI C Data Types bit sfrbit esfrbit signed char unsigned char sfr esfr signed short unsigned short bitword signed int unsigned int signed long unsigned long float double long double near pointer
0 to 4294967295UL Not directly supported Not directly supported Not directly supported Not directly supported WORD
far pointer
4
14 bits (16 k) in any Not directly supported page
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Central Processing Unit Table 2-11 CPU Data Formats Size (bytes) Range 1 bit 1 2 0 or 1 0 to 255U or -128 to +127 0 to 65535U or -32768 to 32767
CPU Data Format BIT BYTE WORD
2.6.2
Constants
In addition to the powerful addressing modes, the C166S V2 CPU instruction set also supports the use of wordwide or bytewide immediate constants. For optimum utilization of the available code storage, these constants are represented in the instruction formats by either 3, 4, 8, or 16 bits. The short constants are always zero-extended, while the long constants are truncated if necessary, to match the data format required for the particular operation (see table below): . Table 2-12 Mnemonic #data3 #data4 #data8 #data16 #mask Constant Formats Word Operation 0000H + data3 0000H + data4 0000H + data8 data16 0000H + mask Byte Operation 00H + data3 00H + data4 data8 data16 FFH mask
Note: Immediate constants are always signified by a leading sign '#'.
2.6.3
16-bit Adder/Subtracter, Barrel Shifter, and 16-bit Logic Unit
All standard arithmetic and logical operations are performed by the 16-bit ALU. In case of byte operations, signals from bits 6 and 7 of the ALU result are used to control the condition flags. Multiple precision arithmetic is supported by a "CARRY-IN" signal to the ALU from previously calculated portions of the desired operation. A 16-bit barrel shifter provides multiple bit shifts in a single cycle. Rotations and arithmetic shifts are also supported.
2.6.4
Bit Manipulation Unit
C166S V2 CPU offers a large number of instructions for bit processing. The special bit manipulation unit was implemented for this purpose. The bit manipulation instructions enable efficient control and testing of peripherals. Unlike other microcontrollers,
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Central Processing Unit C166S V2 CPU features instructions that provide direct access to two operands in the bit addressable space without requiring them to be moved to temporary locations. The same logical instructions that are available for words and bytes can also be used for bits. The user can compare and modify a control bit for a peripheral in one instruction. Multiple bit shift instructions have been included to avoid long instruction streams of single bit shift operations. These instruction require a single CPU cycle. Additionally, bit field instructions enable are able to modify the multiple bits in one operand in a single instruction. All instructions that manipulate single bits or bit groups internally use a read-modify-write sequence that accesses the whole word containing the specified bit(s). This method has several consequences: * Bits can be modified only within the internal address areas, i.e. internal RAM and SFRs. External locations cannot be used with bit instructions. The upper 256 bytes of the SFR area, the ESFR area, and the internal RAM are bit addressable, i.e. those register bits located within the respective sections can be directly manipulated using bit instructions. The other SFRs must be accessed byte/word wise. Note: All GPRs are bit addressable independent of the allocation of the register bank via the Context Pointer (CP). Even GPRs allocated to not bit addressable RAM locations provide this feature. * The read-modify-write approach may be critical with hardware-effected bits. In such cases, the hardware may change specific bits while the read-modify-write operation is in progress, where the write back would overwrite the new bit value generated by the hardware. The solution is either the implemented hardware protection (see below) or realized through special programming (see Section 4.1). Protected bits are not changed during the read-modify-write sequence, that is, when hardware sets something like an interrupt request flag between the read and the write of the read-modify-write sequence. The hardware protection logic guarantees that only the intended bit(s) is/are effected by the write-back operation. Note: If a conflict occurs between a bit manipulation generated by hardware and an intended software access, the software access has priority and determines the final value of the respective bit.
2.6.5
Multiply and Divide Unit
The C166S V2 CPU multiply and divide unit has two separated parts. One is the fast 16x16-bit multiplier that executes a multiplication in one CPU cycle. The other one is a division sub-unit which performs the division algorithm in 21 CPU cycles maximum. According to the data and division types, the division length varies between 18 and 21 cycles. The divide instruction requires four CPU cycles to be executed. For performance reasons, the rest of the division algorithm runs in the background during the following
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Central Processing Unit seventeen CPU cycles, while further instructions are executed in parallel. If another instruction tries to use the unit while a division is still running, the execution of this new instruction is stalled until the division is finished. Interrupt tasks can also be started and executed immediately without any delay. The previous division will be finished in the background. If an instruction of the interrupt task uses the multiply and divide unit before the previous division process is finished, the instruction flow will be stalled as well. To avoid these stalls, the multiply and division unit should not be used during the first fourteen CPU cycles of the interrupt tasks. This requires up to fourteen one-cycle instructions to be executed between the interrupt entry and the first instruction which uses the multiply and divide unit again (worst case). The Multiply/Divide High Register MDH The sixteen bit, non-bit addressable MDH register contains the high word of the 32-bit multiply/divide MD register used by the CPU when it performs a multiplication or a division using implicit addressing (DIV, DIVL, DIVLU, DIVU, MUL, MULU). After an implicitly addressed multiplication, this register represents the high order sixteen bits of the 32-bit result. For long divisions, the MDH register must be loaded with the high order sixteen bits of the 32-bit dividend before the division has started. After any division, the MDH register represents the 16-bit remainder.
MDH Multiply Divide High Word
15 14 13 12 11 10 9
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
MDH rwh
Field MDH
Bits [15:0]
Type Description rwh High part of MD The high order sixteen bits of the 32-bit multiply and divide register MD.
Whenever this register is updated via software, the Multiply/Divide Register In Use (MDRIU) flag in the Multiply/Divide Control register (MDC) is set to 1. The Multiply/Divide Low Register MDL The sixteen bit, non-bit addressable MDL register contains the low word of the 32-bit multiply/divide MD register used by the CPU when it performs a multiplication or a division using implicit addressing (DIV, DIVL, DIVLU, DIVU, MUL, MULU). After a
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Central Processing Unit multiplication, this register represents the low order sixteen bits of the 32-bit result. For long divisions, the MDL register must be loaded with the low order sixteen bits of the 32-bit dividend before the division has started. After any division, the MDL register represents the 16-bit quotient. MDL Multiply Divide Low Word
15 14 13 12 11 10 9
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
MDL rwh
Field MDL
Bits [15:0]
Type Description rwh Low part of MD The low order 16 bits of the 32-bit multiply and divide register MD.
Whenever this register is updated via software, the Multiply/Divide Register In Use (MDRIU) flag in the Multiply/Divide Control register (MDC) is set to 1. The MDRIU flag is cleared whenever the MDL register is read via software.
The Divide Control Register MDC This bit addressable 16-bit register is implicitly used by the CPU when it performs a division or multiplication in the ALU. MDC Multiply Divide Control
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
SFRb
8 0 r 7 0 r 6 0 r 5 0 r 4 MDR IU rwh
Reset Value: 0000H
3 0 r 2 0 r 1 0 r 0 0 r
Field MDRIU
Bits [4]
Type Description rwh Multiply/Divide Register In Use 0: Cleared when MDL is read via software. 1: Set when MDL or MDH is written via software, or when a multiply or divide instruction is executed.
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Central Processing Unit The MDRIU flag is the only portion of the MDC register used for multiplication and division within the C166S V2 CPU. This bit indicates the usage of the MDL and MDH register. It must be stored prior to a new multiplication or division operation. The remaining portions of the MDC register are never used by the dedicated multiplication and division hardware.
2.6.6
The Processor Status Word PSW
This bit addressable register reflects the current status of the microcontroller. Two groups of bits represent the current ALU status and the current CPU interrupt status. Two separate bits (USR0 and USR1) within register PSW are provided as general purpose flags. PSW Processor Status Word
15 14 13 12 11 IEN rw 10 HLD EN rw 9
SFRb
8 7 6 5 4 E rwh
Reset Value: 0000H
3 Z rwh 2 V rwh 1 C rwh 0 N rwh
ILVL rwh
BANK rwh
USR USR MUL 1 0 IP rwh rwh r
Field ILVL
Bits
Type Description CPU Priority Level 0H Lowest Priority ... ... Highest Priority FH Interrupt/PEC Enable Bit (globally) 0 Interrupt/PEC requests are disabled 1 Interrupt/PEC requests are enabled Hold Enable 0 external bus arbitration disabled 1 external bus arbitration enabled Reserved for Register File Bank Selection 00 Global register bank 01 Reserved 10 Local register bank 1 11 Local register bank 2 General Purpose Flag May be used by application General Purpose Flag May be used by application
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[15:12] rwh
IEN
[11]
rw
HLDEN
[10]
rw
BANK
[9:8]
rwh
USR1 USR0
[7] [6]
rwh rwh
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Central Processing Unit Field MULIP E Bits [5] [4] Type Description r rwh Multiplication/Division in progress Always set to 0 End of Table Flag 0 Source operand is neither 8000h nor 80h 1 Source operand is 8000h or 80h Zero Flag 0 ALU result is not zero 1 ALU result is zero Overflow Flag 0 No Overflow produced 0 Overflow produced Carry Flag 0 No carry/borrow bit produced 1 Carry/borrow bit produced Negative Result 0 ALU result is not negative 1 ALU result is negative
Z
[3]
rwh
V
[2]
rwh
C
[1]
rwh
N
[0]
rwh
ALU Status (N, C, V, Z, E, MULIP) The condition flags (N, C, V, Z, E) within the PSW indicate the ALU status resulting from the last performed ALU operation. They are set by the majority of instructions according to the specific rules depending on the ALU operation or data movement. After execution of an instruction which explicitly updates the PSW register, the condition flags may no longer represent an actual CPU status. An explicit write operation to the PSW register supersedes the condition flag values implicitly generated by the CPU. An explicit read access to the PSW register returns the value of the PSW register after execution of the immediately preceding instruction. Note: After reset, all of the ALU status bits are cleared. * N-Flag: For the majority of ALU operations, the N-flag is set to 1, if the most significant bit of the result contains a 1; otherwise, it is cleared. In the case of integer operations, the N-flag can be interpreted as the sign bit of the result (negative: N = 1, positive: N = 0). Negative numbers are always represented as the 2s complement of the corresponding positive number. The range of signed numbers extends from '-8000H' to '+7FFFH' for the word data type, or from '-80H' to '+7FH' for the byte data type. For Boolean bit operations with only one operand, the N-flag represents the previous state of the specified bit. For Boolean bit operations with two operands, the N-flag represents the logical XORing of the two specified bits.
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Central Processing Unit * C-Flag: After an addition, the C-flag indicates that a "Carry" from the most significant bit of the specified word or byte data type has been generated. After a subtraction or a comparison, the C-flag indicates a "Borrow" which represents the logical negation of a "Carry" for the addition. This means that the C-flag is set to 1, if no carry from the most significant bit of the specified word or byte data type has been generated during a subtraction. Subtraction is performed by the ALU as a 2s complement addition. The C-flag is cleared when this complement addition causes a "Carry". The C-flag is always cleared for logical, multiply and divide ALU operations, because these operations cannot cause a "Carry" flag to be set. For shift and rotate operations, the C-flag represents the value of the bit shifted out last. If a shift count of zero is specified, the C-flag will be cleared. The C-flag is also cleared for a Prioritize operation, because a 1 is never shifted out of the MSB during the normalization of an operand. For Boolean bit operations with only one operand, the C-flag is always cleared. For Boolean bit operations with two operands, the C-flag represents the logical ANDing of the two specified bits. * V-Flag: The addition, subtraction and 2's complement operations set the V-flag to '1' if the result exceeds the range of 16 bit signed numbers for word operations ('-8000H' to '+7FFFH'), or 8 bit signed numbers for byte operations ('-80H' to '+7FH'). Otherwise, the V-flag is cleared. Note, that the result of an integer addition, integer subtraction, or 2's complement is not valid if the V-flag indicates an arithmetic overflow. For multiplication and division the V-flag is set to 1 if the result can not be represented in a word data type, otherwise it is cleared. Note that a division by zero will always cause an overflow. Unlike the division result, the result of multiplication is valid regardless of V-flag value. Since the logical ALU operations cannot produce an invalid result, the V-flag is cleared by these operations. The V-flag is also used as 'Sticky Bit' for rotate right and shift right operations. Using only the C-flag, a rounding error caused by a shift right operation can be estimated as up to one half of the LSB of the result. In conjunction with the V-flag, the C-flag allows evaluation of the rounding error with a finer resolution (see table below). For Boolean bit operations with only one operand, the V-flag is always cleared. For Boolean bit operations with two operands, the V-flag represents the logical ORing of the two specified bits. Shift Right Rounding Error Evaluation * Z-Flag: The Z-flag is normally set to 1 if the result of an ALU operation equals zero; otherwise, it is cleared.
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Central Processing Unit C-Flag 0 0 1 1 V-Flag 0 1 0 1 Rounding Error Quantity 0< No rounding error Rounding error Rounding error Rounding error < = >
1 1
/2 LSB /2 LSB 1 /2 LSB
For addition and subtraction with "Carry", the Z-flag is only set to 1 if the Z-flag already contains a 1 as a result from previous operation and the result of the current ALU operation also equals zero. This mechanism supports the multiple precision calculations. For Boolean bit operations with only one operand, the Z-flag represents the logical negation of the previous state of the specified bit. For Boolean bit operations with two operands, the Z-flag represents the logical NORing of the two specified bits. For the Prioritize operation, the Z-flag indicates whether the second operand was zero or not. * E-Flag: End of table flag. The E-flag can be altered by the instructions which perform ALU or data movement operations. The E-flag is cleared by those instructions that cannot be reasonably used for table search operations. In all other cases, the E-flag value depends on the value of the source operand to signify whether the end of a search table is reached or not. If the value of the source operand of an instruction equals the lowest negative number which depends on the data format of the corresponding instruction ('8000H' for the word data type, or '80H' for the byte data type), the E-flag is set to 1; otherwise, it is cleared. * MULIP-Flag: The MULIP-flag always sticks to 0. Note: The MULIP flag is a part of the C166 task environment. For compatibility reasons, the bit is still implemented even if not used. A multiply and divide ALU operation of the C166S V2 CPU is no longer interruptible. * BANK: The BANK bitfield of the PSW registers indicates which one of the three physical register banks is activated. The BANK field is updated by hardware upon entry into an interrupt service routine, but it can be also modified by software. The BANK field can be changed explicitly by any instruction which can write to the PSW. Also, it is implicitly updated by the RETI instruction. * HLDEN: Refer to EBC Chapter 6.4.1. CPU Interrupt Status (IEN, ILVL) The Interrupt Enable bit allows global enable (IEN=1) or disable (IEN=0) of interrupts. The 4-bit Interrupt Level field (ILVL) specifies the priority of the current CPU activity. The interrupt level is updated by hardware upon entry into an interrupt service routine, but it can also be modified via software to prevent other interrupts from being acknowledged. In case an interrupt level '15' has been assigned to the CPU, it has the highest possible
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Central Processing Unit priority, and thus the current CPU operation cannot be interrupted except by hardware traps or external non-maskable interrupts. For details please, refer to Section 5 "Interrupt and Trap Functions". After reset, all interrupts are globally disabled and the lowest priority (ILVL=0) is assigned to the initial CPU activity.
2.7
Parallel Data Processing
The new CoXXX arithmetic instructions are performed in the MAC unit. The MAC unit provides single instruction-cycle, non-pipelined, 32-bit additions; 32-bit subtraction; right and left shifts; 16-bit by 16-bit multiplication; and multiplication with cumultative subtraction/addition. The MAC unit includes the following major components, shown in Figure 2-21: * * * * * * * * 16-bit by 16-bit signed/unsigned multiplier with signed result1) Concatenation Unit Scaler (one-bit left shifter) for fractional computing 40-bit Adder/Subtracter 40-bit Signed Accumulator Data Limiter Accumulator Shifter Repeat Counter
1)
The same hardware-multiplier is used in the ALU.
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Central Processing Unit
16-bit input operands Repeat Counter MCW Register Concatenation Unit signed/unsigned Multiplier
Signed Ext. 40-bit Adder/Subtracter Round+Saturation
ACCU-Shifter
40-bit Signed Accumulator
MSW Register Limiter
16-bit 32-bit 40-bit
Figure 2-21 Functional MAC Unit Block Diagram The working register of the MAC Unit is a dedicated 40-bit wide Accumulator register. A set of consistent flags is automatically updated in the MSW register (see Section 2.7.10) after each MAC operation. These flags allow branching on specific conditions. Unlike the PSW flags, these flags are not preserved automatically by the CPU upon entry into an interrupt or trap routine. All dedicated MAC registers must be saved on the stack if the MAC unit is shared between different tasks and interrupts.
2.7.1
Representation of Numbers and Rounding
The C166S V2 CPU supports the 2s complement representation of binary numbers. In this format, the sign bit is the MSB of the binary word. This is set to zero for positive numbers and set to one for negative numbers. Unsigned numbers are supported only by multiply/multiply-accumulate instructions which specify whether each operand is signed or unsigned. In 2s complement fractional format, the N-bit operand is represented using the 1.[N-1] format (1 signed bit, N-1 fractional bits). Such a format can represent numbers between -1 and +1-2-[N-1]. This format is supported when MP of MCW is set.
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Central Processing Unit The C166S V2 CPU implements 2s complement rounding'. With this rounding type, one is added to the bit to the right of the rounding point (bit 15 of MAL), before truncation (MAL is cleared).
2.7.2
The 16-bit by 16-bit signed/unsigned Multiplier and Scaler
The multiplier executes 16-bit by 16-bit parallel signed/unsigned fractional and integer multiplication in one CPU-cycle. The multiplier allows the multiplication of unsigned and signed operands. The result is always presented in a signed fractional or integer format. The result of the multiplication feeds a one-bit Scaler to allow compensation for the extra sign bit gained in multiplying two 16-bit 2s complement numbers.
2.7.3
Concatenation Unit
The Concatenation Unit enables the MAC unit to perform 32-bit arithmetic operations in one CPU cycle. The Concatenation Unit concatenates two 16-bit operands to a 32-bit operand before the 32-bit arithmetic operation is executed in the 40-bit adder/subtracter. The second required operand is always the current Accumulator contents. The Concatenation Unit is also used to pre-load the Accumulator with a 32-bit value.
2.7.4
One-bit Scaler
The One-bit scaler can shift the result of the concatenation unit or the output of the multiplier one bit to the left. The scaler is controlled by the executed instruction for the concatenation or by the MP control bit. The product is shifted one bit to the left to compensate for the extra sign bit gained in multiplying two 16-bit 2s complement numbers. The enabled automatic shift is performed only if both input operands are signed. MCW MAC Control Word
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 MP rw 9 MS rw
SFRb
8 0 r 7 0 r 6 0 r 5 0 r 4 0 r
Reset Value: 0000H
3 0 r 2 0 r 1 0 r 0 0 r
Field MP
Bits [10]
Type Description rw One-bit scaler control 0 Multiplier product shift disabled 1 Multiplier product shift enabled
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Central Processing Unit * MP-Control Bit: If the MP mode bit is set and both multiplier operands are signed types, the multiplier output is automatically shifted left by one bit. In the case of a multiply and accumulate operation, the output of the multiplier is shifted before being added to the accumulator.
2.7.5
The 40-bit Adder/Subtracter
The 40-bit adder/Subtracter allows intermediate overflows in a series of multiply/ accumulate operations. The adder/Subtracter has two input ports. The 40-bit port is the feedback of the Accumulator output through the ACCU-Shifter to the Adder/Subtracter. The 32-bit port is the input port for the operand coming from the One-bit Scaler. The 32-bit operands are signed and extended to 40-bits before the addition/subtraction is performed. The output of the Adder/Subtracter goes to the Accumulator. It is also possible to round the result and to saturate it on a 32-bit value automatically after every accumulation. The round operation is performed by adding 00'00008000H to the result. Automatic saturation is enabled by setting the saturation bit, the MAC Control Word (MCW). MCW MAC Control Word
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 MP rw 9 MS rw
SFRb
8 0 r 7 0 r 6 0 r 5 0 r 4 0 r
Reset Value: 0000H
3 0 r 2 0 r 1 0 r 0 0 r
Field MS
Bits [9]
Type Description rw Saturation control 0 Saturation disabled 1 Saturation enabled
* MS-Control Bit: If the MS mode bit is set, the accumulator will be automatically saturated to 32-bits. The MAC Unit supports signed saturation. When the accumulator is in the overflow saturation mode and an overflow occurs, the accumulator is loaded with either the most positive or the most negative value representable in a 32-bit value, depending on the direction of the overflow as well as the arithmetic used. The value of the accumulator upon saturation is 00'7fff'ffffh (positive) or ff'8000'0000h (negative).
2.7.6
The Data Limiter
Saturation arithmetic is also provided to selectively limit overflow when reading the accumulator by means of a CoSTORE ., MAS instruction. Limiting is
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Central Processing Unit performed on the MAC-Unit accumulator. If the contents of the Accumulator can be represented in the destination operand size without overflow, then the data limiter is disabled and the operand is not modified. If the contents of the accumulator cannot be represented without overflow in the destination operand size, the limiter will substitute a "limited" data as explained in the next table: Table 2-13 ME-flag 0 1 1 Limiter Output MN-flag x 0 1 Output of Limiter unchanged 7FFFH 8000H
Notice that in this particular case, both the accumulator and the status register are not affected. MAS is readable by means of a CoSTORE instruction only.
2.7.7
The Accumulator Shifter
The accumulator shifter is a parallel shifter with a 40-bit input and a 40 bit output. The source accumulator shifting operation are: * No shift (Unmodified) * Up to 16-bit Arithmetic Left Shift * Up to 16-bit Arithmetic Right Shift Notice that the ME, MSV, and MSL bits from MSW are affected by left shifts; therefore, if the saturation mechanism is enabled (MS), the behavior is similar to the one of the Adder/Subtracter. Note: Certain precautions are required in case of left shift with saturation enabled. Generally, if MAE contains significant bits, then the 32-bit value in the accumulator is to be saturated. However, it is possible that left shift may move some significant bits out of the Accumulator. The 40-bit result will be misinterpreted and will be either not saturated or saturated incorrectly. There is a chance that the result of left shift may produce a result which can saturate an original positive number to the minimum negative value, or vice versa.
2.7.8
The 40-bit Signed Accumulator Register
The 40-bit Accumulator consists of three smaller registers, MAH, MAL, and MAE. MAH and MAL are 16 bits wide; MAE is 8 bits wide. MAE is the Most Significant Byte of the 40-bit accumulator. This byte performs a guarding function. MAE is accessed as the Least Significant Byte of MSW. When MAH is written, the value in the accumulator is automatically adjusted to signed extended 40-bit format. That means MAE will be automatically loaded by zeros for the positive number (MAH has 0 in the most significant bit). In the case of the negative
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Central Processing Unit number (MAH has 1 in the most significant bit), the MAE will be loaded with ones, representing the extended 40-bit negative number in 2s compliment notation. One may see that the extended 40-bit value is equal to 32-bit value without extension. In other words, after this extension, MAE does not contain significant bits. Generally, this condition is present when the highest 9 bits of the 40-bit signed result are the same. During the accumulator operations, an overflow may happen and the result may not fit into 32-bits and the MAE will change. The extension flag "E", which is the part of the most significant byte of MSW, is set when the signed result in the accumulator has overflowed the 32-bit boundary. This condition is present when the highest 9 bits of the 40-bit signed result are not the same, i.e. MAE contains significant bits. Most CoXXX operations specify the 40-bit accumulator register as a source and/or a destination operand. The MAC Unit Accumulator Extension Byte MAE The MAE register is a part of the 40-bit MAC unit accumulator register. MAE is accessed as the Least Significant Byte of MSW. It is implicitly used by the MAC unit for MAC operation. In case a word operand is written into MAH, the MAE register becomes signextended. It can be accessed via any instruction capable of accessing an SFR.
MSW MAC Status Word
15 0 r 14 13 12 11 10 9 MZ rwh
SFRb
8 MN rwh 7 6 5 4
Reset Value: 0000H
3 2 1 0
MV MSL ME MSV MC rwh rwh rwh rwh rwh
MAE rwh
Field MAE
Bits [7:0]
Type Description rwh The most significant bits of the 40-bit Accumulator
The MAC Unit Accumulator High Word MAH The MAH register is a part of the 40-bit MAC unit accumulator register. It is implicitly used by the MAC unit for MAC operation. In case the word operand is written into MAH, MAL acquires the zero value and the MAE register becomes sign-extended. It can be accessed via any instruction capable of accessing an SFR.
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Central Processing Unit MAH Accumulator High Word
15 14 13 12 11 10 9
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
MAH rwh
Field MAH
Bits [15:0]
Type Description rwh High part of Accumulator The middle (bits 31 to 16) word of the 40-bit MAC Accumulator.
The MAC Unit Accumulator Low Word MAL The MAL register is a part of the 40-bit MAC unit accumulator register. It is implicitly used by the MAC Unit for MAC operation. In case of explicit write access to MAH, MAL receives a zero value. It can be accessed via any instruction capable of accessing an SFR.
MAL Accumulator Low Word
15 14 13 12 11 10 9
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
MAL rwh
Field MAL
Bits [15:0]
Type Description rwh Low part of Accumulator The low order 16 bits of the 40-bit MAC Accumulator.
2.7.9
The Repeat Counter MRW
The Repeat Counter MRW controls the number of repetitions a loop must be executed. The register must be pre-loaded before it can be used with -USRx CoXXX operations. MAC operations are able to decrement this counter. When an -USRx CoXXX instruction is executed, the MRW is checked on the zero value before the MRW is decremented. If
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Central Processing Unit the MRW equals zero, the USRx bit is set and MRW is not further decremented. The MRW can be accessed via any instruction capable of accessing a SFR. MRW MAC Repeat Word
15 14 13 12 11 10 9
SFRb
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
REPEAT COUNT rwh
Field REPEAT COUNT
Bits [15:0]
Type Description rwh 16-bit loop counter
All CoXXX instructions have a 3-bit wide repeat control field 'rrr' in the operand field to control the MRW repeat counter. It is located within CoXXX instructions at bit positions [31:29]. - - - - - `000' `001' `010' `011' '1xx' -> -> -> -> -> regular CoXXX instruction. RESERVED `- USR0 CoXXX' instruction, decrements repeat counter. `- USR1 CoXXX' instruction, decrements repeat counter. RESERVED.
The following example shows a loop which is executed 20 times. Every time the CoMACM instruction is executed, the MRW counter is decremented.
mov loop01: - USR1 CoMACM ADD JMPA MRW, #19 [IDX0+], [R0+] R2,#2 cc_nusr1, loop01
Because correctly predicted JMPA is executed in 0-cycle, it offers the functionality of a repeat instruction. Note: The USR0 bit should be used carefully because this bit was pre-existing and, therefore, may have been used by programmer or compiler.
2.7.10
The MAC Unit Status Word MSW
The MSW bit addressable register shows the current MAC Unit state. Two groups of bits represent the current MAC Unit status and the eight additional extension bits belonging to the MAC accumulator.
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Central Processing Unit MAC Unit Status (MV, MN, MZ, MC, MSV, ME, MSL) The condition flags (MV, MN, MZ, MC, MSV, ME, MSL) within the MSW indicate the MAC resulting from the most recently performed MAC operation. These flags are controlled by the majority of the MAC instructions according to specific rules. Those rules depend on the instruction managing the MAC or data movement operation. After execution of an instruction which explicitly updates the MSW register, the condition flags may no longer represent an actual MAC status. An explicit write operation to the MSW register supersedes the condition flag values implicitly generated by the MAC unit. An explicit read access to the MSW register returns the value of the MSW register after execution of the immediately preceding instruction. The MSW register can be accessed via any instruction capable of accessing an SFR. Note: After reset, all MAC status bits are cleared. MSW MAC Status Word
15 0 r 14 13 12 11 10 9 MZ rwh
SFRb
8 MN rwh 7 6 5 4
Reset Value: 0000H
3 2 1 0
MV MSL ME MSV MC rwh rwh rwh rwh rwh
MAE rwh
Field MAE MN
Bits [7:0] [8]
Type Description rwh rwh The most significant bits of the 40-bit Accumulator Negative Result 0 MAC result is positive 1 MAC result is negative Zero Flag 0 MAC result is not zero 1 MAC result is zero Carry Flag 0 No carry/borrow produced 1 Carry/borrow produced Sticky Overflow Flag 0 No Overflow occurred 1 Overflow occurred
MZ
[9]
rwh
MC
[10]
rwh
MSV
[11]
rwh
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Central Processing Unit Field ME Bits [12] Type Description rwh MAC Extension Flag 0 MAE does not contain significant bits 1 MAE contains significant bits Sticky Limit Flag 0 Result was not saturated 1 Result was saturated Overflow Flag 0 No Overflow produced 1 Overflow produced
MSL
[13]
rwh
MV
[14]
rwh
* Accu Extension MAE: These 8 bits are part of the 40-bit accumulator register. The MAC Unit implicitly uses these bits during a MAC operation. When writing to the MAH, the MAE is automatically signed extended with the most significant bit of the MAH register. * MN-Flag: For the majority of the MAC operations, the MN-flag is set to 1 if the most significant bit of the result contains a 1; otherwise, it is cleared. In the case of integer operations, the MN-flag can be interpreted as the sign bit of the result (negative: MN=1, positive: MN=0). Negative numbers are always represented as the 2s complement of the corresponding positive number. The range of signed numbers extends from '8000000000H' to '7FFFFFFFFFH'. * MZ-Flag: The MZ-flag is normally set to 1 if the result of a MAC operation equals zero; otherwise, it is cleared. * MC-Flag: After a MAC addition, the MC-flag indicates that a "Carry" from the most significant bit of the accumulator extension MAE has been generated. After a MAC subtraction or a MAC comparison, the MC-flag indicates a "Borrow" representing the logical negation of a "Carry" for the addition. This means that the MC-flag is set to 1, if no "Carry" from the most significant bit of the Accumulator has been generated during a subtraction. Subtraction is performed by the MAC Unit as a 2s complement addition and the MC-flag is cleared when this complement addition caused a "Carry". For left shift MAC operations, the MC-flag represents the value of the bit shifted out last. Right shift MAC operations always clear the MC-flag. The arithmetic right shift MAC operation can set the MC-flag if the enabled round operation generates a "Carry" from the most significant bit of the Accumulator extension MAE. * MSV-Flag: The addition, subtraction, 2s complement, and round operations always set the MSV-flag to 1 if the MAC result overflows the maximum range of 40-bit signed
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Central Processing Unit numbers. If the MSV-flag indicates an arithmetic overflow, the MAC result of an operation is not valid. The MSV-flag is a 'Sticky Bit'. Once set, other MAC operations cannot affect the status of the MSV-flag. Only a direct write operation can clear the MSV-flag. * ME-Flag: The ME-flag is set if the accumulator extension MAE contains significant bits. The ME-flag is set if the nine highest accumulator bits are not all equal. * MSL-Flag: The MSL-flag is set if an automatic saturation of the accumulator has happened. The automatic saturation is enabled if the MS-bit of the MAC Control Word register MCW is set. The MSL-Flag can be also set by instructions which limit the contents of the accumulator. If the accumulator has been limited, the MSL-Flag is set. The MSL-Flag is a 'Sticky Bit'. Once set, it cannot be affected by the other MAC operations. Only a direct write operation can clear the MSL-flag. * MV-Flag: The addition, subtraction, and accumulation operations set the MV-flag to 1 if the result exceeds the maximum range of signed numbers (80'00000000H to 7F'FFFFFFFFH); otherwise, the MV-flag is cleared. Note that if the MV-flag indicates an arithmetic overflow, the result of the integer addition, integer subtraction, or accumulation is not valid.
2.7.11
The MAC Unit Control Word MCW
This bit addressable register controls the operation of the MAC Unit. It can be accessed via any instruction capable of addressing an SFR. MCW MAC Control Word
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 MP rw 9 MS rw
SFRb
8 0 r 7 0 r 6 0 r 5 0 r 4 0 r
Reset Value: 0000H
3 0 r 2 0 r 1 0 r 0 0 r
Field MP
Bits [10]
Type Description rw One-bit scaler control 0 Multiplier product shift disabled 1 Multiplier product shift enabled Saturation control 0 Saturation disabled 1 Saturation enabled
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[9]
rw
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Central Processing Unit * MS-Control Bit: If the MS mode bit is set, the accumulator will be automatically saturated to 32 bits. The MAC Unit supports signed saturation. * MP-Control Bit: If the MP mode bit is set and both multiplier operands are of signed types, the multiplier output is automatically shifted left by one bit. In the case of a multiply and accumulate operation, the output of the multiplier is shifted before being added to the accumulator.
2.8
Dedicated CSFRs
The Constant Zeros Register ZEROS All bits of this bit addressable register are fixed to 0 by hardware. This register is readonly. Register ZEROS can be used as a register-addressable constant of all zeros for bit manipulation or mask generation. It can be accessed via any instruction which is capable of accessing an SFR. ZEROS Constant Zeros Register
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
SFRb
8 0 r 7 0 r 6 0 r 5 0 r 4 0 r
Reset Value: 0000H
3 0 r 2 0 r 1 0 r 0 0 r
Field 0
Bits [all]
Type Description r Fixed to Zero
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Central Processing Unit The Constant Ones Register ONES All bits of this bit addressable register are fixed to 1 by hardware. This register is readonly. Register ONES can be used as a register-addressable constant of all ones for bit manipulation or mask generation. It can be accessed via any instruction capable of accessing an SFR. ONES Constant Ones Register
15 1 r 14 1 r 13 1 r 12 1 r 11 1 r 10 1 r 9 1 r
SFRb
8 1 r 7 1 r 6 1 r 5 1 r 4 1 r
Reset Value: FFFFH
3 1 r 2 1 r 1 1 r 0 1 r
Field 1
Bits [all]
Type Description r Fixed to One
CPU Identification Register CPUID This 16-bit register contains the module and revision number of the implemented C166S V2 core module. CPUID CPU Identification Register
15 14 13 12 11 10 9
ESFR
8 7 6 5 4
Reset Value: 03??H
3 2 1 0
MODULE NUMBER r
VERSION NUMBER r
Field MODULE NUMBER
Bits [15:8]
Type Description r r Module Number 03H C166S V2 core module number Version Number Version Number
VERSION NUMBER [7:0]
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3
C166S V2 Memory Organization
The memory space of the C166S V2 CPU is configured in a "Von Neumann" architecture. This means that code and data are accessed within the same linear address space. All of the physically separated memory areas, including internal ROM/ Flash/DRAM (if integrated into a specific derivative), internal RAM, internal Special Function Register Areas (SFRs and ESFRs), and external memory are mapped into a single common address space. The C166S V2 CPU provides a total addressable memory space of 16 MBytes. This address space is arranged as 256 segments of 64 KBytes each. Each segment is again subdivided into four data pages of 16 KBytes each (see Figure 3-1). Most internal memory areas are mirrored into the system segment, segment 0. The upper 4 KBytes of segment 0 (00'F000H...00'FFFFH) hold the Special Function Register Areas (SFR and ESFR) and the DPRAM areas. Data may be stored in any part of the internal memory areas. Code may be stored in any part of the internal memory areas except the SFR blocks, the DPRAM, and Internal SRAM and internal IO area as these areas may be used for control/data, but not for instructions. The 64 KByte memory area of segment 191 (BF'0000H...BF'FFFFH) cannot be used to store code and data. It is reserved for "on chip" boot and debug/monitor program memories. Accesses to internal memory areas on devices without the appropriate internal memories will produce unpredictable results.
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FFFFFFH Segment 255 Data Page 1023 FF0000H
int. program memory
4MByte
C00000H Segment 191 reserved ext. memory 8MByte BF0000H 00'FFFFH
410000H Segment 64 400000H
Data Page 3
RAM / SFR internal-IO Area Internal SRAM
00'F000H 00'E000H
00'C000H
2MByte
ext. IO
210000H Segment 32 200000H
Data Page 2
Internal SRAM
00'8000H
030000H ~2 MByte ext. memory Segment 2 020000H Segment 1 010000H Data Page 3
Data Page 1
External Memory
00'4000H
Data Page 0
Segment 0
...
Data Page 0 000000H 16MByte
System Segment 0 64KByte
000000H
Figure 3-1
Memory Areas and Address Space
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3.1
Data Organization in Memory
Bytes are stored at even or odd byte addresses. Words are stored in ascending memory locations with the low byte at an even byte address followed by the high byte at the next odd byte address. Instruction double words are stored in ascending memory locations as two subsequent words, without any restrictions (non aligned). Single bits are always stored in the specified bit position at a word address. The memory and registers store data and instructions in little endian byte order (the least significant bytes are at lower addresses) The byte ordering is illustrated in Figure 3-2. Bit position 0 is the least significant bit of the byte at an even byte address, and bit position 15 is the most significant bit of the byte at the next odd byte address. Bit addressing is supported for a part of the Special Function Registers, a part of the internal RAM, and for the General Purpose Registers.
1 1 ... Bits ... 7 6 ... Bits ... Byte Byte Word (High Byte) Word (Low Byte) Double Word (High) Double Word (Third) Double Word (Second) Double Word (Low Byte) 8 0
xxxx'xxxAH xxxx'xxx9H xxxx'xxx8H xxxx'xxx7H xxxx'xxx6H xxxx'xxx5H xxxx'xxx4H xxxx'xxx3H xxxx'xxx2H xxxx'xxx1H xxxx'xxx0H xxxx'xxxFH
Figure 3-2
Storage of Words, Bytes and Bits in a Byte Organized Memory
Note: Byte units forming a single word must always be stored within the same physical (internal, external, ROM, RAM) and organizational (page, segment) memory area.
3.2
Internal Program Memory
The C166S V2 CPU reserves an address area of 4 MBytes for Internal Program Memory. The internal memory can be ROM, SRAM, Flash or DRAM. Devices with
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C166S V2 Memory Organization Internal Program Memory expand the Internal Program Memory area from the beginning of segment 192, i.e. starting at address C0'0000H. The Internal Program Memory can be used for both code (instructions) and data (constants, tables, etc.) storage. Code fetches are always made on even word addresses. The highest possible code storage location in the Internal Program Memory is either xx'xxFEH for single word instructions, or xx'xxFCH, for double word instructions. Any word and byte data read access may use the indirect or long 16-bit addressing mode. There is no short addressing mode for Internal Program Memory operands. Any word data access is made to an even byte address. Any double word access is made to a modulo 4 address (even word address). The highest possible word data storage location in the Internal Program Memory is xxxx'xxFEH, the highest double word location xxxx'xxFCH. The Internal Program Memory is not provided for single bit storage, and therefore is not bit addressable. Note: The `x' in the locations above depend on the available Internal Program Memory.
3.3
DPRAM, Internal SRAM, and SFR Areas
The C166S V2 CPU differentiates between various internal memory types and internal peripheral areas. These data memories and the IO/SFR areas are located within data page 3 and provide fast accesses using one dedicated Data Page Pointer (see Figure 33). Note: Code access is not possible from the DPRAM, the Internal RAM, or the IO/SFR areas.
3.3.1
Data Memories
Two dedicated volatile memories are available for data storage: * The DPRAM can be used for: - General Purpose Register Banks (GPRs) - Variable and other data storage, especially for MAC operands - System Stack (not recommended if Internal SRAM is integrated) * The Internal SRAM can be used for: - Variable and other data storage - System Stack (recommended if Internal SRAM is integrated) A 3 kByte memory area (00`F200H...000'FE00H) is reserved for the DPRAM. The upper 256 Bytes of the DPRAM (00'FD00H...00'FDFFH) and the GPRs of the current bank are provided for single bit storage, and thus are bit addressable (see shaded blocks in Figure 3-3). Any word or byte data in the DPRAM can be accessed via indirect or long 16-bit addressing modes, if the selected DPP register points to data page 3. Any word
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C166S V2 Memory Organization data access is made on an even byte address. The highest possible word data storage location in the DPRAM is 0000'FDFEH. A 24 kByte memory area (00`8000H...000'DFFFH) is reserved for the Internal SRAM. Any word and byte data in the Internal SRAM can be accessed via indirect or long 16-bit addressing modes, if the selected DPP register points to data page 3 or data page 2. Any word data access is made on an even byte address. The highest possible word data storage location in the Internal SRAM is 0000'DFFEH.
00'FFFFH 00'F000H 00'E000H internal IO DPRAM 00'FD00H 00'C000H SFR Area 00'FE00H 00'FFFFH
RAM/SFR Area Data Page 3 IO Area Intenal SRAM
Data Page 2
Intenal SRAM
00'8000H DPRAM Data Page 1
External Memory
00'4000H
Data Page 0 ESFR Area System Segment 0 64KByte 000000H
00'F200H
00'F000H
Figure 3-3
RAM and SFR Areas
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3.3.2
Special Function Register Areas
The functions of the CPU, the bus interface, the IO ports, and the on-chip peripherals of the C166S V2 device are controlled via a number of so-called Special Function Registers (SFRs). These SFRs are arranged within two areas of 512 Bytes each. The first register block, the SFR area, is located in the 512 Bytes above the DPRAM (00'FE00H...00'FFFFH). The second register block, the Extended SFR (ESFR) area, is located in the 512 Bytes below the DPRAM (00'F000H...00'F1FFH). Special Function Registers can be addressed via indirect and long 16-bit addressing modes. Using an 8-bit offset together with an implicit base address allows word SFRs and their respective low bytes to be addressed. However, this does not work for the respective high bytes! Note: High byte access of SFRs using the 8-bit offset addressing mode is not possible. Note: Writing to any byte of an SFR causes the non-addressed complementary byte to be cleared! Note: GPRs can be accessed using the 8-bit offset addressing mode, but they are not mapped into the SFR and ESFR memory area. an internal peripheral bus access is executed using the respective long address instead of a GPR access. The upper half of each register block (except the 16 highest words, refer to Section 2.5.1 ) is bit-addressable, so the respective control/status bits can be directly modified or checked using bit addressing. When accessing registers in the ESFR area using 8-bit addresses or direct bit addressing, the Extend Register (EXTR) instruction is required to switch the short addressing mechanism from the standard SFR area to the Extended SFR area before accessing registers in the ESFR area. This is not required for 16-bit and indirect addresses. GPRs R15...R0 are duplicated, i.e. they are accessible within both register blocks via short 2-, 4- or 8-bit addresses without switching. Example: EXTR MOV BFLDL BSET MOV #4 ;Switch to ESFR area for the next four instructions ODP2, #data16 ;ODP2 (ESFR register) uses 8-bit register addressing DP6, #mask, #data8;DP6 (ESFR register) bit addressing for bit fields DP6.7 ;DP6 (ESFR register) bit addressing for single bits T8REL, R1 ;T8REL uses 16-bit address, R1 is duplicated ;...and also accessible via the ESFR mode ;(EXTR is not required for this access) ;------------------;The scope of the EXTR #4 instruction ends here! T8REL, R1 ;T8REL uses 16-bit address, R1 is duplicated ;...and does not require switching
;------MOV
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C166S V2 Memory Organization To minimize the switching of SFR banks, the ESFR area contains registers that are mainly required for initialization and mode selection. Registers that need to be accessed frequently are allocated to the standard SFR area wherever possible. Note: The tools are equipped to monitor accesses to the ESFR area and will automatically insert EXTR instructions, switch the SFR bank address, or issue a warning in case of missing or excessive EXTR instructions.
3.3.3
IO Area
Some parts of the C166S V2 CPU memory area are marked as IO. These memory areas have the following special properties: - Accesses are not buffered and cached The write back buffers and caches of the C166S V2 CPU are not used to store IO read and write accesses. - Special handling of destructive reads The pipeline of the C166S V2 CPU allows speculative reads. Memory locations of the IO area are not read until all speculations are solved. Destructive read accesses are delayed. - Write before read execution The pipeline length of the C166S V2 CPU enables a read instruction to read a memory location before a preceding write instruction has executed its write access. Data forwarding guarantees the correct instruction flow execution. In case of an IO read access, the read access will be delayed until all IO writes pending in the pipeline are executed. In case of a write access, peripherals will change their internal states. Write accesses must actually be executed before the next read access is initiated. Note: The bit manipulation instructions (BSET, BCLR...) use the read-modify-write approach. The IO read access of this instructions will be stalled until all IO write accesses are finished. The following memory areas are marked as IO: - 2 Mbytes of external IO located to 20'0000H to 3F'FFFFH - SFR and ESFR areas located from 00'FE00H to 00'FFFFH and from 00'F000H to 00'F1FFH respectively - 4 kByte internal IO located from 00'E000H to 00'EFFFH Note: All external IO areas support real byte accesses. All internal IO areas do not support real byte transfers. For more details on the exception of (E)SFR areas refer to Section 3.3.2.
3.3.4
PEC Source and Destination Pointers
The source and destination pointers for data transfers on the PEC channels are located in the 4-kByte internal IO area. Each channel uses a pair of pointers stored in two
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C166S V2 Memory Organization subsequent word registers, with the source pointer (SRCPx) on the lower and the destination pointer (DSTPx) on the higher word address (x = channel number). The PEC registers are part of the PEC itself and are addressed via the internal peripheral bus. In contrast to the C166 family, the pointers are not located in the internal RAM. The pointers are located in the 4 kByte internal IO. If a PEC channel is not used, the corresponding pointer locations are not available and cannot be used for word and byte storage. Writing to any byte of the PEC pointers does cause the non-addressed complementary byte to be cleared! For more detail about use of the source and destination pointers for PEC data transfer, see the "Interrupt and Exception Execution" section.
3.4
External Memory Space
The C166S V2 CPU is capable of using an address space of up to 16 MBytes. Only portions of this address space are occupied by internal memory areas. All addresses not used for on-chip memory or for registers may reference external memory locations. This external memory is accessed via the external bus interface. This interface may further limit the amount of addressable external memory. External word and byte data can be accessed only via indirect or long 16-bit addressing modes using one of the four DPP registers. There is no short addressing mode for external operands. Any word data access is made to an even byte address and double word accesses to modulo 4 byte addresses (even word address). The external memory is not provided for single bit storage and therefore is not bit addressable.
3.4.1
Boot and Debug/Monitor Program Memories
The 64 KByte memory area of segment 191 (BF'0000H...BF'FFFFH) is reserved for boot and debug/monitor program memories. These "on chip" memories are accessed using the EBC and are a part of the EBC`s external memory space. Accesses are not visible at the port pins of the EBC even if these memories are part of the external memory space. During normal code execution, this segment is not accessible for the C166S V2 CPU. In case of a read access, the EBC will deliver the predefined 0000H value and write access will not be executed. Only in special boot and emulation modes can the memories of segment 191 be accessed. Note: Segment 191 (BF'0000H...BF'FFFFH) is not usable for the system application. External memories and peripherals located in this segment will never be accessed.
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3.5
Crossing Memory Boundaries
The address space of the C166S V2 CPU is implicitly divided into logical memory areas and equally sized blocks of different granularity. Crossing the boundaries between these areas or blocks (code or data) requires special attention to ensure that the controller executes the desired operations. Memory Areas are partitions of the address space that represent different kinds of memory (if provided at all). These memory areas are the internal RAM areas, the internal IO areas, the internal Program Memories (if available), and the external memory. Accessing subsequent data locations that belong to different memory areas is not fully supported and may therefore lead to erroneous results. There is no problem if the memory boundaries are word aligned. However, when executing code, the different memory areas (Internal Program Memory areas and external memory) must be switched explicitly via branch instructions. Sequential boundary crossing is not supported and may leads to erroneous results. Segments are contiguous blocks of 64 KBytes each. They are referenced via the Code Segment Pointer (CSP) for code fetches and via an explicit segment number for data accesses overriding the standard DPP scheme. During code fetching, segments are not changed automatically, but rather must be switched explicitly. The instructions JMPS, CALLS, and RETS will do this. Larger sequential programs make sure that the highest used code location of a segment contains an unconditional branch instruction to the respective following segment, to prevent the prefetcher from trying to leave the current segment. Data Pages are contiguous blocks of 16 KBytes each. They are referenced via the data page pointers DPP3...0 and via an explicit data page number for data accesses overriding the standard DPP scheme. Each DPP register can select one of the possible 1024 data pages. The DPP register that is used for the current access is selected via the two upper bits of the 16-bit data address. Subsequent 16-bit data addresses that cross the 16 KByte data page boundaries will use different data page pointers, while the physical locations need not be subsequent within memory.
3.6
System Stack
The system stack may be defined within the internal RAM, but can be also located externally. The size of the system stack is limited to 64 kBytes and must be located in one segment. For all system stack operations, the stack memory is accessed via a 24 bit stack pointer. The Stack Pointer register (SP) represents the low order 16 bits of the 24 bit stack pointer, also referred to as Stack Pointer Offset. The Stack Segment Pointer (SPSEG) represents the high order 8 bits of the stack pointer, also referred to as Stack Segment. The system stack implementation in the C166S V2 CPU is from high to low memory. The system stack grows downward as it is filled. The SP register is decremented first each
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C166S V2 Memory Organization time data is pushed on the system stack, and incremented after each time the data is pulled from the system stack. Only word accesses are supported to the system stack. The 24 bit stack pointer points to the address of the latest system stack entry, rather than to the next available system stack address. A stack overflow (STKOV) register and a Stack Underflow (STKUN) register are provided to control the lower and upper limits of the selected stack area. These two stack boundary registers can be used for protection against data destruction.
3.6.1
Data Organization in Global General Purpose Registers
The C166S V2 CPU differentiates between global memory mapped General Purpose Register (GPR) banks and local not mapped GPR banks. In addition to the memory mapped register banks, the C166S V2 CPU has two local not memory mapped GPR register banks for very fast context switching (see Section 2.4). Note: The local GPR banks are not memory mapped and the GPRs cannot be accessed using a long or indirect memory address. The C166S V2 CPU supports register bank (context) switching. Multiple global memory mapped register banks can physically exist within the DPRAM at the same time; however, only the global register bank selected by the Context Pointer register (CP) is active at a given time. Selecting a new active global register bank is done by simply updating the CP register.
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C166S V2 Memory Organization Mapping of the global General Purpose Registers to DPRAM Addresses is shown here: DPRAM Address + 1EH + 1CH + 1AH + 18H + 16H + 14H + 12H + 10H + 0EH + 0CH + 0AH + 08H + 06H + 04H + 02H + 00H Byte Registers ----------------RH7RL7 RH6RL6 RH5RL5 RH4RL4 RH3RL3 RH2RL2 RH1RL1 RH0RL0 Word Register R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
A particular Switch Context (SCXT) instruction performs register bank switching and an automatic save of the previous context. The number of implemented register banks (arbitrary sizes) is limited only by the size of the available DPRAM. The memory mapped GPRs use a block of sixteen consecutive words within DPRAM Segment 0. The Context Pointer (CP) register determines the base address of the currently active register bank. This register bank may consist of up to sixteen word GPRs (R0, R1, .. R15), and/or of up to sixteen byte GPRs (RL0, RH0, , RL7, RH7). The sixteen byte GPRs are mapped onto the first eight word GPRs (see table above). In contrast to the system stack, a register bank grows from lower towards higher address locations and occupies a maximum space of 32 bytes. The GPRs are accessed via short 2-, 4- or 8-bit addressing modes using the Context Pointer (CP) register as base address (independent of the current DPP register contents). Additionally, each bit in the currently active register bank can be accessed individually.
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Instruction Pipeline
4
Instruction Pipeline
The pipeline of the C166S V2 CPU has seven stages. Each stage processes its individual task. The first two stages form the instruction fetch pipeline and the remaining five stages constitute the instruction processing pipeline. The instruction fetch pipeline is used to pre-fetch instructions and to store them into an instruction FIFO. The preprocessing of branch instructions in combination with the instruction FIFO allows filling of the execution pipeline with a continuous flow of instructions. In the case of an incorrectly predicted instruction flow, the instruction fetch pipeline is bypassed to reduce the number of dead cycles. All instructions must pass through each of the five stages of the instruction processing pipeline regardless of the need of some stages to complete an execution of certain instructions. The following illustrates the pipeline stages operation. 1st -> PREFETCH: This stage pre-fetches instructions from the PMU in the predicted order. The instructions are pre-processed in the branch detection unit to detect branches. The prediction logic decides if the branches are assumed to be taken or not. 2st -> FETCH: The instruction pointer of the next instruction to be fetched is calculated according to the branch prediction rules. For zero-cycle branch execution, the Branch Folding Unit preprocesses and combines detected branches with the preceding instructions. Pre-fetched instructions are stored in the instruction FIFO. At the same time, instructions are transported out of the instruction FIFO to be executed in the instruction processing pipeline. 3st -> DECODE: The instructions are decoded and, if required, the register file is accessed to read the GPR used in indirect addressing modes. 4st -> ADDRESS: All the operand addresses are calculated. The SP register is de/incremented for all instructions which implicitly access the system stack. 5st -> MEMORY: All the required operands are fetched. 6st -> EXECUTE: An ALU or MAC-Unit operation is performed on the previously fetched operands. The Condition flags are updated. All explicit write operations to CPU-SFR registers and all auto-in/decrement operations of GPRs used as indirect address pointers are performed. 7st -> WRITE BACK:
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Instruction Pipeline All external operands and the remaining operands within the internal DPRAM space are written back. Operands located in the internal SRAM are buffered in the Write Back Buffer. There are C166S V2 CPU-specific so-called injected instructions. These instructions are generated internally by the machine to provide the time needed to process instructions requiring more than one CPU cycle for processing. They are automatically injected into the decode stage of the pipeline, then they pass through the remaining stages like every standard instruction. Program interrupt, PEC transfer, and OCE operations are also performed by means of injected instructions. Although these internally injected instructions will not be noticed in reality, they are introduced here to ease the explanation of the pipeline operation. Because up to five different instructions are processed simultaneously, additional hardware has been dedicated in the C166S V2 CPU to deal with dependencies which may exist between instructions in different pipeline stages. This extra hardware supports 'forwarding' of the operand read and write values and resolves most of the possible conflicts--such as multiple usage of buses--in a time optimized way without performance loss. This makes the pipeline unnoticeable for the user in most cases. However, there are some rare cases in which the C166S V2 CPU pipeline requires attention by the programmer. In these cases, the delays caused by the pipeline conflicts can be used for other instructions to optimize performance. Note: The C166S V2 CPU has a fully interlocked pipeline. Instruction re-ordering is only required for performance reasons. The following examples describe the pipeline behavior in special cases and give principle rules to improve the performance by re-ordering the execution of instructions.
4.1
Instruction Dependencies in Different Pipeline Stages
Bandwidth limitations and data dependencies between instructions can dramatically decrease the performance of CPUs. The C166S V2 CPU has dedicated hardware to detect and to resolve different kind of dependencies. Some of those dependencies are described in the following section.
4.1.1
The General Purpose Registers
The GPRs are the working registers of the C166S V2 CPU and there are a lot of possible dependencies between instructions using GPRs. A high speed five port register file prevents bandwidth conflicts. The dedicated hardware is implemented to detect and resolve the data dependencies. Special forwarding busses are used to forward GPR values from one pipeline stage to another. This allows the execution of instructions without any delay despite of data dependencies.
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In+2 In+3 In+4 ADD R6,R0 ADD R6,R1 ......
.
Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= ADD R0,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= ADD R3,R0 In= ADD R0,R1 In-1 In-2 In-3
Tn+2
In+2= ADD R6,R0 In+1= ADD R3,R0 In= ADD R0,R1 In-1 In-2
Tn+3
In+3= ADD R6,R1 In+2= ADD R6,R0 In+1= ADD R3,R0 In= ADD R0,R1 In-1
Tn+4
In+4 In+3= ADD R6,R1 In+2= ADD R6,R0 In+1= ADD R3,R0 In= ADD R0,R1
Tn+5
In+5 In+4 In+3= ADD R6,R1 In+2= ADD R6,R0 In+1= ADD R3,R0
Only in the case in which a GPR is updated in the ALU and then directly used in one of the following instructions as an address pointer will the detection unit force the pipeline to stall. None of the instructions using indirect addressing modes are capable of using a GPR, which is to be updated by one of the two immediately preceding instructions. The new value of the GPR is calculated in the execute stage, while the instruction using an indirect addressing mode accesses the GPR already in the Decode Stage. The instruction is stalled in the address stage until the operation in the ALU is executed and the result is forwarded to the address stage.
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Instruction Pipeline
In-1 In In+1 In+2 In+3 In+4 ........ ADD R0,R1 MOV R3,[R0] ADD R6,R0 ADD R6,R1 ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= ADD R0,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= MOV R3,[R0] In= ADD R0,R1 In-1 In-2 In-3
Tn+2
In+2 In+1= MOV R3,[R0] In= ADD R0,R1 In-1 In-2
Tn+3
In+2 In+1= MOV R3,[R0]
Tn+4
In+2 In+1= MOV R3,[R0]
Tn+5
In+3 In+2 In+1= MOV R3,[R0]
In= ADD R0,R1 In-1 In= ADD R0,R1
To avoid stalls, one multicycle or two single cycle instructions may be inserted. These instructions must not update the GPR used for indirect addressing.
In-1 In In+1 In+2 In+3 In+4 ........ ADD R0,R1 ADD R6,R0 ADD R6,R1 MOV R3,[R0] ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= ADD R0,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= ADD R6,R0 In= ADD R0,R1 In-1 In-2 In-3
Tn+2
In+2= ADD R6,R1 In+1= ADD R6,R0 In= ADD R0,R1 In-1 In-2
Tn+3
In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= ADD R6,R0 In= ADD R0,R1 In-1
Tn+4
In+4 In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= ADD R6,R0 In= ADD R0,R1
Tn+5
In+5 In+4 In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= ADD R6,R0
4.1.2
Indirect Addressing Modes
In the case of read accesses using indirect addressing modes, the Address Generation Unit uses a speculative addressing mechanism. The read data path to one of the different memory areas (DPRAM, Internal SRAM, etc.) is selected according to a history table before the address is decoded. This history table has one entry for each of the
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Instruction Pipeline GPRs. The entries store the information of the last accessed memory area using the corresponding GPR. In the case of an incorrect prediction of the memory area, the read access must be restarted. It is recommended that the GPR used for indirect addressing point to the same memory area. If an updated GPR points to a different memory area, the next read operation will access the wrong memory area. The read access must be repeated, which leads to pipeline stalls.
In-1........ ADD R3,[R0] , points to DPRAM In In+1 MOV R0,R4 ..... Ii MOV DPPX,... ,change DPPx ..... Im ADD R6,[R0] , points to SRAM R6,R1 Im+1 ADD Im+2 ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= MOV R3,[R0] In-1 In-2 In-3 In-4
Tn+1
In+1= MOV R0,R4 In= MOV R3,[R0] In-1 In-2 In-3
Tn+2
In+2 In+1= MOV R0,R4 In= MOV R3,[R0] In-1 In-2
Tn+3
In+3 In+2 In+1= MOV R0,R4 In= MOV R3,[R0] In-1
Tn+4
In+4 In+3 In+2 In+1= MOV R0,R4 In= MOV R3,[R0]
Tn+5
In+5 In+4 In+3 In+2 In+1= MOV R0,R4
Tm
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
Im= MOV R6,[R0] Im-1 Im-2 Im-3 Im-4
Tm+1
Im+1= ADD R6,R1 Im= MOV R6,[R0] Im-1 Im-2 Im-3
Tm+2
Im+1= ADD R6,R1 Im= MOV R6,[R0]
Tn+3
Im+2 Im+1= ADD R6,R1 Im= MOV R6,[R0]
Tn+4
Im+3 Im+2 Im+1= ADD R6,R1 Im= MOV R6,[R0]
Tn+5
Im+4 Im+3 Im+2 Im+1= ADD R6,R1 Im= MOV R6,[R0]
Im-1 Im-2 Im-1
4.1.3
Memory Bandwidth Conflicts
Memory bandwidth conflicts can occur if instructions in the pipeline access the same memory area at the same time. Special access mechanisms are implemented in the C166S V2 CPU to minimize conflicts. The internal DPRAM of the C166S V2 CPU has
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Instruction Pipeline two independent read/write ports; this allows parallel read and write operation without delays. Write accesses to the internal SRAM can be buffered in a Write BACK Buffer until read accesses are finished. * Bandwidth conflicts in the DPRAM Area All instructions except the CoXXX instructions can read only one memory operand per cycle. A conflict between the read and one write access cannot occur because the DPRAM has two independent read/write ports.
In-1 In In+1 In+2 In+3 In+4 ........ ADD op1,R1 ADD R6,R0 ADD R6,op2 MOV R3,[R0] ........
Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= ADD op1,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2 In-3
Tn+2
In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2
Tn+3
In+3= MOV R3,[R0] In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1 In-1
Tn+4
In+4 In+3= MOV R3,[R0] In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1
Tn+5
In+5 In+4 In+3= MOV R3,[R0] In+2= ADD R6,op2 In+1= ADD R6,R0
Note: Only other pipeline stall conditions can generate a DPRAM bandwidth conflict. The DPRAM is a synchronous pipelined memory. The read access starts with the valid addresses on the address stage. The data are delivered in the Memory stage. If a memory read access is stalled in the Memory stage and the following instruction on the Address stage tries to start a memory read, the new read access must be delayed as well. But, this conflict is hidden by an already existing stall of the pipeline.
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Instruction Pipeline * Bandwidth conflicts in the DPRAM Area The CoXXX instructions are the only instructions able to read two memory operands per cycle. A conflict between the two read and one pending write access can occur if all three operands are located in the DPRAM areas. This is especially important for performance in the case of executing a filter routine. One of the operands should be located in the internal SRAM to guarantee a single cycle execution time of the CoXXX instructions.
In-1 In In+1 In+2 In+3 In+4
.
........ ADD op1,R1 ADD R6,R0 CoMAC [IDX0],[R0] MOV R3,[R0] ....... Tn Tn+1
In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2 In-3
Tn+2
In+2= CoMAC ..... In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2
Tn+3
In+3= MOV R3,[R0] In+2= CoMAC ..... In+1= ADD R6,R0 In= ADD op1,R1 In-1
Tn+4
In+4 In+3= MOV R3,[R0] In+2= CoMAC ..... In+1= ADD R6,R0 In= ADD op1,R1
Tn+5
In+4 In+3= MOV R3,[R0] In+2= CoMAC .....
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= ADD op1,R1 In-1 In-2 In-3 In-4
In+1= ADD R6,R0
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Instruction Pipeline * Internal SRAM The internal SRAM is a single port memory with one read/write port. To reduce the number of bandwidth conflict cases, a Write Back Buffer is implemented. It has three entries for buffer data buffering. Only if the buffer is filled and a read and write accesses occur at the same time, must the read access be stalled while one of the buffer entries is written back.
In-1 In In+1 In+2 In+3 In+4
.
........ ADD op1,R1 ADD R6,R0 ADD R6,op2 MOV R3,R2 ......... Tn Tn+1
In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2 In-3 full
Tn+2
In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1 In-1 In-2 full
Tn+3
In+3= MOV R3,R2 In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1 In-1 full
Tn+4
In+4 In+3= MOV R3,R2 In+2= ADD R6,op2 In+1= ADD R6,R0 In= ADD op1,R1 full
Tn+5
In+4 In+3= MOV R3,R2 In+2= ADD R6,op2
DECODE ADDRESS MEMORY EXECUTE WRITE BACK Write Back Buffer
In= ADD op1,R1 In-1 In-2 In-3 In-4 full
In+1= ADD R6,R0 full
4.1.4
CPU-SFRs and the Pipeline
CPU-SFRs control the CPU functionality and behavior. Changes and updates of CSFRs influence the instruction flow in the pipeline. Therefore, special care is required to ensure that instructions in the pipeline always work with the correct CSFRs values. CSFRs are updated late on the Executed stage of the pipeline. Meanwhile, without conflict detection, the instructions in the Decode, Address, and Memory stages would still work without updated register values. The C166S V2 CPU detects conflict cases and stalls the pipeline to guarantee a correct execution. For performance reasons, the CPU differentiates between different classes of CPU-SFRs. The flow of instructions through the pipeline can be improved by following the given rules used for instruction re-ordering. There are three classes of CPU-SFRs: * The harmless CSFRs (CPUID, ONES, ZEROS, MCW) do not generate pipeline conflict cases. The MCW can be changed without stalling the pipeline. The MCW is
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Instruction Pipeline updated in the Execute Stage and is not used for control purposes in the previous stages. CPUID, ONES, and ZEROS are not changeable at all.
In-1 In In+1 In+2 In+3 In+4 ........ MOV MCW,#16 ADD R6,R0 ADD R6,R1 MOV R3,[R0] ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
Tn+1
Tn+2
In+2= ADD R6,R1
Tn+3
In+3= MOV R3,[R0] In+2= ADD R6,R1
Tn+4
In+4 In+3= MOV R3,[R0] In+2= ADD R6,R1
Tn+5
In+5 In+4 In+3= MOV R3,[R0] In+2= ADD R6,R1
In= In+1= MOV MCW,#16 ADD R6,R0 In-1 In-2 In-3 In-4
In= In+1= MOV MCW,#16 ADD R6,R0 In-1 In-2 In-3
In= In+1= MOV MCW,#16 ADD R6,R0 In-1 In-2
In= In+1= MOV MCW,#16 ADD R6,R0 In-1
In= In+1= MOV MCW,#16 ADD R6,R0
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Instruction Pipeline * The CSFR result registers MDH, MDL, MSW, MAH, MAL, MRW of the ALU and MACUnit are updated late in the Execute stage of the pipeline. If an instruction (except CoSTORE) accesses explicitly these registers in the memory stage, the value cannot be forwarded. The instruction must be stalled for one cycle on the Memory stage.
In-1 In In+1 In+2 In+3 In+4 ........ MUL R0,R1 MOV R6,MDL ADD R6,R1 MOV R3,[R0] ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= MUL R0,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= MOV R6,MDL In= MUL R0,R1 In-1 In-2 In-3
Tn+2
In+2= ADD R6,R1 In+1= MOV R6,MDL In= MUL R0,R1 In-1 In-2
Tn+3
In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= MOV R6,MDL In= MUL R0,R1 In-1
Tn+4
In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= MOV R6,MDL
Tn+5
In+4 In+3= MOV R3,[R0] In+2= ADD R6,R1 In+1= MOV R6,MDL
In= MUL R0,R1
By reordering instructions, the bubble in the pipeline can be filled with an instruction not using this resource.
In-1 In In+1 In+2 In+3 In+4 ........ MUL R0,R1 MOV R3,[R0] MOV R6,MDL ADD R6,R1 ........ Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= MUL R0,R1 In-1 In-2 In-3 In-4
Tn+1
In+1= MOV R3,[R0] In= MUL R0,R1 In-1 In-2 In-3
Tn+2
In+2= MOV R6,MDL In+1= MOV R3,[R0] In= MUL R0,R1 In-1 In-2
Tn+3
In+3= ADD R6,R1 In+2= MOV R6,MDL In+1= MOV R3,[R0] In= MUL R0,R1 In-1
Tn+4
In+4 In+3= ADD R6,R1 In+2= MOV R6,MDL In+1= MOV R3,[R0] In= MUL R0,R1
Tn+5
In+5 In+4 In+3= ADD R6,R1 In+2= MOV R6,MDL In+1= MOV R3,[R0]
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Instruction Pipeline * The third class are CSFRs which affect the whole CPU or the pipeline before the Memory stage. The CPU-SFRs CPUCON1, CP, SP, STKUN, STKOV, VECSEG, TFR, and PSW affect the overall CPU functioning while the C-SFRs IDX0, IDX1, QX1, QX0, DPP0, DPP1, DPP2 and DPP3 only affect the Decode, Address, and Memory stage when they are modified explicitly. If this kind of CSFR has been modified, the pipeline behavior depends on the instruction and addressing modes used to modify the CSFR. - In the case of modification of these CSFRs by "POP CSFR" or by instructions using the reg,#data16 addressing mode, a special mechanism is implemented to improve performance during the initialization. For further explanation, the instruction which modifies the CSFR can be called "instruction_modify_CSFR". This special case is detected in the Decode stage when the instruction_modify_CSFR enters the processing pipeline. Further on, instructions described in the following list are held in the decode stage. All other instructions are not held. - Instructions using long addressing mode (mem) - Instructions using indirect addressing modes ([Rw], ]Rw+]......), except JMPI and CALLI - ENWDT, DISWDT, EINIT - All CoXXX instructions If the CPUCON1, CP, SP, STKUN, STKOV, VECSEG, TFR, or the PSW are modified and the instruction_modify_CSFR reaches the execute stage, the pipeline is canceled. The modification affects the entire pipeline and the instruction prefetch. A clean cancel and restart mechanism is required to guarantee a correct instruction flow. In case of modification of IDX0, IDX1, QX1, QX0, DPP0, DPP1, DPP2 or DPP3 only the Decode, Address, and Memory stages are affected and the pipeline must not be canceled. The modification does not affect the instructions in the Address, Memory stage because they are not using this resource. Other kinds of instructions are held in the Decode stage until the CSFR is modified. The following example shows a case in which the pipeline is stalled. The instruction MOV R6,R1 after the MOV IDX1,#12 instruction which modifies the CSFR will be held in Decode Stage until the IDX1 register is updated. The next example shows an optimized initialization routine.
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Instruction Pipeline
In-1 In In+1 In+2 In+3 In+4 ........ MOV IDX1,#12 MOV R6,mem ADD R6,R1 MOV R3,[R0] ........
Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= MOV IDX1,#12 In-1 In-2 In-3 In-4
Tn+1
In+1= MOV R6,mem In= MOV IDX1,#12 In-1 In-2 In-3
Tn+2
In+1= MOV R6,mem
Tn+3
In+1= MOV R6,mem
Tn+4
In+1= MOV R6,mem
Tn+5
In+2= ADD R6,R1 In+1= MOV R6,mem
In= MOV IDX1,#12 In-1 In-2 In= MOV IDX1,#12 In-1 In= MOV IDX1,#12
In-1 In In+1 In+2 In+3 In+4
........ MOV IDX1,#12 MOV MAH,#23 MOV MAL,#25 MOV R3,#08 ........
Tn
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In= MOV IDX1,#12 In-1 In-2 In-3 In-4
Tn+1
In+1= MOV MAH,#23 In= MOV IDX1,#12 In-1 In-2 In-3
Tn+2
In+2= MOV MAL,#25 In+1= MOV MAH,#23 In= MOV IDX1,#12 In-1 In-2
Tn+3
In+3= MOV R3,#08 In+2= MOV MAL,#25 In+1= MOV MAH,#23 In= MOV IDX1,#12 In-1
Tn+4
In+4 In+3= MOV R3,#08 In+2= MOV MAL,#25 In+1= MOV MAH,#23 In= MOV IDX1,#12
Tn+5
In+5 In+4 In+3= MOV R3,#08 In+2= MOV MAL,#25 In+1= MOV MAH,#23
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Instruction Pipeline - For all the other instructions that modify this kind of CSFR, a simple stall and cancel mechanism guarantees the correct instruction flow. A possible explicit write-operation to this kind of CSFRs is detected on the Memory stage of the pipeline. The following instructions on the Address and Decode Stage are stalled. If the instruction reaches the execute stage, the entire pipeline and the Instruction FIFO of the IFU are canceled. The instruction flow is completely restarted.
In-1 In In+1 In+2 In+3 In+4 ........ MOV PSW,R4 MOV R6,R1 ADD R6,R1 MOV R3,[R0] ........ Tn+1
DECODE ADDRESS MEMORY EXECUTE WRITE BACK
In+1= MOV R6,R1 In= MOV PSW,R4 In-1 In-2 In-3
Tn+2
In+2= ADD R6,R1 In+1= MOV R6,R1 In= MOV PSW,R4 In-1 In-2
Tn+3
In+2= ADD R6,R1 In+1= MOV R6,R1
Tn+4
Tn+5
Tn+6
In+1= MOV R6,R1
In= MOV PSW,R4 In-1 In= MOV PSW,R4
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5
Interrupt and Exception Handling
The Interrupt and Exception Handler is responsible for managing all system and core exceptions. Four kinds of exceptions are executed in a similar manner: * * * * Interrupts generated by the Interrupt Controller ITC DMA transfers issued by the Peripheral Event Controller PEC. Software Traps caused by the TRAP instruction Hardware Traps issued by faults or specific system states
Normal Interrupt Processing The CPU temporarily suspends current program execution and branches to an interrupt service routine to service a device requesting an interrupt. The current program status (IP and PSW; in segmentation mode, also CSP) is saved in the internal system stack. A prioritization scheme with sixteen priority levels specifies the order for handling multiple interrupt requests. Software and Hardware Traps Trap functions are activated in response to special conditions that occur during the execution of instructions. A trap can also be caused externally by the Non-Maskable Interrupt pin, NMI. Several hardware trap functions are provided to handle erroneous conditions and exceptions that arise during program execution. Hardware traps always have the highest priority and cause immediate system response. The software trap function is invoked by the TRAP instruction that generates a software interrupt for a specified interrupt vector. For all types of traps, the current program status is saved in the system stack. Interrupt Processing via the Peripheral Event Controller (PEC) A faster alternative to normal interrupt processing uses the C166S V2 CPU's integrated Peripheral Event Controller (PEC) to service an interrupt requesting device. Triggered by an interrupt request, the PEC performs a single word or byte data transfer between any two memory locations. During a PEC transfer, the normal program execution of the CPU is halted. No internal program status information needs to be saved. The same prioritization scheme is used for PEC service as for normal interrupt processing.
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5.1 5.1.1
Interrupt System and Control General Interrupt System Structure
The C166S V2 CPU can provide up to 128 separate interrupt nodes that may be assigned to sixteen interrupt priority levels with four sub-priorities inside each level (group priority) for up to 64 interrupt nodes or with eight sub-priorities inside each level (group priority) in the case of more than 64 interrupt nodes. To support modular and consistent software design techniques, most sources of an interrupt or PEC request are supplied with separate interrupt control registers and interrupt vectors. The control register contains an interrupt request flag, an interrupt enable bit, and an interrupt priority of the associated source. Each source request is activated by one specific event, determined by the selected operating mode of the requesting device. In some cases, multi-source interrupt nodes are incorporated for efficient use of system resources. These nodes can be activated by various source requests. The C166S V2 CPU provides a vectored interrupt system. This system reserves specific vector locations in the memory space for the reset, trap, and interrupt service functions. Whenever a request occurs, the CPU branches to the location associated with the respective interrupt source. The reserved vector locations build a jump table in the address space of the C166S V2 CPU. All pending interrupt requests are arbitrated. The arbitration winner is sent to the CPU together with its priority level and action request. The CPU triggers the corresponding action based on the required functionality (normal interrupt, PEC, jump table cache, etc.) of the arbitration winner. An action request will be accepted by the CPU if the requesting source has a higher priority than the current CPU priority level and interrupts are globally enabled. If the requesting source has a lower (or equal) interrupt level priority than the current CPU task, it remains pending. The basic functionality of the interrupt and peripheral event controller can be seen in Figure 5-1:
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Interrupt and Peripheral Event Controller
Interrupt Request Lines
PEC Pointer
SRCP0 SRCP1 irq0 SRCP7 irq1 DSTP7 PECSEG7 DSTP0 DSTP1 PECSEG0 PECSEG1
C166S V2 CPU
irq2
irq3
Arbitration
Arbitr. Winner irq n-3 1) irq n-2 irq n-1 EOP INT 2) Request Control
PEC Request
Peripheral Event Controller (PEC)
Request Control
Injection Control
(CPU Action Request)
Injection Interface
Interrupt Handler
Interrupt Request Interrupt Request
Arbitration Control
(Interrupt Control Registers)
PEC Control
(PEC Control Registers)
Interrupt Handler Control
Fast Bank Switching BNKSEL0
OCE Injection Request & Control
OCE/ OCDS
irq0IC irq1IC
PECC0 PECC1
BNKSEL3
irq126IC EOPIC
PECC7 PECISNC
Interrupt Jump Table Cache FINT0CSP FINT0ADDR FINT1CSP FINT1ADDR
1) number of interrupt nodes n (upto 128) 2) End of PEC Interrupt (EOPINT) is connected to interrupt request line irq n-1. Therefore, only n-1 interrupt lines (irq n-2...0) are available for peripheral request handling.
Figure 5-1
Block Diagram of the Interrupt and PEC Controller
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5.1.2
Interrupt Arbitration
The C166S V2 interrupt arbitration system can handle interrupt requests from up to 128 sources. Interrupt requests may be triggered either by the C166S V2 peripherals or by external inputs. The "End of PEC" interrupt for supporting enhanced PEC functionality is connected internally to one interrupt request line. The arbitration process starts with an enabled interrupt request and stays active as long as an interrupt request is pending. If nothing is pending, the arbitration logic switches to the idle state to save power. Each interrupt request line is controlled by its interrupt control register xxIC (here and below `xx' stands for the mnemonic of the respective interrupt source). An interrupt request event sets the interrupt request flag in the corresponding interrupt control register (bit xxIC.xxIR). The interrupt request can also be triggered by the software if the program sets the respective interrupt request bit. This feature is specifically used by operating systems. If the request bit has been set and the corresponding interrupt request is enabled by the interrupt enable bit of the same control register (bit xxIC.xxIE), an arbitration cycle starts with the next clock cycle. However, if an arbitration cycle is currently in progress, the new interrupt request will be delayed until the next arbitration cycle. If an interrupt request (or PEC request) is accepted by the core, the respective interrupt request flag is cleared automatically. All interrupt requests pending at the beginning of a new arbitration cycle are considered simultaneously. Within the arbitration cycle, the arbitration is independent of the actual request time. C166S V2 uses a three-stage interrupt prioritization scheme for interrupt arbitration as shown in Figure 5-2.
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Interrupt Arbitration
OCDS break request OCDS or OCE Interrupt Request Lines
Hardware Traps
xxxxx (OCDS service request priority level)
xxxxx (request priority level)
CPU Arbitration
0xxxx (ILVL. PSW extended with 0 in MSB)
Request Lines Arbitration
xxxx (ILVL) + x.xx (XGLVL)
PEC/ Interrupt Handler
0xxxx (ILVL extended with 0 in MSB)
CPU Action Control
PSW
CPU
Stage 1: Compared 4-bit ILVL+ 2/3-bit XGLVL priority levels of interrupt sources (64/128 priority levels) Stage 2: 4-bit IRQ/PEC priority level compared with 5-bit OCDS priority level Stage 3: 5-bit request priority level compared with 4-bit PSW priority level
Figure 5-2
Interrupt Arbitration
The first arbitration stage compares the priority levels of interrupt request lines. The priority level of each requestor consists of interrupt priority level and group priority level. An interrupt priority level is programmed for each interrupt request line by the 4-bit bit field ILVL of the respective xxIC register. The group priority level is programmed for each interrupt request line by the 2-bit bit field GLVL--and, in the case of more than 64 interrupt nodes, by the extension bit GPX of the register xxIC. GPX and GLVL combined form the 3-bit (extended) group priority level XGLVL, controlling up to eight interrupt subpriorities within one of the sixteen interrupt levels. Note: All interrupt request sources that are enabled and programmed to the same interrupt priority level (ILVL) must have different group priority levels. Otherwise, an incorrect interrupt vector may be generated. The second arbitration stage compares the priority of the first stage winner with the priority of OCDS service requests. C166S V2 OCDS service requests bypass the first stage of arbitration and go directly to the CPU Action Control Unit. The CPU Action Control Unit disregards the group priority level of interrupt/PEC requests and deals only with interrupt priority levels (ILVL). For comparison with an OCDS service request priority programmed with a 5-bit value, the 4-bit ILVL of the interrupt/PEC request is extended to a 5-bit value with MSB=0. This means that any OCDS request with MSB=1 will always
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Interrupt and Exception Handling win the second stage arbitration. However, if there is a OCDS request with MSB=0 conflicting with the same priority interrupt/PEC request, the latter is sent to the CPU. On the third arbitration stage, the priority level of the second stage winner is compared with the priority of the current CPU task. An action request will be accepted by the CPU if the requesting source has a priority level higher than the current CPU priority level (bits ILVL of the PSW register) and for interrupt and PEC requests if they are globally enabled by the global interrupt enable flag IEN in PSW. The CPU denies all interrupt/PEC requests in case of a cleared IEN flag and an injection level between 0 to 15. To compare with the 5-bit priority level of the second stage winner, the 4-bit ILVL.PSW is extended to a 5-bit value with MSB=0. This means that any request with MSB=1 will always interrupt the current CPU task. If the requester has a priority level lower than or equal to the current CPU task, the request remains pending. Note: Priority level 0000B is the default level of the CPU. Therefore, a request on interrupt priority level 0000B will be arbitrated, but the CPU will never accept an action request on this level. However, every enabled interrupt request (including all denied interrupt requests as well as priority level 0000B requests) triggers a CPU wake-up from idle state independent of the setting of the global interrupt enable bit PSW.IEN. Both the OCDS break requests and the hardware traps bypass the arbitration scheme and go directly to the core.
5.1.3
Interrupt Control
All interrupt control registers are organized identically. The lower eight bits of an interrupt control register contain the complete interrupt control and status information of the associated source required during one round of prioritization (arbitration cycle). The upper eight bits of the respective register are reserved. All interrupt control registers are bit addressable and all bits can be read or written via software. Therefore, each interrupt source can be programmed or modified with just one instruction. In the case of reading the interrupt control registers with instructions that operate with word data types, the upper 7 bits (15...9) will return zeroes. It is recommended to always write zeroes to these bit positions. The layout of the interrupt control registers shown below is applicable to all xxIC registers.
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xxIC Interrupt Control Register
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
SFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
GPX xxIR xxIE rw rwh rw
ILVL rw
GLVL rw
Field GPX xxIR1)
Bits [8] [7]
Type Description rw rwh Group Priority Extension Defines the value of high-order group level bit Interrupt Request Flag 0 No request pending 1 This source has raised an interrupt request Interrupt Enable Control Bit (individually enables/disables a specific source) 0 Interrupt request is disabled 1 Interrupt request is enabled Interrupt Priority Level FH Highest priority level ... ... Lowest priority level 0H Group Priority Level 3H Highest priority level ... ... 0H Lowest priority level Extended Group Priority Level 7H Highest priority level ... ... 0H Lowest priority level
xxIE
[6]
rw
ILVL
[5:2]
rw
GLVL
[1:0]
rw
XGLVL
[8],[1:0]
1)
Bit xxIR supports bit-protection
The arbitration scheme allows nesting of up to fifteen interrupt service routines of different priority levels (Level 0 cannot be used; see note above). Note: To reduce power, the arbitration is stopped when no interrupt request is active.
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5.1.4
Interrupt Vector Table
The C166S V2 provides a vectored interrupt system. This system reserves the specific vector locations in the memory space for the reset, trap, and interrupt service functions. Whenever a request occurs, the CPU branches to the location associated with the respective interrupt source. This vector position directly identifies the source causing the request. Note: Class B hardware traps all share the same interrupt vector. The status flags in the Trap Flag Register (TFR) are used to determine which exception caused the trap. For details, see Section 5.3. The reserved vector locations are assembled into a vector table located in the address space of the C166S V2. The vector table contains the appropriate jump instructions that transfer control to the interrupt or trap service routines. These routines may be located anywhere within the address space. The location and organization of the vector table is programmable. The vector table can be located in all segments with exception of the reserved segment 191. The Vector Segment register VECSEG specifies the segment of the Vector Table. VECSEG Vector Segment Pointer
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
bSFR
8 0 r 7 6 5 4
Reset Value: xxxxH
3 2 1 0
VECSEG rwh
Field VECSEG
Bits [7:0]
Type Description rwh Segment number of the Vector Table
The reset value of VECSEG can be configured during system reset or can be set depending on the particular product. The C166S V2 supports the following reset values: - - - - Start from Internal Program Memory (C0'0000H) Start from Boot memory (BF'0000H) Start from external memory (00'0000H) Start from a segment specified from the system (xx'0000H)1)
The VECSC bit field of the CPUCON1 register controls the number of word locations separating two vectors. The space between two vectors can be programmed to 2, 4, 8, or 16 words.
1)
The current startup routine does not support this reset configuration.
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Interrupt and Exception Handling Each vector location has an offset address to the segment base address of the vector table. The address can be easily calculated. The segment part is given by the VECSEG register and the offset is the trap number shifted by the space programmed in the VECSC bit field. CPUCON1 CPU Control Register
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
SFR
8 0 r 7 0 r 6 5 4
Reset Value: 0000H
3 2 1 0 ZCJ rw
VECSC rw
WDT SGT INT BP CTL DIS SCXT rw rw rw rw
Field VECSC
Bits [6:5]
Type Description rw Scaling factor of Vector Table 00 Space between two vectors is 2 words 01 Space between two vectors is 4 words 10 Space between two vectors is 8 words 11 Space between two vectors is 16 words
Note: For a summary of the CPUCON1 register, please refer to Chapter 2.3.6.
5.1.5
Interrupt Jump Table Cache
The mechanism that uses the vector table location as the entry point for the interrupt service routines can be overwritten by the Interrupt Controller (ITC). For a very fast interrupt response time, the C166S V2 offers a new feature of the interrupt system-- Interrupt Jump Table Cache (also called "fast interrupt"). The ITC can transfer a 24-bit vector to the CPU that is used directly as a start address for the service routine. This feature skips the path through the vector table which normally saves the execution of at least one branch. Due to the random nature of interrupt requests, execution of these branches requires several CPU cycles, especially if memories with a high latency are used, such as DRAMs. Therefore, avoiding the vector table may significantly improve interrupt response time. However, the number of 24-bit vectors in the ITC is limited. Fast interrupt is available for two interrupt sources with interrupt priority levels greater than or equal to 12. The Interrupt Jump Table Cache skips the instruction fetches from the interrupt vector table and executes a direct jump to the interrupt service routines entry point. This feature is controlled by a set of two interrupt jump table cache registers (FINTxCSP, FINTxADDR) for each of the two jump table entries. Every interrupt jump table cache entry contains an enable bit, an associated arbitration priority level (ILVL and GLVL), and the 24-bit address of the interrupt service routine. Note that only the two lower bits of the interrupt priority level are selectable in the
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Interrupt and Exception Handling respective control registers. The two upper bits of the interrupt priority level are set to `11B', which limits the allowed interrupt priority level to be greater than or equal to 12. FINT0CSP Fast Interrupt Control Register 0
15
EN
XSFR
8 7 6 5 4
Reset Value: 0000H
3
SEG
14
0
13
0
12
GPX
11
10
9
2
1
0
ILVL
GLVL
rw
r
r
rw
rw
rw
rw
FINT1CSP Fast Interrupt Control Register 1
15
EN
XSFR
8 7 6 5 4
Reset Value: 0000H
3
SEG
14
0
13
0
12
GPX
11
10
9
2
1
0
ILVL
GLVL
rw
r
r
rw
rw
rw
rw
Field EN
Bits [15]
Type Description rw Fast Interrupt Enable 0 The interrupt jump table cache is disabled. No fast interrupt is used. 1 The interrupt jump table cache is enabled. A fast interrupt (direct jump to the interrupt service routine) is used instead of the normal fetch from the interrupt vector table. Group Priority Extension This bit enables group extension for fast interrupts. (hardwired to 0 for fewer than 64 interrupt nodes) Interrupt Priority Level This bit field selects the lower two bits of the interrupt priority level associated with this interrupt jump table cache entry. Note: The two upper bits of the interrupt priority level are set to `11B', which ends in an interrupt priority level greater than or equal to 12.
GPX
[12]
rw
ILVL
[11:10] rw
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Interrupt and Exception Handling Field GLVL Bits [9:8] Type Description rw Group Priority Level This bit field selects the group priority level of the associated interrupt jump table cache entry. Segment Number of Interrupt Service Routine This bit field specifies address bits 23:16 of the interrupt service routines entry point.
SEG
[7:0]
rw
FINT0ADDR Fast Interrupt Address Register 0
15 14 13 12 11 10 9 8
XSFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
0
ADDR
rw
r
FINT1ADDR Fast Interrupt Address Register 1
15 14 13 12 11 10 9 8
XSFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
0
ADDR
rw
r
Field ADDR
Bits [15:1]
Type Description rw Address of Interrupt Service Routine This bit field specifies address bits 15:1 of the interrupt service routine's entry point. Interrupt Service Routine Address Bit 0 LSB of the interrupt service routine's entry point address is 0 because of word alignment.
0
[0]
r
5.2 5.2.1
Status and Switch Context Control Interrupt Control Functions in the PSW
The Processor Status Word (PSW) is functionally divided into two parts: the lower byte of the PSW represents the arithmetic status of the CPU, the upper byte of the PSW controls the interrupt system of the C166S V2 CPU. Note: For a summary of the PSW register, please refer to Section 2.6.6
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15 14 13 12 11 IEN rw 10 HLD EN rw 9
bSFR
8 7 6 5 MUL IP r 4 E rwh
Reset Value: 0000H
3 Z rwh 2 V rwh 1 C rwh 0 N rwh
ILVL rwh
BANK rwh
USR1 USR0
rwh
rwh
Field ILVL
Bits
Type Description CPU Priority Level Lowest Priority 0H ... ... FH Highest Priority Interrupt/PEC Enable Bit (globally) 0 Interrupt/PEC requests are disabled 1 Interrupt/PEC requests are enabled Reserved for register file bank selection 00 Global register bank 01 Reserved 10 Local register bank 1 11 Local register bank 2
[15:12] rwh
IEN
[11]
rw
BANK
[9:8]
rwh
CPU Priority ILVL defines the current level for the CPU operation, thus, this bit field reflects the priority level of the currently executed routine. When the CPU enters an interrupt service routine this bit field is set to the priority level of the request that is being serviced. The previous PSW is saved in the system stack before entering interrupt service routine. To be serviced, any interrupt request must have a higher priority level than the current CPU priority level. Any request of the same or a lower level will not be acknowledged. The current CPU priority level may be adjusted via software to select interrupt request sources that can be serviced. PEC transfers do not really interrupt the CPU, but rather "steal" some CPU cycle, so PEC services do not influence the ILVL field in the PSW. Hardware traps set the CPU level to the maximum priority (15). Therefore, no interrupt or PEC requests will be acknowledged while an exception trap service routine is being executed. The TRAP instruction does not change the CPU level, so software trap service routines may be interrupted by higher requests. Register Bank BANK defines the currently used register bank for the CPU operation. When the CPU enters an interrupt service routine, this bit field is updated to select the register bank associated with the serviced request.
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Interrupt and Exception Handling Note: The TRAP instruction does not change the register bank. Note: Hardware traps always use the global register bank. Interrupt Enable bit IEN globally enables or disables interrupts and PEC operations. When IEN is cleared, no new interrupt requests are accepted by the CPU after IEN was set to 0. However, requests that have already entered the pipeline will be completed. If IEN is set to 1, then all interrupt sources are globally enabled. Note: To generate requests, interrupt sources must be also enabled by the interrupt enable bits in their associated control register. Note: Traps are non-maskable and, therefore, are not controlled by the IEN bit.
5.2.2
Saving the Status during Interrupt Service
Before an operating system or ITC can actually service a task switch request or interrupt, the CPU must save the current task status. The C166S V2 CPU saves the CPU status (PSW) along with the return address in the system stack. The return address defines the point at which the execution of the interrupted task is to be resumed after returning from the service routine. This return address is specified by the Instruction Pointer (IP) and, in the case of a segmented memory model, also by the Code Segment Pointer (CSP). Bit SGTDIS in the CPUCON1 register defines which memory model is used and, therefore, controls how the return address is stored. In the case of non-segmented mode, the system stack stores PSW first and then IP. In segmented mode, PSW is followed by CSP and the IP. This order optimizes the use of the system stack if segmentation is disabled. The CPU priority field (ILVL in PSW) is updated with the priority of the interrupt request that is to be serviced, so the CPU now executes on the new level. The BANK field in the PSW register is changed to select the register bank associated with the interrupt request. The associations between interrupt requests and register banks are programmed in the Interrupt Controller (ITC).
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.
Status of Interrupted Task SP
---1. System Stack before Interrupt Entry
SP
PSW IP
-2. System Stack after Interrupt Entry (Unsegmented)
PSW CSP IP
SP
3. System Stack after Interrupt Entry (Segmented)
Figure 5-3
Task Status Saved on the System Stack
After accepting an interrupt request, the C166S V2 CPU sends an acknowledge to the ITC that the requested interrupt is being serviced. The vector associated with the requesting source is loaded into the IP and CSP and the first instruction of the service routine is fetched. All other CPU resources, such as data page pointers and the context pointer, are not affected. When the CPU returns from the interrupt service routine (RETI is executed), the status information is popped from the system stack in reverse order. The status information contents depend on the SGTDIS bit value (see Figure 5-3).
5.2.3
Context Switching
An interrupt service routine usually saves all the registers it uses in the stack, and restores them before returning. The more registers a routine uses, the more time is wasted by saving and restoring. The C166S V2 CPU allows the complete bank of CPU registers (GPRs) to be switched, so the service routine executes within its own separate context. There are two ways to switch a context in the C166S V2 core (for details, see Section 2.4.3): 1. Switching Context by Changing the Selected Register Banks Selection of the register bank used in the interrupt task is programmed in the Interrupt Controller. During the execution of the interrupt entry procedure, the change of the register bank is automatically executed. After switching to one of the two local register banks, the service routine may now use its "own registers" directly. This local register bank is preserved when the service routine is terminated; thus, its contents are available on the next call. When switching to the global register bank, the service routine must also switch the context of the global register bank (see the next section) to get a private set of GPRs.
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Interrupt and Exception Handling 2. Switching Context of the Global Register Bank by Changing Context Pointer The C166S V2 CPU allows the complete global register bank of CPU registers (GPRs) to be changed with a single instruction; so, the service routine executes within its own separate context. The instruction "SCXT CP, #New_Bank" pushes the contents of the context pointer (CP) into the system stack and loads CP with the immediate value "New_Bank". The new CP value sets a new global register bank. The service routine may now use its "own registers". This global register bank is preserved when the service routine is terminated; thus, its contents are available for the next call. Before returning (RETI), the previous CP is simply popped from the system stack; thus, returning the registers to the original global register bank. Note: Resources used by the interrupting program must eventually be saved and restored, such as the DPPs and the registers of the MUL/DIV unit. There are certain timing restrictions during context switching that are associated with pipeline behavior. For details, see Section 2.4.3.2.
5.2.4
Fast Bank Switching
The interrupt handler of the C166S V2 CPU supports an additional enhanced feature (compared to other members of the C166 family) for normal interrupts called Fast Bank Switching. To speed up interrupt handling, the core can use fast General Purpose Register (GPR) bank switching for interrupts with an interrupt level greater or equal 12. For every arbitration priority level with ILVL = `15D'-`12D' and XGLVL = `7D'-`0D', the register bank can be selected via two bits. These bits are located in the two register bank selection registers BNKSELx (x = 0,..,3). The BNKSEL2 and BNKSEL3 registers are only implemented in configurations using the GPX extension bit. BNKSELx (x = 0... 3) Register Bank Selection Register x
15 14 13 12 11 10 9 8
XSFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
GPRSEL7 GPRSEL6 GPRSEL5 GPRSEL4 GPRSEL3 GPRSEL2 GPRSEL1 GPRSEL0 rw rw rw rw rw rw rw rw
Field GPRSELx (x = 0... 7)
Bits
Type Description Register Bank Selection 00 Global register bank 01 Reserved 10 Local register bank 1 11 Local register bank 2
[x+1:x] rw
Note: The GPRSELx value of the current triggered interrupt is automatically transferred into the Program Status Word (PSW).
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Interrupt and Exception Handling Table 5-1 identifies the arbitration priority level assignment to the respective bit fields within the four register bank selection registers: Table 5-1 Interrupt Priority Level (ILVL) 15 15 15 15 15 15 15 15 14 14 14 14 14 14 14 14 Register Bank Assignment Assigned Group Priority GPRSELx Level Register (XGLVL) 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Interrupt Priority Level (ILVL) Group Assigned Priority GPRSELx Register Level (XGLVL) 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
BNKSEL2.GPRSEL7 BNKSEL2.GPRSEL6 BNKSEL2.GPRSEL5 BNKSEL2.GPRSEL4 BNKSEL0.GPRSEL7 BNKSEL0.GPRSEL6 BNKSEL0.GPRSEL5 BNKSEL0.GPRSEL4 BNKSEL2.GPRSEL3 BNKSEL2.GPRSEL2 BNKSEL2.GPRSEL1 BNKSEL2.GPRSEL0 BNKSEL0.GPRSEL3 BNKSEL0.GPRSEL2 BNKSEL0.GPRSEL1 BNKSEL0.GPRSEL0
BNKSEL3.GPRSEL7 13 BNKSEL3.GPRSEL6 13 BNKSEL3.GPRSEL5 13 BNKSEL3.GPRSEL4 13 BNKSEL1.GPRSEL7 13 BNKSEL1.GPRSEL6 13 BNKSEL1.GPRSEL5 13 BNKSEL1.GPRSEL4 13 BNKSEL3.GPRSEL3 12 BNKSEL3.GPRSEL2 12 BNKSEL3.GPRSEL1 12 BNKSEL3.GPRSEL0 12 BNKSEL1.GPRSEL3 12 BNKSEL1.GPRSEL2 12 BNKSEL1.GPRSEL1 12 BNKSEL1.GPRSEL0 12
5.3
Traps
A software trap is initiated by the TRAP instruction. The TRAP instruction can call an interrupt service routine by its associated vector number. The trap number specified in the operand field of the trap instruction determines which vector location of the vector table will be used.
5.3.1
Software Traps
The TRAP instruction is used to cause a software call to an interrupt service routine. The trap number specified in the operand field of the trap instruction determines which vector location of the vector table will be used.
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Interrupt and Exception Handling The TRAP instruction has an effect similar to an interrupt request at the same vector. PSW, CSP (in segmentation mode), and IP are pushed into the system stack and then a jump is taken to the specified vector location. When a software trap is executed, the CSP for the trap service routine is loaded with the value of the VECSEG register. No Interrupt Request flags are affected by the TRAP instruction. The interrupt service routine called by a TRAP instruction must be terminated with a RETI (return from interrupt) instruction to ensure correct operation. Note: The CPU priority level and the selected register bank in PSW register are not modified by the TRAP instruction; so, the service routine is executed with the same priority level as the interrupt task. Therefore, the service routine entered by the TRAP instruction can be interrupted by other traps or by higher priority interrupts, unless triggered by a real hardware event. The service routine also works with an unchanged register bank. If the hardware triggers the same service routine, register bank can be selected by the ITC and may be different.
5.3.2
Hardware Traps
Hardware Traps are issued by faults or specific system states that occur during runtime (not identified at compile time). The C166S V2 CPU distinguishes eight different hardware trap functions. When a hardware trap condition has been detected, the CPU branches to the trap vector location for the respective trap condition. The instruction causing the trap event is completed before the trap handling routine is entered. Hardware traps are not-maskable and always have a priority higher than any other CPU task. If several hardware trap conditions are detected within the same instruction cycle, the highest priority trap is serviced. In case of a hardware trap, the injection unit injects an ITRAP instruction into the pipeline. The ITRAP instruction performs the following actions: - Pushes PSW, CSP (in segmented mode) and IP into the System Stack - Sets CPU level in the PSW register to the highest possible priority level, which disables all interrupts and DMA transfers - Selects the global register bank for the trap service routine - Branches to the trap vector location specified by the trap number of the trap condition The eight hardware functions of the C166S V2 CPU are divided in two classes: Class A and Class B. Class A traps are: - - - - External Non-Maskable Interrupts NMI Stack Overflow Stack Underflow Software Break
These traps share the same trap priority, but have an individual vector address.
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Interrupt and Exception Handling Class B traps are: - - - - Undefined Opcode Parity Fault Protection Fault Illegal Word Operand Access
The Class B traps share the same interrupt node and interrupt vector. The bit addressable Trap Flag Register (TFR) allows a trap service routine to identify the trap that caused the exception. The Trap Flag Register TFR Each trap function is indicated by a separate request flag. When a hardware trap occurs, the corresponding request flag in register TFR is set to 1. TFR Trap Flag Register
15 NMI rwh 14 13 12 11 0 r 10 0 r 9 0 r
bSFR
8 0 r 7 UND OPC rwh 6 0 r 5 0 r 4
Reset Value: 0000H
3 2 1 0 r 0 0 r
STK STK SOFT OF UF BRK rwh rwh rwh
PAR PRT ILL FLT FLT OPA rwh rwh rwh
Field NMI1)
Bits [15]
Type Description rwh Non maskable interrupt flag 0 No non-maskable interrupt detected 1 Non-maskable interrupt detected Stack overflow flag 0 No stack overflow event detected 1 Stack overflow event detected Stack underflow flag 0 No stack underflow event detected 1 Stack underflow event detected Software Break 0 No software break event detected 1 Software break event detected Undefined Opcode 0 No undefined opcode event detected 1 Undefined opcode event detected Parity Fault2) 0 No parity fault event detected 1 Parity fault event detected
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STKOF1)
[14]
rwh
STKUF1)
[13]
rwh
SOFTBRK1)
[12]
rwh
UNDOPC1)
[7]
rwh
PARFLT1)
[4]
rwh
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Interrupt and Exception Handling Field PRTFLT1) Bits [3] Type Description rwh Protection Fault 0 No protection fault event detected 1 Protection fault event detected Illegal word operand access 0 No illegal word operand access event detected 1 Illegal word operand access event detected
ILLOPA1)
[2]
rwh
1) 2)
This Bit supports bit-protection Parity fault on instruction fetch interface, usable for memories with parity check.
Note: The trap service routine must clear the respective trap flag; otherwise, a new trap will be requested after exiting the service routine. Setting a trap request flag by software causes the same effects as if it had been set by hardware. The reset functions (hardware, software, watchdog) may be also regarded as a type of trap. Reset functions have the highest priority (trap priority III). Class A traps have the second highest priority (trap priority II). At the third rank are Class B traps (trap priority I); thus, a Class A trap can interrupt a Class B trap. Table 5-2 Hardware Trap Summary Trap Flag Trap Vector RESET RESET RESET NMI STKOF STKUF SOFTBRK UNDOPC PARFLT PRTFLT ILLOPA NMITRAP STOTRAP STUTRAP SBRKTRAP BTRAP BTRAP BTRAP BTRAP Trap Number 00H 00H 00H 02H 04H 06H 08H 0AH 0AH 0AH 0AH Trap Priority III III III II.3 II.2 II.1 II.0 I I I I
Exception Condition Reset Functions: Hardware Reset Software Reset Watchdog Timer Overflow Class A Hardware Traps: Non-Maskable Interrupt Stack Overflow Stack Underflow Software Break Class B Hardware Traps: Undefined Opcode Parity Fault Protection Fault Illegal Word Operand Access Class A Trap
Class A traps are generated by the high priority system NMI or by special CPU events such as the software break, a stack overflow, or an underflow event. Class A traps are
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Interrupt and Exception Handling not used to indicate hardware failures. After a Class A event, a dedicated service routine is called to react to the events. Each Class A trap has its own vector location in the vector table. After finishing the service routine, the instruction flow must be further correctly executed. This explains why Class A traps cannot interrupt atomic/extend sequences and I/O accesses in progress. For example, an interrupted extend sequence cannot be restarted. All Class A traps are generated in the pipeline during the execution of instructions, with an exception of NMI, which is an asynchronous external event. It is not possible for two different instructions in the pipeline to generate traps in the same CPU cycle. Class A trap events can be generated only during the memory stage of execution. The execution of instructions which caused a Class A trap event is always completed. In the case of a Class A trap, the pipeline is directly canceled and the IP of the instruction following the last executed one is pushed into the stack. In the case of an atomic/extend sequence or I/O read access in progress, the execution continues till the sequence completion. Upon completion of the sequence, the IP of the instruction following the last one executed is pushed into the stack. Therefore, in the case of a Class A trap, the stack always contains the IP of the first not-executed instruction in the instruction flow. Note: The Branch Folding Unit allows an execution of branch instructions in parallel with the preceding instruction. The pre-processed branch instruction is combined with the preceding instruction. The branch is executed together with the instruction which caused the Class A trap. The IP of the first following not-executed instruction in the instruction flow is then pushed on the stack. If more than one Class A trap occurs at a same time, they are prioritized internally. The NMI trap has the highest priority and the software break has the lowest. Note: In the case of two different Class A traps occurring simultaneously, both trap flags are set. The IP of the instruction following the last one executed is pushed into the stack. The trap with the higher priority is executed. After return from the service routine, the IP is popped from the stack and immediately pushed again because of the other pending Class A trap (unless the trap related to the second trap flag in TFR has been cleared by the first trap service routine). Class B Trap Class B traps are generated by unrecoverable hardware failures. In the case of a hardware failure, the CPU must immediately start a failure service routine. Class B traps can interrupt an atomic/extend sequence and an I/O read access. After finishing the Class B service routine, a restoration of the interrupted instruction flow is not possible. All Class B traps have the same priority (trap priority I). When several Class B traps become active at the same time, the corresponding flags in the TFR register are set and the trap service routine is entered. Because all Class B traps have the same vector, the priority of service of simultaneously occurring Class B traps is determined by the software in the trap service routine.
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Interrupt and Exception Handling The Parity Fault is an asynchronous external event while all other Class B traps are generated in the pipeline during the execution of instructions. It is not possible for two different instructions in the pipeline to generate Class A and Class B traps in the same CPU cycle. Class B trap events can be generated only during memory stage execution. Instructions which caused a Class B trap event are always executed. In the case of a class B trap, the pipeline is directly canceled and the IP of the instruction following the one which caused the trap is pushed on the stack. Therefore, the stack always contains the IP of the first following not-executed instruction in the instruction flow. Note: The Branch Folding Unit allows the execution of branch instructions in parallel with the preceding instruction. The pre-processed branch instruction is combined with the preceding instruction. The branch is executed together with the instruction causing the Class B trap. The IP of the first following not-executed instruction in the instruction flow is pushed into the stack. During execution of a Class A trap service routine, any Class B trap will not be serviced until the Class A trap service routine is exited with a RETI instruction. In this case, the Class B trap condition is stored in the TFR register, but the IP value of the instruction which caused this trap will be lost. Note: If a Class A trap occurs simultaneously with a Class B trap, both trap flags are set. The IP of the instruction following the one which caused the trap is pushed into the stack, and the Class A trap is executed. If this occurs during execution of an atomic/extend sequence or I/O read access in progress, then the presence of the Class B trap breaks the protection of atomic/extend operations and the class A trap will be executed immediately without waiting for the sequence completion. After return from the service routine, the IP is popped from the system stack and immediately pushed again because of the other pending Class B trap. In this situation, the restoration of the interrupted instruction flow is not possible. * External NMI Trap: Whenever a high to low transition on the dedicated external NMI pin (Non-Maskable Interrupt) is detected, the NMI flag in register TFR is set and the CPU will enter the NMI trap routine. * Stack Overflow Trap: Whenever the stack pointer is implicitly decremented and the stack pointer is equal to the value in the stack overflow register STKOV, the STKOF flag in register TFR is set and the CPU will enter the stack overflow trap routine. * Stack Underflow Trap: Whenever the stack pointer is implicitly incremented and the stack pointer is equal to the value in the stack underflow register STKUN, the STKUF flag is set in register TFR, and the CPU will enter the stack underflow trap routine. * Software Break Trap: When the instruction currently being executed by the CPU is a SBRK instruction, the SOFTBRK flag is set in register TFR and the CPU enters the software break debug routine. The flag generation of the software break instruction can be disabled by an On-chip Emulation Module. In this case, the instruction only breaks the instruction flow and signals this event to the debugger. The flag is not set and the trap will not be executed.
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Interrupt and Exception Handling * Undefined Opcode Trap: When the instruction currently being decoded by the CPU does not contain a valid C166S V2 CPU opcode, the UNDOPC flag is set in register TFR and the CPU enters the undefined opcode trap routine. The instruction that causes the undefined opcode trap is executed as a NOP. * Parity Fault Trap: When a parity error is detected in the system, the PARFLT flag is set in register TFR and the CPU enters the parity fault trap routine. For the C166S V2 CPU, the parity fault is an asynchronous system event. There is no link between the fault and the instruction flow itself. * Protection Fault Trap: Whenever one of the special protected instructions is executed where the opcode of that instruction is not repeated twice in the second word of the instruction and the byte following the opcode is not the complement of the opcode, the PRTFLT flag in register TFR is set and the CPU enters the protection fault trap routine. The protected instructions include DISWDT, EINIT, IDLE, PWRDN, SRST, ENWDT and SRVWDT. The instruction that causes the protection fault trap is executed like a NOP. * Illegal Word Operand Access Trap: Whenever a word operand read or write access is attempted to an odd byte address, the ILLOPA flag in register TFR is set and the CPU enters the illegal word operand access trap routine.
5.4
Peripheral Event Controller
The Peripheral Event Controller (PEC) makes a decision about the CPU action required to manage an interrupt request. It may be either normal interrupt service or fast data transfer between two memory locations. The C166S V2 PEC controls eight fast data transfer channels. If normal interrupt is requested, the CPU temporarily suspends the current program execution and branches to an interrupt service routine. The current program status and context must be preserved. If a PEC channel is selected for servicing an interrupt request, a single word or byte data transfer between any two memory locations is to be performed. During a PEC transfer, the normal program execution of the CPU is halted. No internal program status information needs to be saved. The PEC transfer is the fastest possible interrupt response. In many cases, a PEC transfer is sufficient to service the peripheral request (serial channels, for example). The PEC channels can perform the following actions: * Byte or word transfer * Continuous data transfer * PEC channel-specific interrupt request upon data transfer completion or common for all channels "End of PEC" interrupt for enhanced handling * Automatic increment of source or/and destination pointers with support of memory to memory transfer Note: PEC transfer is executed if its priority level is higher than current CPU priority level.
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5.4.1
PEC Control Registers
Each PEC channel is controlled by the respective PEC channel Control register (PECCx) and a set of source and destination pointers (SRCPx, DSTPx and PECSEGx), where `x' stands for the PEC channel number. The PECCx registers control the arbitration priority level assignment to the PEC channels and the action to be performed. PECCx PEC Channel Control Register (x=7-0)
15 0 r 14 EOP INT rw 13 12 11 CL rw 10 INC rw 9 8 BWT rw
SFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
PLEV rw
COUNT rwh
Field EOPINT
Bits [14]
Type Description rw End of PEC Interrupt Selection 0 End of PEC interrupt with the same level as the PEC transfer is trigger 1 End of PEC interrupt is serviced by a separate interrupt node with programmable interrupt level (EOPIC) and interrupt sharing control register (PECISNC) PEC Level Selection This bit field controls the PEC channel assignment to an arbitration priority level. (see section below) Channel Link Control 0 PEC channels work independently 1 Pairs of PEC channels are linked together rw Increment Control (Modification of source and destination pointer after PEC transfer) 00 No modification 01 Increment of destination pointer DSTPx by 1 (BWT = 1) or by 2 (BWT = 0) 10 Increment of source pointer SRCPx by 1 (BWT = 1) or by 2 (BWT = 0) 11 Increment of destination pointer DSTPx and source pointer SRCPx by 1 (BWT = 1) or by 2 (BWT = 0)
PLEV
[13:12] rw
CL
[11]
[10:9]
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Interrupt and Exception Handling Field BWT Bits [8] Type Description rw Byte/Word Transfer Selection 0 Transfer a word 1 Transfer a byte PEC Transfer Count Counts PEC transfers and influences the channels action (see section below)
COUNT
[7:0]
rwh
The Byte/Word Transfer bit (BWT) of the PECCx register determines if a byte or a word is to be moved during a PEC service cycle and defines an increment step size for the pointer(s) to be modified. The PEC Transfer Count field (COUNT) of the PECCx directly controls the action of the respective PEC channel. The contents of the bit field COUNT may specify a certain number of PEC transfers, unlimited transfers, or no PEC service at all. - If the PEC transfer counter COUNT value is set to 00H, the normal interrupt requests are processed instead of PEC data transfers and the corresponding PEC channel remains idle. - Continuous data transfers are selected by setting the bit field COUNT to FFH value. In this case, COUNT is not decremented by the transfers and the respective PEC channel can serve unlimited number of PEC requests until it is modified by the program. - If the bit field COUNT is set to service a specified number of requests by the respective PEC channel, it is decremented with each PEC transfer and the request flag is cleared to indicate that the request has been serviced. When COUNT reaches 00H, it immediately activates the interrupt service routine that has the same priority level (EOPINT = 0) or triggers the "End of PEC" interrupt with a different priority level (EOPINT = 1). When COUNT is decremented from 01H to 00H after a data transfer, the request flag will be cleared if EOPINT is set to 1. If EOPINT is 0, the request flag will not be cleared and another interrupt request will be generated on the same priority level. The respective PEC channel remains idle and the associated interrupt service routine is activated instead of PEC transfer because COUNT contains the 00H value. (see Section 5.4.3). The EOPIC register is the interrupt control register of the End Of PEC interrupt. The Register PECISNC contains flags of the "End of PEC" interrupt node. This node is used when enhanced "End of PEC" interrupt feature was invoked and control bit EOPINT is set to 1 in the corresponding PECCx. Figure 5-4 shows the usage of the "End of PEC" interrupt subnode:
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Interrupt and Exception Handling EOPIC Interrupt Control Register1)
15 0 r
1)
bESFR
9 0 r 8 7 6 5 4
Reset Value: 0000H
3 2 1 0
14 0 r
13 0 r
12 0 r
11 0 r
10 0 r
GPX EOP EOP IR IE rw rwh rw
ILVL rw
GLVL rw
The EOPIC register is assigned to one of the interrupt nodes. The assignment is product specific.
Field GPX EOPIR1)
Bits [8] [7]
Type Description rw rwh Group Priority Extension Defines the value of high-order group level bit Interrupt Request Flag 0 No request pending 1 The source has raised an interrupt request Interrupt Enable Control Bit 0 Interrupt request is disabled 1 Interrupt request is enabled Interrupt Priority Level FH Highest priority level ... ... Lowest priority level 0H Group Priority Level 3H Highest priority level ... ... 0H Lowest priority level Extended Group Priority Level 7H Highest priority level ... ... 0H Lowest priority level
EOPIE
[6]
rw
ILVL
[5:2]
rw
GLVL
[1:0]
rw
XGLVL
[8],[1:0]
1)
Bit EOPIR supports bit-protection
PECISNC PEC Interrupt Sub Node Control
15 14 13 12 11 10 9 8
bSFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
C7IR C7IE C6IR C6IE C5IR C5IE C4IR C4IE C3IR C3IE C2IR C2IE C1IR C1IE C0IR C0IE
rwh
rw
rwh
rw
rwh
rw
rwh
rw
rwh
rw
rwh
rw
rwh
rw
rwh
rw
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Interrupt and Exception Handling Field CxIR Bits Type Description Interrupt Sub Node Request Flag of PEC Channel x 1) 2) 0 No special end of PEC interrupt request is pending for PEC channel x 1 PEC channel x has raised an end of PEC interrupt request Interrupt Sub Node Enable Control Bit of PEC Channel x 1) 3) (individually enables/disables a specific source) 0 End of PEC interrupt request of PEC channel x is disabled 1 End of PEC interrupt request of PEC channel x is enabled
15, 13, rwh 11, 9, 7, 5, 3, 1
CxIE
14, 12, rw 10, 8, 6, 4, 2, 0
1) 2)
3)
x = 7...0 NOTE: The "End of PEC" sub-node interrupt request flags are not cleared by hardware when entering the interrupt service routine (interrupt has been accepted by the CPU), unlike the interrupt request flags of the interrupt nodes (request flags xxIC.xxIR). The interrupt service routine must check the request flags and clear them before executing the RETI instruction. It is recommended to clear an interrupt request flag (CxIR) before setting the respective enable flag (CxIE). Otherwise, former requests still pending will immediately trigger an interrupt request after setting the enable bit.
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PECISNC
C7IR C7IE C6IR C6IE C5IR C5IE C4IR C4IE C3IR C3IE C2IR C2IE C1IR C1IE C0IR C0IE
15 0
Interrupt Request Pulse Generator
EOPIC
0
15
0
0
0
0
0
0
GPX
EOP EOP IE IR
ILVL
GLVL
0
87
Figure 5-4
End of PEC Interrupt Sub Node
Table 5-3 summarizes the values the bit field COUNT and the corresponding PEC channel actions.
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Interrupt and Exception Handling Table 5-3 Previous COUNT Field Value FFH FEH...02H 01H PEC Channel Actions Modified COUNT Field Value FFH FDH...01H 00H Action of PEC Channel and Comments Move a Byte/Word Continuous transfer mode; COUNT is not modified Move a Byte/Word and decrement COUNT Move a Byte/Word Depending on bit EOPINT, one of two different actions are taken: EOPINT = 0 (compatible mode) The service request flag (xxIR) of the respective interrupt remains set (it is cleared for all other COUNT values). Therefore, an additional interrupt request is triggered on the next arbitration cycle with a COUNT field value of `00H' (see next raw) EOPINT = 1 The service request flag (xxIR) of the respective interrupt is cleared. Additionally, the interrupt request flag of the EOP sub node (PECISNC.CxIR) is set. Furthermore, the interrupt request flag of the end of PEC interrupt node (EOPIC.EOPIR) is automatically set if the sub node request is enabled (PECISNC.CxIE = 1). (see also Section 5.4.3) No PEC action A normal interrupt is requested instead of a PEC data transfer (see also Section 5.4.3).
00H
00H
The Increment Control Field (INC) of the PECCx register defines when ether one or both of the PEC pointers must be incremented after the PEC transfer. If the pointers are not to be modified (INC=`00'), the respective channel will always move data from the same source to the same destination. Channel Link Mode (CL bit) Channel linking allows to perform PEC data transfers via a pair of two PEC channels, that are switched rotationaly, to provide the possibility of data chaining. The linked transfer is in principal the same as described for standard PEC but if the transfer of a linked channel has finished by decrementing the transfer count to zero the PEC controller automatically switches to the partner channel of the pair. While the data
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Interrupt and Exception Handling transfers are then controlled by the partner channel the finished channel can be reconfigured. The termination of the transfers of a linked channel is indicated by the triggering of an interrupt. If the channel link bit CL of the active channel or the EOPINT flag is set a End of PEC interrupt is called. Otherwise, the standard interrupt connected to the even channel is requested. The switch to the PEC channel partner is only possible if channel linking is enabled by setting the PECCx.CL bit of the current channel x. If for a channel the link bit is set but its count value is zero no switch is performed but the normal interrupt of the PEC channel calling node is requested when a new interrupt request occurs for the corresponding node. So the complete linked transfer is terminated if either in the active channel the count value is 0 or the CL flag is 0. Possible channel pairs are only the combinations of channels 0/1, 2/3, 4/5 and 6/7. The PEC channel assignment of the odd numbered channels is ignored if at least one of the channel linking bits (CL) of the channel pair is set. This means an interrupt request connected to the odd channel triggers only the standard interrupt, but no PEC transfer. So, the channel pair is assigned to the interrupt and group level of the even numbered channel partner. After the first initialization for linked transfer the transfer is started with the even numbered channel. The channels toggle as long as CL bit of the currently active channel is set on the transition of the PEC transfer count value from 1 to 0. The even channel is automatically selected if both CL flags are 0 or both transfer counts are 0. In all other cases the last active channel stays selected. A reset of the CL bits during a programmed channel link mode may cause a corruption of the sequence. A chained PEC sequence should be programmed so that as long the sequence is not finished, the CL bit is set, together with a new transfer count value. For the transfer before the last transfer, the called END of PEC interrupt routine should not reconfigure the count value and should not reset the CL bit. The last transfer channel should not have the CL bit set. So, at the end of the complete transfer, either a standard or an END of PEC trap can be selected by the EOPINT bit of the last channel.
5.4.2
The PEC Source and Destination Pointer
The PEC channels source and destination pointers specify the locations between which the data is to be moved. All pointers are 24-bits wide. The 24-bit source address is stored in the register SRCPx (lower 16 bits of address) and in the high byte of register PECSEGx (highest 8 address bits).
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PECSEGx
SRCSEGx
15 87
DSTSEGx
0
SRCPx
DSTPx
SRCPx
15 0 15
DSTPx
0
Source Pointer
23 16 15 0 23
Destination Pointer
16 15 0
Segment Address
Segment Offset
Segment Address
Segment Offset
Data Transfer
x = 7...0, depending on PEC channel number Figure 5-5 PEC Pointer Address Handling
The 24-bit destination address is stored in the register DSTPx (lower 16 bits of address) and in the low byte of register PECSEGx (highest 8 address bits). Only the lower 16 bits of the PEC address pointers (segment offset) can be modified (incremented) by the PEC transfer mechanism. The highest 8 bits, which represent the segment number, are not modified by hardware. Therefore, the PEC pointers may be incremented within the address space of one segment and may not cross the segment border. If the offset address pointer gets the `FFFFH' value in the case of byte transfers (BWT = 1) or `FFFEH' in the case of word transfers (BWT = 0), the next increment will be disregarded. The address register will keep one of these maximum values and no overflow will happen. The described behavior protects the memory from unintentional overwriting. No explicit error event is generated by the system in case of address pointer(s) saturation; therefore, it is the user's responsibility to prevent this condition. Note: PEC data transfers do not use the data page pointers DPP3...DPP0. Note: If a word data transfer is selected for a specific PEC channel (BWT = 0), the respective source and destination pointers must both contain a valid word address
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Interrupt and Exception Handling that points to an even byte boundary. Otherwise, the Illegal Word Access trap will be invoked when this channel is used.
SRCPx PEC Source Pointer (x=7-0)
15 14 13 12 11 10 9
XSFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
SRCPx rwh
Field SRCPx
Bits [15:0]
Type Description rwh Source Pointer Address of Channel x Source Address bits 15-0
DSTPx PEC Destination Pointer (x=7-0)
15 14 13 12 11 10 9 8
xSFR
7 6 5 4
Reset Value: 0000H
3 2 1 0
DSTPx rwh
Field DSTPx
Bits [15:0]
Type Description rwh Destination Pointer Address of Channel x Destination Address bits 15-0
PECSEGx PEC Segment Pointer (x=7-0)
15 14 13 12 11 10 9
xSFR
8 7 6 5 4
Reset Value: 0000H
3 2 1 0
SRCSEGx rw
DSTSEGx rw
5.4.3
PEC Handler Interrupt Actions Summary
As described above, two different kinds of interrupts can be triggered by the PEC handler depending on the status of the bitfield COUNT.
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Interrupt and Exception Handling Field SRCSEGx DSTSEGx Bits [15:8] [7:0] Type Description rw rw Source Pointer Segment Address of Channel x Source Address bits 23-16 Destination Pointer Segment Address of Channel x Destination Address bits 23-16
* PEC channel is enabled1) and the bit field COUNT has a value higher than `01H'. a) Control bit EOPINT = 0 or 1 ACTIONS: - PEC request is proceeded - No other interrupt activity * PEC channel is enabled and the bit field COUNT gets a decrement from `01H' to `00H' triggered by a service request. a) Control bit EOPINT = 0 (compatible with C166) ACTIONS: - PEC request is proceeded - Interrupt request flag (xxIR) of the requesting interrupt node (arbitration winner) is not cleared, participates on the next arbitration cycle, and triggers a normal interrupt on the same level as the PEC request is served. b) Control bit EOPINT = 1 (enhanced end of PEC interrupt feature) ACTIONS: - PEC request is proceeded - Interrupt request flag (xxIR) of requesting interrupt node (arbitration winner) is cleared and will not trigger more actions. - Interrupt request flag of the end of PEC interrupt subnode will be set (PECISNC.CxIR = 1) - If the respective interrupt enable flag of the end of PEC interrupt subnode was set before by software (PECISNC.CxIE = 1), an end of PEC interrupt is requested (EOPIC.EOPIR = 1). This end of PEC interrupt participates on the next arbitration cycle with its priority (selected via EOPIC.ILVL and EOPIC.GLVL), if this interrupt source was enabled before by software (EOPIC.EOPIR = 1). With this behavior, an end of PEC interrupt can be triggered on a level lower than the respective PEC requests have been serviced. * PEC channel is disabled if the bit field COUNT is cleared (either by hardware or by software).
1)
Every PEC channel is automatically enabled when its COUNT value is greater than 00H.
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Interrupt and Exception Handling a) Control bit EOPINT = 0 or 1 ACTIONS: - A normal interrupt service routine is requested on the PEC channel priority level.
5.4.4
PEC Channel Assignment and Arbitration
The C166S V2 PEC channels can be assigned to a certain arbitration priority level. All requests with interrupt priority levels 8 to 15 and group levels 0 to 3 can be associated with the PEC functionality (eight PEC channels in total). The group extension is not supported for PEC requests, because the 8 PEC channels are assigned to two interrupt levels for compatibility to the C16x family. The following mechanism shows how to program the bit field PECCx.PLEV to set up a link to a certain interrupt priority level and a group priority level:
PEC Channel x is linked to: Interrupt priority level (in IC register): (1, ~PLEV.1, ~PLEV.0, x.0) Extended Group priority level: (0, x.1, x.0)
For an easier understanding of this formula, Table 5-4 lists all possible combinations.
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Interrupt and Exception Handling Table 5-4 PEC Channel Assignment PEC Channel x Arbitration Priority Level Interrupt Priority Level xxIC.ILVL 11 11 11 11 10 10 10 10 9 9 9 9 8 8 8 8 PEC Channel x
Arbitration Priority Level Interrupt Priority Level xxIC.ILVL 15 15 15 15 14 14 14 14 13 13 13 13 12 12 12 12
Group PLEV Ch Priority Level xxIC.XGLVL 3 2 1 0 3 2 1 0 3 2 1 0 3 2 1 0 01 00 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Group PLEV Ch Priority Level xxIC.XGLVL 3 2 1 0 3 2 1 0 3 2 1 0 3 2 1 0 11 10 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
All interrupt requests not assigned to a PEC channel go directly to the interrupt handler.
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5.5
CPU Action Control Unit
The CPU Action Control Unit multiplexes interrupt/PEC requests with OCDS requests and forwards them to the CPU demanding the corresponding action. It also routes request acknowledges and denies from the core to the corresponding requester. The OCDS requests have programmable priority levels. If another interrupt request that has won an arbitration conflicts with an OCDS request, the one with the higher priority will trigger the CPU action first. However, if both requests (Interrupt/PEC and OCDS) have the same priority level, the interrupt/PEC request wins. The OCDS break request is sent directly from the OCDS module to the CPU (where it is prioritized) and ignores the CPU Action Control Unit (or any other module of the interrupt and Peripheral Event Controller).
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External Bus Controller
6
6.1
External Bus Controller
Introduction
Although the C166S V2 products provide a powerful set of on-chip peripherals and onchip program and data memories, these internal units only cover a small fraction of the C166S V2s address space of up to 16 MByte. The external bus interface allows access to external1) peripherals and additional volatile and non-volatile memories. The external bus interface provides a number of configurations, so it can be tailored to fit perfectly into a given application system. Accesses to external memories or peripherals are executed by the integrated External Bus Controller (EBC). The function of the EBC is controlled via a set of configuration registers. The basic behavior can be programmed via the mode selection registers EBCMODx. The EBC supports up to eight external chip select channels. Each of these chip select signals is programmable via a set of registers. The FCONCSx registers specify the external bus cycles in terms of address (mux/demux), data (16-bit/8-bit), chip select enable and READY control. The timing of the bus access is controlled by the timing configuration registers TCONCSx, which specify the length of the different access phases. All these parameters are used for accesses within a specific address area which is defined via the corresponding address select register ADDRSELx. The seven register sets FCONCS1/TCONCS1/ADDRSEL1 to FCONCS7/TCONCS7/ ADDRSEL7 define seven independent `address windows', while all external accesses outside these windows are controlled via the registers FCONCS0 and TCONCS0. Two additional chip select channels with fixed address ranges are defined for the startup and the monitor memory. The external bus timing is related to the reference clock output CLKOUT. All bus signals are generated in relation to the rising edge of this clock. This behavior eases the timing specification drastically and allows high EBC operating frequencies above 100 MHz. The external bus protocol is compatible with the C16x ones. However, the external bus timing is improved in terms of wait state granularity. Note: For supporting these improvements, an extended configuration scheme compared to the C16x is defined. The C16x registers SYSCON and BUSCONx are no longer used. In principle the configuration of the external bus controller is done during the application initialization. Therefore, only some initialization code has to be adapted for using the C166S V2 EBC module instead of the C16x external bus controller.
1)
C166S V2:'External' means off-chip However, modules like customer ASIC, startup memory and additional peripherals and memories can be connected on-chip to the external bus module as well. These modules are from the controller sub-system point of view also external, but on-chip.
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6.2
Timing Principles
The EBC supports four different access types. Reads and Writes in multiplexed and demultiplexed mode. Multiplexed mode means that the data bus is used in a `timemultiplex' for address (the 16 LSBs) and for data. In demultiplexed mode the data bus is used for data only and an additional 16 bit address bus is available. Naming Conventions Address Latch Enable (high active) indicates that the applied address is valid * WR/ Write Strobe (low active)/ WRL Write Low Byte Strobe (low active) configured either to a general write request or a write request for the low byte (see Table 6-1) * BHE/ Byte High Enable (low active)/ Write High Byte Strobe (low active) WRH configured either to an enable for the high byte or a write request for the high byte (see Table 6-1) Read Strobe (low active) * RD * READY Ready to indicated end of actions (programmable polarity) * ADDR Address Bus split to a part [23:16] and [15:0] * DATA Data Bus [15:0] or shared Data/Address [15:0] Bus * HOLD Hold input for foreign bus requests (low active) Hold Acknowledge (low active) * HLDA master output to grant bus / slave input * BREQ Bus Request (low active) Table 6-1 low write write Write Configurations (see Chapter 6.3.2) general write configuration WR inactive active active active BHE don't care inactive active active ADDR[0] 0/1 0 1 0 separated byte low/high writes WRL inactive active inactive active WRH inactive inactive active active ADDR[0] 0/1 0/1 0/1 0/1 high write write * ALE
written byte
The timings of the external bus can be split up into six phases:
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External Bus Controller Figure 6-1 Demultiplexed Bus Read
a ALE b c d e f
ADDR, CS
valid
RD
read DATA clock cycles needed bits 0-3 1-2 21 0-3 2 0-1 1 1-32 5
valid 0-3 2rd 2wr
Figure 6-2
Demultiplexed Bus Write
a ALE b c d e f
ADDR, CS
valid
WR
write DATA clock cycles needed bits 0-3 1-2 2 1 0-3 2 0-1 1
valid 1-32 5 0-3 2rd 2wr
* * * * * *
a phase: b phase: c phase: d phase: e phase: f phase:
addresses valid, ALE high, no command. CS switch tristate wait states addresses valid, ALE high, no command. ALE length addresses valid, ALE low, no command. R/W delay write data valid, ALE low, no command. Data valid for write cycles command (read or write) active. Access time command inactive, address hold. Read data tristate time, write data hold time
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External Bus Controller Figure 6-3 Multiplexed Bus Read
a ALE b c d e f
ADDR, CS
valid
RD
read DATA
addr valid
data in valid
clocks needed bits
0-3 1-2 2 1
0-3 2
0-1 1
1-32 5
0-3 2rd
Figure 6-4
Multiplexed Bus Write
a b c d e f
ALE
ADDR, CS
valid
WR
write DATA
address valid
data out valid
next address
clocks needed bits
0-3 1-2 0-3 21 2
0-1 1
1-32 5
0-3 2wr
* * * *
addresses valid, ALE high, no command. CS switch tristate wait states addresses valid, ALE high, no command. ALE length addresses valid, ALE low, no command. Address hold, R/W delay address tristate for read cycles, data valid for write cycles, ALE low, no command * e phase: command (read or write) active. Access time * f phase: command inactive, address hold. Read data tristate time, write data hold time.
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a phase: b phase: c phase: d phase:
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External Bus Controller
6.2.1
A Phase
The A phase can take 0-3 clocks. It is used to tristate the databus drivers activated in the previous cycle (tristate wait states after CS switch). Phase A cycles are not inserted in every access cycle but only when changing the CS. If an access using one chipselect CSx was finished and the next access with a different chipselect CSy is started then Phase A cycles are performed according to the PHA bits set for the first chipselect CSx. This feature is used to optimize wait states with devices having a long turn off delay at their databus drivers like EPROM and FLASH. The A Phase cycles are inserted while the addresses and ALE of the next cycle are already applied. If there are idle cycles in between two accesses these clock cycles are taken into account and the A Phase is shortened accordingly. For example if there are three tristate cycles programmed and two idle cycles occurred then the A Phase takes only one clock cycle.
6.2.2
B Phase
The B phase can take 1-2 clocks. It is used for selecting devices and registers before giving a command and to define the length of the active ALE. In multiplexed bus mode the address is applied on the data bus for latching.
6.2.3
C Phase
The C phase is similar to the A and B phases but ALE is already low. It can take 0-3 clock cycles. In multiplexed bus mode the address is held for being latched safely. Phase C cycles can be used to delay the command signals (RW delay).
6.2.4
D Phase
The D phase can take 0-1 clocks. It is used to tristate the address on the multiplexed bus when a read cycle is performed. For all write cycles it is used to have the data valid on the bus before the command is applied.
6.2.5
E Phase
The E phase is the command respectively access phase and takes 1-32 clocks. Read data is fetched, write data is put onto the bus; the command signals are active. Read data is registered with the terminating clock cycle of this phase. The READY function is lengthening this phase, too (see Table 6.3.6). READY controlled access cycles have a random cycle time.
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6.2.6
F Phase
The F phase can take 0-3 clocks. Addresses and write data are held while the command is inactive. The number of wait states being inserted at the F phase is programmable independently for read and write accesses. The F phase is used for data reads to program tristate wait states on the bidirectional data bus in order to avoid bus conflicts.
6.3 6.3.1
Functional Description Configuration Register Overview
The EBC registers are functionally split up into three groups: * EBC mode registers that have influence on global functions. * Chip select related registers to configure the functionality, timing and size of the chipselect windows. * Startup and Monitor Memory registers to control the access to these dedicated memories. CS0 is the default chip select that selects all address space not addressed by another chip select or occupied by internal address space. Therefore CS0 has no ADDRSEL register. All EBC registers are write protected by the EINIT protection mechanism. This means that after execution of the EINIT instruction by the C166S V2 CPU these registers are not writeable anymore. For a list of all EBC control registers refer to Chapter 9.4. All EBC registers are located in a 128 byte segment.
6.3.2
The EBC MODE Registers EBCMODx
EBC Mode Register 0 EBCMOD0
15 14 13
ALE DIS
XSFR
11 10 9
SLA VE
Reset value: 00F0H
6 5 4 3 2 1 0
12
BYT DIS
8
ARB EN
7
RDY RDY POL DIS
WR EBC CFG DIS
CSPEN
SAPEN
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
The EBC Mode Register 0 controls the alternate function of the pins.
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External Bus Controller Field RDYPOL Bits 15 Typ rw Description READY pin Polarity 0 1 RDYDIS 14 rw 0 1 ALEDIS 13 rw 0 1 BYTDIS 12 rw 0 1 WRCFG2) 11 rw 0 1 EBCDIS 10 rw 0 1 SLAVE 9 rw 0 1 ARBEN 8 rw READY is active low READY is active high READY enabled READY disabled1) ALE enabled ALE disabled1) BHE enabled BHE disabled1) WR and BHE WRL and WRH EBC is using the pins for external bus EBC pins disabled1) Bus arbiter acts in master mode Bus arbiter acts in slave mode
READY pin Disable
ALE pin Disable
BHE pin Disable
Configuration for pins WR/WRL, BHE/WRH
EBC pins Disable
SLAVE mode enable
BUS Arbitration Pins enable 0 HOLD, HLDA and BREQ disabled1) 1 pins act as HOLD, HLDA and BREQ
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External Bus Controller Field CSPEN Bits [7:4] Typ
rw
Description CS Pins Enable1) 0000 0001 ... 1000 else enables pins CS7, ..., CS0 reserved no chipselect pins enabled enables pin CS0
SAPEN
[3:0]
rw
Segment Addresses Pins Enable1) 0000 no segment address pin enabled 0001 enables address pin A[16] ... 1000 enables address pins A[23:16] else reserved
1) 2)
disabled pins are tristate and/or usable as General Purpose IO (GPIO) A change of the bit content is not valid before the next external bus access cycle.
The EBC Mode register 1 controls the general behaviour of the EBC. EBC Mode Register 1 EBCMOD1
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r
XSFR
8 0 r 7 0 r 6 DHP DIS rw 5 0 r 4
Reset value: 0000H
3 2 APDIS rw 1 0
Bits 0 [15:7] [5]
Typ r
Description
Reserved The software always reads a '0'. Although these bits are read only, the software should always write a '0' in case of a write access. Data High Pins Disable 0 AD Bus Pins[15:8] enabled 1 AD Bus Pins[15:8] disabled, can be used as GPIO Address Pins Disable 00000 Address Bus Pins [15:0] enabled 11111 Address Bus Pins [15:0] disabled, can be used as GPIO others reserved (do not use)
DHPDIS
[6]
rw
APDIS1)
[4:0]
rw
1)
For a demultiplexed external bus access with the address pins disabled no address will be available.
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6.3.3
The Timing Configuration registers TCONCSx
The timing control registers are used to program the described cycle timing for the different access phases. The timing control registers may be reprogrammed during code fetches from the affected address window. The new settings are first valid for the next access. Timing Configuration Register for Chip Select Channel 0 TCONCS0 XSFR
15 0 r 14 13 12 11 10 9 8 PHE rw 7 6 5 PHD rw 4 PHC rw
Reset value: 6243H
3 2 PHB rw 1 PHA rw 0
WRPHF rw
RDPHF rw
Timing Configuration Register for Chip Select Channel x TCONCSx XSFR
15 0 r 14 13 12 11 10 9 8 PHE rw 7 6 5 PHD rw 4
Reset value: 0000H
3 PHC rw 2 PHB rw 1 PHA rw 0
WRPHF rw
RDPHF rw
x = 1 ... 7 For controlling accesses to the monitor memory and start up memory there are two timing control registers TCONCSMM and TCONCSSM. The functional control selection and address windows are fixed and not changeable for the built-in memories. Timing Configuration Register for Chip Select Monitor Memory TCONCSMM XSFR Reset value: 6243H
15 0 r 14 13 12 11 10 9 8 PHE rw 7 6 5 PHD rw 4 PHC rw 3 2 PHB rw 1 PHA rw 0
WRPHF rw
RDPHF rw
Timing Configuration Register for Chip Select Startup Memory TCONCSSM XSFR Reset value: 6243H
15 0 r 14 13 12 11 10 9 8 PHE rw 7 6 5 PHD rw 4 PHC rw 3 2 PHB rw 1 PHA rw 0
WRPHF rw
RDPHF rw
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External Bus Controller Field 0 Bits 15 Typ r Description Reserved The software always reads a '0'. Although this bit is read only, the software should always write a '0' in case of a write access. Write Phase F 00 ... 11 RDPHF [12:11] rw 00 ... 11 PHE [10:6] rw 3 clock cycles 1 clock cycle 32 clock cycles Phase E 00000 ... 11111 PHD 5 rw Phase D 0 1 PHC [4:3] rw 00 ... 11 PHB 2 rw 0 1 PHA [1:0] rw 00 ... 11 3 clock cycles 3 clock cycles 1 clock cycle 2 clock cycles 0 clock cycles Phase B 0 clock cycles 1 clock cycle 0 clock cycles 3 clock cycles 0 clock cycles Read Phase F 0 clock cycles
WRPHF
[14:13] rw
Phase C
Phase A
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6.3.4
The Function Configuration Registers FCONCSx
The Function Control registers are used to control the bus and ready functionality for a selected address window. It can be distinguished between 8 and 16 bit bus and multiplexed and demulitplexed accesses. Furthermore the READY functionality can be programmed and defined whether the address window is enabled or not. Function Configuration Register for Chip Select Channel 0 FCONCS0 XSFR
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r 8 0 r 7 0 r 6 0 r 5 4
Reset value: 0021H
3 0 r 2 1 0
EN CS
BTYP
RDY RDY MOD EN
rw
rw
rw
rw
Function Configuration Register for Chip Select Channel x FCONCSx XSFR
15 0 r 14 0 r 13 0 r 12 0 r 11 0 r 10 0 r 9 0 r 8 0 r 7 0 r 6 0 r 5 4
Reset value: 0000H
3 0 r 2 1 0
EN CS
BTYP
RDY RDY MOD EN
rw
rw
rw
rw
x = 1 ... 7 Field 0 Bits [15:6] Typ r Description Reserved The software always reads a '0'. Although these bits are read only, the software should always write a '0' in case of a write access. Bus Type Selection 00 01 10 11 0 3 r 8 bit Demultiplexed 8 bit Multiplexed 16 bit Demultiplexed 16 bit Multiplexed
BTYP
[5:4]
rw
Reserved The software always reads a '0'. Although this bit is read only, the software should always write a '0' in case of a write access.
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External Bus Controller Field RDYMOD Bits 2 Typ rw Description Ready Mode 0 1 RDYEN 1 rw 0 1 ENCS1) 0 rw asynchronous READY synchronous READY access time is controlled by bitfield PHEx access time is controlled by bitfield PHEx and READY signal Enable Chip Select 0 1
1)
Ready enable
disable enable
Disabling a Chip Select not only effects the chip select output signal; it also deactivates the respective address window of the disabled chip select. A disabled address window is also ignored by an address window arbitration (see Chapter 6.3.5.2).
6.3.5
The Address Window Selection Registers ADDRSELx
Reset value: 0000H
4 3 2 1 0
Address range and size Select for Chip Select Channel x ADDRSELx XSFR
15 14 13 12 11 10 9 8 7 6 5
RGSAD rw
RGSZ rw
x = 1 ... 7 Field RGSAD RGSZ Bits [15:4] [3:0] Typ rw rw Description Address Range Start Address Selection Address Range Size Selection (see Table 6-2)
Note: There is no register ADDRSEL0, as register set FCONCS0 / TCONCS0 controls all external accesses outside the seven address windows built by the seven address selects ADDRSEL1 to ADDRSEL7.
6.3.5.1
Definition of Address Areas
The seven register sets FCONCS1/TCONCS1/ADDRSEL1 to FCONCS7/TCONCS7/ ADDRSEL7 define seven separate address areas within the address space of the C166S V2. Within each of these address areas external accesses can be driven in one
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External Bus Controller of the four different bus modes independently. Each ADDRSELx register cuts out an address window, where the corresponding parameters of the registers FCONCSx and TCONCSx are used to control external accesses. The range start address of such a window defines the most significant address bits of the selected window which are consequently not needed to address the memory/module in this window (Table 6-2). The size of the window chosen by ADDRSELx.RGSZ defines the relevant bits of ADDRSELx.RGSAD (marked with `R') which are used to select with the most significant bits of the request address the corresponding window. The other bits of the request address are used to address the memory locations inside this window. The lower bits of ADDRSELx.RGSAD (marked `x') are disregarded. Two additional chip select channels, which are used for accessing the startup and the monitor memory, are located in a predefined address range. The size of these two address areas is fixed to 32 kByte. The address area from 00'8000H to 00'FFFFH (32 kbyte) is reserved for C166S V2 CPU internal I/O, the area from BF'0000H to BF'FFFFH (64 kbyte) for startup and monitor memory and the area from C0'0000H to FF'FFFFH (4 Mbyte) is used by the internal program memory. Therefore, these address areas cannot be used by external resources connected to the external bus. Table 6-2 Address range and size for ADDRSELx ADDRSELx Range Size RGSZ
3..0 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 11xx
1)
Address Window Selected Range start address A[23:0] address range selected with R-bits of RGSAD
size 4 KBytes 8 KBytes 16 KBytes 32 KBytes 64 KBytes 128 KBytes 256 KBytes 512 KBytes 1 MBytes 2 MBytes 4 MBytes 8 MBytes reserved1) A23 RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRR0 RR00 R000 ---RRRR RRRR RRRR RRRR RRRR RRR0 RR00 R000 0000 0000 0000 0000 ---... RRRR RRR0 RR00 R000 0000 0000 0000 0000 0000 0000 0000 0000 ---0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 ---0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 ---A0 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 ----
Relevant (R) bits of RGSAD
15 RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRRR RRRx RRxx Rxxx xxxx ... RRRR RRRR RRRR RRRR RRRR RRRx RRxx Rxxx xxxx xxxx xxxx xxxx xxxx 4 RRRR RRRx RRxx Rxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
The complete address space of 12 MByte can be selected by the default chip select CS0.
Note: The range start address can only be on boundaries specified by the selected range size according to Table 6-2.
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6.3.5.2
Address Window Arbitration
For each external access the EBC compares the current address with all address select registers (programmable ADDRSELx and hardwired address select registers for startup and monitor memory) of enabled windows. This comparison is done in four levels. Priority 1: The hardwired address select registers for startup and monitor memories are evaluated first. A match with one of these two address ranges directs the access to the respective memory using the corresponding chip select with its timing control register. The window of monitor and start up is not accessible by other chip selects. Priority 2: Registers ADDRSELx [x = 2, 4, 6] are evaluated first. A window match with one of these registers directs the access to the respective external area using the corresponding set of control registers FCONCSx/TCONCSx and ignoring registers ADDRSELy. An overlapping of windows of this group will lead to an undefined behaviour. Priority 3: A match with registers ADDRSELy [y = 1, 3, 5, 7] directs the access to the respective external area using the corresponding set of control registers FCONCSy/TCONCSy. An overlapping of windows of this group will lead to an undefined behaviour. Overlaps with priority 2 ADDRSELx are only allowed for the (x,y) pairs (2,1), (4,3) and (6,5). Priority 4: If there is no match with any address select register (neither the hardwired ones nor the programmable ADDRSEL) the access to the external bus uses the general set of control registers FCONCS0/TCONCS0 if enabled.
Active Window Inactive Window
Not external addressable Window Window reserved for Startup and Monitor CS2 CS6 CS4
CSSM CSMM
1
2
Priority CS1 CS5 CS3 CS7
2
Priority
3
3
CS0
4
000000 H 008000 H 010000 H
H
4
C00000 H BF000 0
internal I/O startup and trace memory segment 191 internal program memory
Figure 6-5
Address Window Arbitration
Note: Only the indicated overlaps are allowed. All other overlaps lead to erroneous bus cycles. E.g. ADDSEL4 may not overlap ADDRSEL2 or ADDRSEL1. The
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External Bus Controller hardwired address ranges for the startup memory and the monitor memory are defined non-overlapping.
6.3.6 6.3.6.1
Ready Controlled Bus Cycles General
For situations, where the response (access) time of a peripheral is not constant, or where the programmable wait states are not enough, the C166S V2 EBC provides external bus cycles that are terminated via a READY input signal. In this case during phase E the C166S V2 EBC first counts a programmable number of clock cycles (1...32) and starts in the last wait cycle to monitor the internal READY line (see Figure 6-6) to determine the actual end of the current bus cycle. The external device drives READY active in order to indicate that data has been latched (write cycle) or is available (read cycle). The READY pin is generally enabled by setting the bit RDYDIS in EBCMOD0 to '0' in order to switch the corresponding port pin. Also the polarity of the READY is defined inside the EBCMOD0 register on the RDYPOL bit. For a specific access the READY function is enabled via the RDYEN bit in the FCONCSx registers. With FCONCSx.RDYMOD the READY is handled either in synchronous or in asynchronous mode (see also Figure 6-6). When the READY function is enabled for a specific address window, each bus cycle within this window must be terminated with an active READY signal. Otherwise the controller hangs until the next reset. This is also the case for an enabled RDYEN but a disabled READY port pin.
async. 0 READY ext 1 0
sync
READY int 1
EBCMOD0.RDYPOL
FCONCSx.RDYMODx
Figure 6-6
External to internal READY conversion
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6.3.6.2
The Synchronous/Asynchronous READY
The synchronous READY provides the fastest bus cycles, but requires setup and hold times to be met. The CLKOUT signal should be enabled and may be used by the peripheral logic to control the READY timing in this case. The asynchronous READY is less restrictive, but requires one additional wait state caused by the internal synchronization. As the asynchronous READY is sampled earlier programmed wait states may be necessary to provide proper bus cycles A READY signal (especially asynchronous READY) that has been activated by an external device may be deactivated in response to the trailing (rising) edge of the respective command (RD or WR).
Bus Cycle with active READY
programmed phase E wait states
Bus Cycle extended via READY
programmed phase E wait states
ALE
RD/WR
sync. READY
async. READY
sampling of READY input
not interesting READY cycles
Figure 6-7
Ready controlled bus cycles
6.3.6.3
Combining the READY function with predefined wait states
Typically an external wait state or READY control logic takes a while to generate the READY signal when a cycle was started. After a predefined number of clock cycles the C166S V2 will start checking its READY line to determine the end of the bus cycle. When using the READY function with so-called `normally-ready' peripherals, it may lead to erroneous bus cycles, if the READY line is sampled too early. These peripherals pull their READY output active, while they are idle. When they are accessed, they drive READY inactive until the bus cycle is complete, then drive it active again. If, however, the peripheral drives READY inactive a little late, after the first sample point of the C166S V2, the controller samples an active READY and terminates the current bus cycle too early. By inserting predefined wait states the first READY sample point can be shifted to a time, where the peripheral has safely controlled the READY line.
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6.3.7
EBC Idle State
When the external bus interface is enabled, but no external access is currently executed, the EBC is idle. As long as only internal resources (from a CPU point of view) like RAM, peripherals or registers, etc. are used, the external bus interface remains unchanged (see Table 6-3). The external control signals (RD and WR or WRL/WRH if enabled) remain inactive (high). Table 6-3 Pins AD15 to AD0 A15 to A0 A23 to A16 CS7 to CS0 BHE ALE RD WR/WRL WRH Status of the External Bus Interface during EBC Idle State Internal accesses only Tristate (floating) Undefined address (if used for the bus interface) Undefined segment address (on selected pins) Inactive (high) Level corresponding to last external access Inactive (low) Inactive (high) Inactive (high) Inactive (high)
6.4 6.4.1
Multi Master Systems External Bus Arbitration
The C166S V2 supports multi master systems on the external bus by its external bus arbitration. This bus arbitration allows an external master to request the C166S V2's bus. The C166S V2 will release the external bus and will float the data and address bus lines and force the control signals via pull ups/downs to their inactive state.
6.4.1.1
Initialization of Arbitration
During reset all arbitration pins are tristate, except pin BREQ which is pulled inactive. After reset the C166S V2 EBC always starts in `init mode' where the external bus is available but no arbitration is enabled. All arbitration pins are ignored in this state. Other to the external bus connected C166S V2 EBCs assume to have the bus also, so potential bus conflicts are not resolved. For a multimaster system the arbitration should be initialized first before starting any bus access. The EBC can either be chosen as arbitration master or as arbitration slave by programming the EBCMOD0 bit SLAVE. The selected mode and the arbitration gets active by the first setting of the HLDEN bit inside the CPUs PSW register. Afterwards a change of the slave/master mode is not possible
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External Bus Controller without resetting the device. Of course for arbitration the dedicated pins have to be activated by setting EBCMOD0.ARBEN.
6.4.1.2
Arbitration Master Scheme
If the C166S V2 EBC is configured as arbitration master, it is default owner of the external bus, controls the arbitration protocol and drives the bus also during idle phases with no bus requests. To perform the arbitration handshake a HOLD input allows the request of the external bus from the arbitration master. When the arbitration master hands over the bus to the requester this is signaled by driving the hold acknowledge pin HLDA low, which remains at this level until the arbitration slave frees the bus by releasing its request on the HOLD input. If the arbitration master is not the owner of the bus it treats the external bus interface as follows: * * * * Address and data bus(es) float to tristate Command lines are pulled high by internal pull-up devices (RD, WR/WRL, BHE/WRH) Address latch control line ALE is pulled low by an internal pull-down device CSx outputs are pulled high by internal pull-up devices.
In this state the arbitration slave can take over the bus. If the arbitration master requires the bus again, it can request the bus via the bus request signal BREQ. As soon as the arbitration master regains the bus it releases the BREQ signal and drives HLDA to high.
not fixed number of cycles (0 ... n)
HOLD
HLDA
earliest change
BREQ CSx,WRH WR/WRL, RD ADD, DATA BHE
pull up
not active driven
high impedance
Figure 6-8
Releasing the Bus by the Arbitration Master
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HOLD
HLDA
no BREQ request
BREQ
latest possible change
CSx,WRH WR/WRL, RD ADD, BHE
pull up
not active driven
high impedance
Note: The falling BREQ edge shows the last chance for BREQ to trigger the indicated regain-sequence. Even if BREQ is activated earlier the regain-sequence is initiated by HOLD going high. Please note that HOLD may also be deactivated without the C166S V2 requesting the bus.
6.4.1.3
Arbitration Slave Scheme
If the C166S V2 EBC is configured as arbitration slave it is by default not owner of the external bus and has to request the bus first. As long as it has not finished all its queued requests and the arbitration master is not requesting the bus the arbitration slave stays owner of the bus. For the description of the signal handling of the handshake see Chapter 6.4.1.2. For the arbitration slave the hold acknowledge pin HLDA is configured as input.
6.4.1.4
Locking the Bus
If an application in a multimaster system requires a sequence of undisturbed bus access it has the possibility (independently of being arbitration slave or master) to lock1) the bus
1)
It is not allowed to lock the bus by resetting the EBCMOD0.ARBEN bit, as this can lead to bus conflicts.
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External Bus Controller by setting the PSW bit HLDEN to `0'. In this case the looked C166S V2 EBC will not answer to HOLD requests from other external bus master until HLDEN is set to `1' again. Of course a looked bus master not owning the bus can request the external bus. If a master and a slave are requesting the external bus at the same time for several accesses, they toggle the ownership after each access cycle if the bus is not locked.
6.4.2
Connecting Multimaster Systems
Two C166S V2s where one is configured as arbitration master and the other as arbitration slave can be connected directly together as shown in Figure 6-10. As both EBCs assume after reset to own the external bus, the `slave' CPU has to be released from reset and initialized first, before starting the `master' CPU. The other way is to start both systems at the same time but then both EBC must be configured and the PSW.HLDEN bits set before the first external bus request.
HOLD
HOLD HLDA
C166S V2 in Master Mode
HLDA
BREQ
BREQ
Figure 6-10 Connecting two C166S V2s using Master/Slave Arbitration When more than two C166S V2s or other compatible bus masters are connected together additional interconnection/arbitration logic is required. In this case the slave/ master selection has to be done according to the introduced logic.
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6.5
Fastest possible external access
The following four figures show the principal possible fastest access type for the EBC. Figure 6-11 Fastest Read Cycle Demultiplexed Bus
b CLK ALE e
ADDR, CS
valid
RD
DATA in
valid
Figure 6-12
Fastest Write Cycle Demultiplexed Bus
b CLK ALE e
ADDR, CS
valid
WR
DATA out
valid
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Figure 6-13
Fastest Read Cycle Multiplexed Bus
b CLK ALE e f
ADDR, CS
valid
RD
muxed Address out / DATA in
add valid
d.valid
Figure 6-14
Fastest Write Cycle Multiplexed Bus
b CLK ALE e
ADDR, CS
valid
WR
muxed Address out / DATA out
addr valid valid
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Instruction Set
7
7.1
Instruction Set
Short Instruction Summary
The following compressed cross-reference tables quickly identify specific instructions and provide basic information about them Two ordering schemes are included: The first table (two pages) is a compressed cross-reference table that quickly associates specific hexadecimal opcodes with the corresponding mnemonics. The second table lists instructions by their mnemonic and identifies the addressing modes that may be used with the specific instructions and indicates the instruction length for the selected addressing mode. This reference helps to optimize instruction sequences in terms of code size and/or execution time.
Description Levels In the following sections the instructions are compiled according to different criteria in order to provide different levels of precision: * Cross Reference Tables summarize all instructions in condensed tables * The Instruction Set Summary groups the individual instructions into functional groups * The Opcode Table references the instructions by their hexadecimal opcode
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Instruction Set 0x x0 ADD x1 ADDB x2 ADD x3 ADDB x4 ADD x5 ADDB x6 ADD x7 ADDB x8 ADD x9 ADDB xA BFLDL xB MUL xC ROL xD JMPR xE BCLR xF BSET 1x ADDC ADDCB ADDC ADDCB ADDC ADDCB ADDC ADDCB ADDC ADDCB BFLDH MULU ROL JMPR BCLR BSET 2x SUB SUBB SUB SUBB SUB SUBB SUB SUBB SUB SUBB BCMP PRIOR ROR JMPR BCLR BSET 3x SUBC SUBCB SUBC SUBCB SUBC SUBCB SUBC SUBCB SUBC SUBCB ROR JMPR BCLR BSET 4x CMP CMPB CMP CMPB CMP CMPB CMP CMPB DIV SHL JMPR BCLR BSET 5x XOR XORB XOR XORB XOR XORB XOR XORB XOR XORB BOR DIVU SHL JMPR BCLR BSET 6x AND ANDB AND ANDB AND ANDB AND ANDB AND ANDB BAND DIVL SHR JMPR BCLR BSET 7x OR ORB OR ORB OR ORB OR ORB OR ORB BXOR DIVLU SHR JMPR BCLR BSET
BMOVN BMOV
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Instruction Set 8x x0 CMPI1 x1 NEG x2 CMPI1 x3 CoXXX x4 MOV 9x CMPI2 CPL CMPI2 CoXXX MOV Ax CMPD1 NEGB CMPD1 CoXXX MOVB DIS WDT CMPD1 Bx CMPD2 CPLB CMPD2 Co STORE MOVB EINIT CMPD2 SRST MOV MOVB JNBS CALLR ASHR JMPR BCLR BSET Cx MOVBZ MOVBZ Co STORE MOV MOVBZ SCXT MOV MOVB CALLA RET NOP JMPR BCLR BSET Dx AT/ EXTR CMOV MOV Ex MOVB Fx MOV MOVB MOV MOVB MOVB MOV MOVB JMPS RETI POP JMPR BCLR BSET
MOVBS MOV
MOVBS PCALL MOVB
x5 ENWDT x6 CMPI1 x7 IDLE x8 MOV x9 MOVB xA JB xB xC SBRK xD JMPR xE BCLR xF BSET CMPI2
MOVBS SCXT MOV
PWRDN SRV WDT MOV MOVB JNB TRAP JMPI JMPR BCLR BSET MOV MOVB JBC CALLI ASHR JMPR BCLR BSET
EXTP/S/ MOVB R MOV MOVB CALLS RETS MOV MOVB JMPA RETP
EXTP/S/ PUSH R JMPR BCLR BSET JMPR BCLR BSET
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Instruction Set
7.2
Instruction Set Summary
This section summarizes the instructions and lists them by functional class. This enables quick identification of the right instruction(s) for a specific function. The following notes apply to this summary: Data Addressing Modes Rw: Rb: IDX: QX: QR: reg: - - - - - - Word GPR (R0, R1, ... , R15) Byte GPR (RL0, RH0, ..., RL7, RH7) Address Pointer IDX (IDX0, IDX1) Address Offset Register QX (QX0, QX1) Address Offset Register QR (QR0, QR1) SFR or GPR (in case of a byte operation on an SFR, only the low byte can be accessed via `reg') Direct word or byte memory location Indirect word or byte memory location (Any word GPR can be used as indirect address pointer, except for the arithmetic, logical and compare instructions, where only R0 to R3 are allowed) Direct bit in the bit-addressable memory area Direct word in the bit-addressable memory area Immediate constant (The number of significant bits which can be specified by the user is represented by the respective appendix 'x') Immediate 8-bit mask used for bit-field modifications
mem: [...]:
- -
bitaddr: bitoff: #data:
- - -
#mask8: -
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Instruction Set Table 7-1 shows the various combinations of pointer post-modification for the addressing modes of the CoXXX instructions. The symbols "[Rwn*]" and "[IDXi]" will be used to refer to these addressing modes. Table 7-1 Symbol "[IDXi]" stands for Pointer Post-Modification Combinations for IDXi and Rwn Mnemonic [IDXi] [IDXi+] [IDXi -] [IDXi + QXj] [IDXi - QXj] "[Rwn]" stands for [Rwn] [Rwn+] [Rwn-] [Rwn+QRj] [Rwn - QRj] Address Pointer Operation (IDXi) (IDXi) (no-operation) (IDXi) (IDXi) +2 (i=0,1) (IDXi) (IDXi) -2 (i=0,1) (IDXi) (IDXi) + (QXj) (i, j =0,1) (IDXi) (IDXi) - (QXj) (i, j =0,1) (Rwn) (Rwn) (no-operation) (Rwn) (Rwn) +2 (n=0-15) (Rwn) (Rwn) -2 (n=0-15) (Rwn) (Rwn) + (QRj) (n=0-15;j =0,1) (Rwn) (Rwn) - (QRj) (n=0-15; j =0,1)
Multiply and Divide Operations The MDL and MDH registers are implicit source and/or destination operands of the multiply and divide instructions. Branch Target Addressing Modes caddr: seg: rel: #trap7: - - - - Direct 16-bit jump target address (Updates the Instruction Pointer) Direct 2-bit segment address (Updates the Code Segment Pointer) Signed 8-bit jump target word offset address relative to the Instruction Pointer of the following instruction Immediate 7-bit trap or interrupt number.
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Instruction Set Extension Operations The EXT* instructions override the standard DPP addressing scheme: #pag10: #seg8: - - Immediate 10-bit page address. Immediate 8-bit segment address.
Branch Condition Codes cc: Symbolically specifiable condition codes cc_UC cc_Z cc_NZ cc_V cc_NV cc_N cc_NN cc_C cc_NC cc_EQ cc_NE cc_ULT cc_ULE cc_UGE cc_UGT cc_SLE cc_SGE cc_SGT cc_NET cc_nusr0 cc_nusr1 cc_usr0 cc_usr1 -Unconditional -Zero -Not Zero -Overflow -No Overflow -Negative -Not Negative -Carry -No Carry -Equal -Not Equal -Unsigned Less Than -Unsigned Less Than or Equal -Unsigned Greater Than or Equal -Unsigned Greater Than -Signed Less Than or Equal -Signed Greater Than or Equal -Signed Greater Than -Not Equal and Not End-of-Table -USR-bit 0 is cleared1) -USR-bit 1 is cleared1) -USR-bit 0 is set1) -USR-bit 1 is set1)
1)
Only usable with the JMPA and CALLA instructions
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Instruction Set
Mnemonic ADD[B] ADDC[B] AND[B] OR[B] SUB[B] SUBC[B] XOR[B] ASHR ROL / ROR SHL / SHR BAND BCMP BMOV BMOVN BOR / BXOR BCLR BSET BFLDH BFLDL MOV[B]
Addressing ModesBytes Rwn Rwm Rwn [Rwi] Rwn [Rwi+] Rwn #data3 reg reg mem Rwn Rwn bitaddrZ.z #data16 mem reg Rwm #data4 bitaddrQ.q
1) 1) 1) 1)
2 2 2 2 4 4 4 2 2 4
Mnemonic CPL[B] NEG[B] DIV DIVL DIVLU DIVU MUL MULU CMPD1/2 CMPI1/2 CMP[B]
Addressing ModesBytes Rwn Rwn
1)
2 2
Rwn Rwn Rwn Rwn Rwn Rwn Rwn Rwn reg reg cc cc seg rel cc bitaddrQ.q
Rwm #data4 #data16 mem Rwm [Rwi] [Rwi+] #data3 #data16 mem caddr [Rwn] caddr
2 2 4 4 2 2 2 2 4 4 4 2 4 2 2 4
1) 1) 1) 1) 2)
bitaddrQ.q bitoffQ Rwn Rwn Rwn Rwn [Rwm] [-Rwm] [Rwn] [Rwn+] [Rwn] reg Rwn [Rwm+#d16] [Rwn] mem reg mem Rwn reg mem Rwm #seg -
2 #mask8 #data8 4 Rwm #data4 [Rwm] [Rwm+] Rwn Rwn [Rwm] [Rwm] [Rwm+] #data16 [Rwm+#d16] Rwn mem [Rwn] mem reg Rbm mem reg #irang2 #irang2
1) 1) 1) 1) 1) 1)
2 2 2 2 2 2 2 2 2 4 4 4 4 4 4 4 2 4 4 2 4 2
2) 1) 1)
CALLA JMPA CALLI JMPI CALLS JMPS CALLR JMPR JB JBC JNB JNBS PCALL POP PUSH RETP SCXT PRIOR TRAP ATOMIC EXTR EXTP EXTPR SRST/IDLE PWRDN SRVWDT DISWDT ENWDT EINIT
rel rel
reg reg reg reg Rwn #trap7 #irang2 Rwm #pag -
caddr
4 2 4 4 2 2 2
#data16 mem Rwm
MOVBS MOVBZ EXTS EXTSR NOP RET RETI RETS SBRK
1) 2)
#irang2 #irang2
2 4 4
Byte oriented instructions (suffix `B') use Rb instead of Rw (not with [Rwn]!). Byte oriented instructions (suffix `B') use #data8 instead of #data16.
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Instruction Set
Instruction Set Summary Mnemonic Arithmetic Operations ADD ADD ADD ADD ADD ADD ADD ADDB ADDB ADDB ADDB ADDB ADDB ADDB ADDC ADDC ADDC ADDC ADDC ADDC ADDC ADDCB ADDCB ADDCB ADDCB ADDCB ADDCB Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem mem, reg Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem Add direct word GPR to direct GPR Add indirect word memory to direct GPR Add indirect word memory to direct GPR and postincrement source pointer by 2 Add immediate word data to direct GPR Add immediate word data to direct register Add direct word memory to direct register Add direct word register to direct memory Add direct byte GPR to direct GPR Add indirect byte memory to direct GPR Add indirect byte memory to direct GPR and post-increment source pointer by 1 Add immediate byte data to direct GPR Add immediate byte data to direct register Add direct byte memory to direct register Add direct byte register to direct memory Add direct word GPR to direct GPR with Carry Add indirect word memory to direct GPR with Carry Add indirect word memory to direct GPR with Carry and post-increment source pointer by 2 Add immediate word data to direct GPR with Carry Add immediate word data to direct register with Carry Add direct word memory to direct register with Carry Add direct word register to direct memory with Carry Add direct byte GPR to direct GPR with Carry Add indirect byte memory to direct GPR with Carry Add indirect byte memory to direct GPR with Carry and post-increment source pointer by 1 Add immediate byte data to direct GPR with Carry Add immediate byte data to direct register with Carry Add direct byte memory to direct register with Carry 2 2 2 2 4 4 4 2 2 2 2 4 4 4 2 2 2 2 4 4 4 2 2 2 2 4 4 Description Bytes
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Instruction Set Summary (cont'd) Mnemonic Description Bytes
Arithmetic Operations (cont'd) ADDCB SUB SUB SUB SUB SUB SUB SUB SUBB SUBB SUBB SUBB SUBB SUBB SUBB SUBC SUBC SUBC SUBC SUBC SUBC SUBC SUBCB SUBCB SUBCB SUBCB SUBCB mem, reg Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem mem, reg Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 Add direct byte register to direct memory with Carry Subtract direct word GPR from direct GPR Subtract indirect word memory from direct GPR Subtract indirect word memory from direct GPR and post-increment source pointer by 2 Subtract immediate word data from direct GPR Subtract immediate word data from direct register Subtract direct word memory from direct register Subtract direct word register from direct memory Subtract direct byte GPR from direct GPR Subtract indirect byte memory from direct GPR Subtract indirect byte memory from direct GPR and post-increment source pointer by 1 Subtract immediate byte data from direct GPR Subtract immediate byte data from direct register Subtract direct byte memory from direct register Subtract direct byte register from direct memory Subtract direct word GPR from direct GPR with Carry Subtract indirect word memory from direct GPR with Carry Subtract indirect word memory from direct GPR with Carry and post-increment source pointer by 2 Subtract immediate word data from direct GPR with Carry Subtract immediate word data from direct register with Carry 4 2 2 2 2 4 4 4 2 2 2 2 4 4 4 2 2 2 2 4
Subtract direct word memory from direct register with Carry 4 Subtract direct word register from direct memory with Carry 4 Subtract direct byte GPR from direct GPR with Carry Subtract indirect byte memory from direct GPR with Carry Subtract indirect byte memory from direct GPR with Carry and post-increment source pointer by 1 Subtract immediate byte data from direct GPR with Carry 2 2 2 2
Subtract immediate byte data from direct register with Carry 4 7-183 V 1.7, 2001-01
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Instruction Set
Instruction Set Summary (cont'd) Mnemonic Description Bytes
Arithmetic Operations (cont'd) SUBCB SUBCB MUL MULU DIV DIVL DIVLU DIVU CPL CPLB NEG NEGB reg, mem mem, reg Rw, Rw Rw, Rw Rw Rw Rw Rw Rw Rb Rw Rb Subtract direct byte memory from direct register with Carry Subtract direct byte register from direct memory with Carry Signed multiply direct GPR by direct GPR (16-16-bit) Unsigned multiply direct GPR by direct GPR (16-16-bit) Signed divide register MDL by direct GPR (16-/16-bit) Signed long divide register MD by direct GPR (32-/16-bit) Unsigned long divide register MD by direct GPR (32-/16-bit) Unsigned divide register MDL by direct GPR (16-/16-bit) Complement direct word GPR Complement direct byte GPR Negate direct word GPR Negate direct byte GPR 4 4 2 2 2 2 2 2 2 2 2 2
Logical Instructions AND AND AND AND AND AND AND ANDB ANDB ANDB ANDB ANDB ANDB ANDB Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem mem, reg Bitwise AND direct word GPR with direct GPR Bitwise AND indirect word memory with direct GPR Bitwise AND indirect word memory with direct GPR and post-increment source pointer by 2 Bitwise AND immediate word data with direct GPR Bitwise AND immediate word data with direct register Bitwise AND direct word memory with direct register Bitwise AND direct word register with direct memory Bitwise AND direct byte GPR with direct GPR Bitwise AND indirect byte memory with direct GPR Bitwise AND indirect byte memory with direct GPR and post-increment source pointer by 1 Bitwise AND immediate byte data with direct GPR Bitwise AND immediate byte data with direct register Bitwise AND direct byte memory with direct register Bitwise AND direct byte register with direct memory 2 2 2 2 4 4 4 2 2 2 2 4 4 4
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Instruction Set Summary (cont'd) Mnemonic Logical Instructions (cont'd) OR OR OR OR OR OR OR ORB ORB ORB ORB ORB ORB ORB XOR XOR XOR XOR XOR XOR XOR XORB XORB XORB XORB XORB XORB XORB Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem mem, reg Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem mem, reg Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem mem, reg Bitwise OR direct word GPR with direct GPR Bitwise OR indirect word memory with direct GPR Bitwise OR indirect word memory with direct GPR and post-increment source pointer by 2 Bitwise OR immediate word data with direct GPR Bitwise OR immediate word data with direct register Bitwise OR direct word memory with direct register Bitwise OR direct word register with direct memory Bitwise OR direct byte GPR with direct GPR Bitwise OR indirect byte memory with direct GPR Bitwise OR indirect byte memory with direct GPR and post-increment source pointer by 1 Bitwise OR immediate byte data with direct GPR Bitwise OR immediate byte data with direct register Bitwise OR direct byte memory with direct register Bitwise OR direct byte register with direct memory Bitwise XOR direct word GPR with direct GPR Bitwise XOR indirect word memory with direct GPR Bitwise XOR indirect word memory with direct GPR and post-increment source pointer by 2 Bitwise XOR immediate word data with direct GPR Bitwise XOR immediate word data with direct register Bitwise XOR direct word memory with direct register Bitwise XOR direct word register with direct memory Bitwise XOR direct byte GPR with direct GPR Bitwise XOR indirect byte memory with direct GPR Bitwise XOR indirect byte memory with direct GPR and post-increment source pointer by 1 Bitwise XOR immediate byte data with direct GPR Bitwise XOR immediate byte data with direct register Bitwise XOR direct byte memory with direct register Bitwise XOR direct byte register with direct memory 7-185 2 2 2 2 4 4 4 2 2 2 2 4 4 4 2 2 2 2 4 4 4 2 2 2 2 4 4 4 V 1.7, 2001-01 Description Bytes
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Instruction Set
Instruction Set Summary (cont'd) Mnemonic Description Bytes
Boolean Bit Manipulation Operations BCLR BSET BMOV BMOVN BAND BOR BXOR BCMP BFLDH BFLDL CMP CMP CMP CMP CMP CMP CMPB CMPB CMPB CMPB CMPB CMPB bitaddr bitaddr bitaddr, bitaddr bitaddr, bitaddr bitaddr, bitaddr bitaddr, bitaddr bitaddr, bitaddr bitaddr, bitaddr bitoff, #mask8, #data8 bitoff, #mask8, #data8 Rw, Rw Rw, [Rw] Rw, [Rw +] Rw, #data3 reg, #data16 reg, mem Rb, Rb Rb, [Rw] Rb, [Rw +] Rb, #data3 reg, #data8 reg, mem Clear direct bit Set direct bit Move direct bit to direct bit Move negated direct bit to direct bit AND direct bit with direct bit OR direct bit with direct bit XOR direct bit with direct bit Compare direct bit to direct bit Bitwise modify masked high byte of bit-addressable direct word memory with immediate data Bitwise modify masked low byte of bit-addressable direct word memory with immediate data Compare direct word GPR to direct GPR Compare indirect word memory to direct GPR Compare indirect word memory to direct GPR and post-increment source pointer by 2 Compare immediate word data to direct GPR Compare immediate word data to direct register Compare direct word memory to direct register Compare direct byte GPR to direct GPR Compare indirect byte memory to direct GPR Compare indirect byte memory to direct GPR and post-increment source pointer by 1 Compare immediate byte data to direct GPR Compare immediate byte data to direct register Compare direct byte memory to direct register 2 2 4 4 4 4 4 4 4 4 2 2 2 2 4 4 2 2 2 2 4 4
Compare and Loop Control Instructions CMPD1 CMPD1 Rw, #data4 Rw, #data16 Compare immediate word data to direct GPR and decrement GPR by 1 Compare immediate word data to direct GPR and decrement GPR by 1 7-186 2 4
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Instruction Set Summary (cont'd) Mnemonic Description Bytes
Compare and Loop Control Instructions (cont'd) CMPD1 CMPD2 CMPD2 CMPD2 CMPI1 CMPI1 CMPI1 CMPI2 CMPI2 CMPI2 Rw, mem Rw, #data4 Rw, #data16 Rw, mem Rw, #data4 Rw, #data16 Rw, mem Rw, #data4 Rw, #data16 Rw, mem Compare direct word memory to direct GPR and decrement GPR by 1 Compare immediate word data to direct GPR and decrement GPR by 2 Compare immediate word data to direct GPR and decrement GPR by 2 Compare direct word memory to direct GPR and decrement GPR by 2 Compare immediate word data to direct GPR and increment GPR by 1 Compare immediate word data to direct GPR and increment GPR by 1 Compare direct word memory to direct GPR and increment GPR by 1 Compare immediate word data to direct GPR and increment GPR by 2 Compare immediate word data to direct GPR and increment GPR by 2 Compare direct word memory to direct GPR and increment GPR by 2 4 2 4 4 2 4 4 2 4 4
Prioritize Instruction PRIOR Rw, Rw Determine number of shift cycles to normalize direct word GPR and store result in direct word GPR 2
Shift and Rotate Instructions SHL SHL SHR Rw, Rw Rw, #data4 Rw, Rw Shift left direct word GPR; number of shift cycles specified by direct GPR Shift left direct word GPR; number of shift cycles specified by immediate data Shift right direct word GPR; number of shift cycles specified by direct GPR 2 2 2
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Instruction Set Summary (cont'd) Mnemonic Description Bytes
Shift and Rotate Instructions (cont'd) SHR ROL ROL ROR ROR ASHR ASHR Rw, #data4 Rw, Rw Rw, #data4 Rw, Rw Rw, #data4 Rw, Rw Rw, #data4 Shift right direct word GPR; number of shift cycles specified by immediate data Rotate left direct word GPR; number of shift cycles specified by direct GPR Rotate left direct word GPR; number of shift cycles specified by immediate data Rotate right direct word GPR; number of shift cycles specified by direct GPR Rotate right direct word GPR; number of shift cycles specified by immediate data Arithmetic (sign bit) shift right direct word GPR; number of shift cycles specified by direct GPR Arithmetic (sign bit) shift right direct word GPR; number of shift cycles specified by immediate data 2 2 2 2 2 2 2
Data Movement MOV MOV MOV MOV MOV MOV MOV MOV MOV MOV MOV MOV Rw, Rw Rw, #data4 reg, #data16 Rw, [Rw] Rw, [Rw +] [Rw], Rw [-Rw], Rw [Rw], [Rw] [Rw +], [Rw] [Rw], [Rw +] Rw, [Rw + #data16] [Rw + #data16], Rw Move direct word GPR to direct GPR Move immediate word data to direct GPR Move immediate word data to direct register Move indirect word memory to direct GPR Move indirect word memory to direct GPR and post-increment source pointer by 2 Move direct word GPR to indirect memory Pre-decrement destination pointer by 2 and move direct word GPR to indirect memory Move indirect word memory to indirect memory Move indirect word memory to indirect memory and post-increment destination pointer by 2 Move indirect word memory to indirect memory and post-increment source pointer by 2 Move indirect word memory by base plus constant to direct GPR Move direct word GPR to indirect memory by base plus constant 7-188 2 2 4 2 2 2 2 2 2 2 4 4
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Instruction Set Summary (cont'd) Mnemonic Data Movement (cont'd) MOV MOV MOV MOV MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVBS MOVBS MOVBS [Rw], mem mem, [Rw] reg, mem mem, reg Rb, Rb Rb, #data4 reg, #data8 Rb, [Rw] Rb, [Rw +] [Rw], Rb [-Rw], Rb [Rw], [Rw] [Rw +], [Rw] [Rw], [Rw +] Rb, [Rw + #data16] [Rw + #data16], Rb [Rw], mem mem, [Rw] reg, mem mem, reg Rw, Rb reg, mem mem, reg Move direct word memory to indirect memory Move indirect word memory to direct memory Move direct word memory to direct register Move direct word register to direct memory Move direct byte GPR to direct GPR Move immediate byte data to direct GPR Move immediate byte data to direct register Move indirect byte memory to direct GPR Move indirect byte memory to direct GPR and post-increment source pointer by 1 Move direct byte GPR to indirect memory Pre-decrement destination pointer by 1 and move direct byte GPR to indirect memory Move indirect byte memory to indirect memory Move indirect byte memory to indirect memory and post-increment destination pointer by 1 Move indirect byte memory to indirect memory and post-increment source pointer by 1 Move indirect byte memory by base plus constant to direct GPR Move direct byte GPR to indirect memory by base plus constant Move direct byte memory to indirect memory Move indirect byte memory to direct memory Move direct byte memory to direct register Move direct byte register to direct memory Move direct byte GPR with sign extension to direct word GPR Move direct byte memory with sign extension to direct word register Move direct byte register with sign extension to direct word memory 4 4 4 4 2 2 4 2 2 2 2 2 2 2 4 4 4 4 4 4 2 4 4 Description Bytes
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Instruction Set Summary (cont'd) Mnemonic Data Movement (cont'd) MOVBZ MOVBZ MOVBZ Rw, Rb reg, mem mem, reg Move direct byte GPR with zero extension to direct word GPR Move direct byte memory with zero extension to direct word register Move direct byte register with zero extension to direct word memory 2 4 4 Description Bytes
Jump and Call Operations JMPA JMPI JMPR JMPS JB JBC JNB JNBS CALLA CALLI CALLR CALLS PCALL TRAP cc, caddr cc, [Rw] cc, rel seg, caddr bitaddr, rel bitaddr, rel bitaddr, rel bitaddr, rel cc, caddr cc, [Rw] rel seg, caddr reg, caddr #trap7 Jump absolute if condition is met Jump indirect if condition is met Jump relative if condition is met Jump absolute to a code segment Jump relative if direct bit is set Jump relative and clear bit if direct bit is set Jump relative if direct bit is not set Jump relative and set bit if direct bit is not set Call absolute subroutine if condition is met Call indirect subroutine if condition is met Call relative subroutine Call absolute subroutine in any code segment Push direct word register onto system stack and call absolute subroutine Call interrupt service routine via immediate trap number 4 2 2 4 4 4 4 4 4 2 2 4 4 2
System Stack Operations POP PUSH SCXT SCXT reg reg reg, #data16 reg, mem Pop direct word register from system stack Push direct word register onto system stack Push direct word register onto system stack und update register with immediate data Push direct word register onto system stack und update register with direct memory 2 2 4 4
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Instruction Set Summary (cont'd) Mnemonic Return Operations RET RETS RETP RETI System Control SRST SBRK IDLE PWRDN SRVWDT DISWDT ENWDT EINIT ATOMIC EXTR EXTP EXTP EXTPR EXTPR EXTS EXTS EXTSR EXTSR #irang2 #irang2 Rw, #irang2 #pag10, #irang2 Rw, #irang2 #pag10, #irang2 Rw, #irang2 #seg8, #irang2 Rw, #irang2 #seg8, #irang2 Software Reset Software Break Enter Idle Mode Enter Power Down Mode (supposes NMI-pin being low) Service Watchdog Timer Disable Watchdog Timer Enable Watchdog Timer Signify End-of-Initialization on RSTOUT-pin Begin ATOMIC sequence Begin EXTended Register sequence Begin EXTended Page sequence Begin EXTended Page sequence Begin EXTended Page and Register sequence Begin EXTended Page and Register sequence Begin EXTended Segment sequence Begin EXTended Segment sequence Begin EXTended Segment and Register sequence Begin EXTended Segment and Register sequence
*) *) *) *) *) *) *) *) *) *)
Description
Bytes
Return from intra-segment subroutine Return from inter-segment subroutine reg Return from intra-segment subroutine and pop direct word register from system stack Return from interrupt service subroutine
2 2 2 2
4 2 4 4 4 4 4 4 2 2 2 4 2 4 2 4 2 4
Miscellaneous NOP Null operation 2
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Instruction Set
7.3
Instruction Opcodes
This section lists the C166S V2 CPU instructions by hexadecimal opcodes to help identify specific instructions when reading executable code, ie. during the debugging phase. Notes for Opcode Lists * These instructions are encoded by means of additional bits in the operand field of the instruction x0H - x7H: Rw, #data3 or Rb, #data3 Rw, [Rw] or Rb, [Rw] x8H - xBH: xCH - xFH: Rw, [Rw +] or Rb, [Rw +] For these instructions, only the lowest four GPRs (R0 to R3) can be used as indirect address pointers. * These instructions are encoded by means of additional bits in the operand field of the instruction 00xx.xxxxB: EXTS or ATOMIC 01xx.xxxxB: EXTP 10xx.xxxxB: EXTSR or EXTR EXTPR 11xx.xxxxB: Notes on the JMPR Instructions The condition code to be tested for the JMPR instructions is specified by the opcode. Two mnemonic representation alternatives exist for some of the condition codes. Notes on the JMPA and CALLA Instructions For JMPA+/- and CALLA+/- instructions, a static user programmable prediction scheme is used. If bit 8 ('a') of the instruction long word is cleared, then the branch is assumed `taken'. If it is set, then the branch is assumed `not taken'. The user controls bit 8 value by entering '+' or '-' in the instruction mnemonics. This bit can be also set/cleared by the Assembler for JMPA and CALLA instructions depending on the jump condition. For JMPA instruction, a pre-fetch hint bit is used (the instruction bit 9 'l'). This bit is required by the fetch unit to deal efficiently with short backward loops. It must be set if 0 < IP_jmpa - IP_target <= 32, where IP_jmpa is the address of the JMPA instruction and IP_target is the target address of the JMPA. Otherwise, bit 9 must be cleared. Notes on the BCLR and BSET Instructions The position of the bit to be set or cleared is specified by the opcode. The operand `bitoff.n' (n = 0 to 15) refers to a particular bit within a bit-addressable word.
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Instruction Set Notes on CoXXX instructions All CoXXX instructions have a 3-bit wide extended control field 'rrr' in the operand field to control the MRW repeat counter. It is located within the CoXXX instructions at bit positions [31:29]. - - - - - `000' `001' `010' `011' '1xx' -> -> -> -> -> regular CoXXX instruction. RESERVED `- USR0 CoXXX' instruction. `- USR1 CoXXX' instruction. RESERVED.
Notes on CoXXX instructions using indirect addressing modes These CoXXX instructions have extended control fields in the operand field to specify the special indirect addressing mode. Bitfield 'X' is 4-bits wide and is located within CoXXX instructions at bit positions [15:12]. Bit [15] specifies one of the two IDX address pointers; the bitfield [14:12] specifies the operation concerning the IDX pointer. Bit[15]: - `0' - `1' - - - - - - - - `000' `001' `010' `011' '100' '101' '110' '111' -> IDX0 -> IDX1 -> -> -> -> -> -> -> -> RESERVED no-operation IDX +2 IDX -2 IDX + QX0 IDX - QX0 IDX + QX1 IDX - QX1
Bitfield[14:12]
Bitfield 'qqq' is 3-bits wide and is located within CoXXX instructions at bit positions [26:24]. It specifies the operation concerning the Rw pointer. Bitfield[26:24] - - - - - - - - `000' `001' `010' `011' '100' '101' '110' '111' -> -> -> -> -> -> -> -> RESERVED no-operation Rw +2 Rw -2 Rw + QR0 Rw - QR0 Rw + QR1 Rw - QR1
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Instruction Set Notes on the Undefined Opcodes A hardware trap occurs when one of the undefined opcodes signified by `----' is decoded by the CPU. In the following table used symbols for instruction cycle times: reg bit co 0-1 2-3 5-6 4+15 1-31 1 cycle, if short register addressing uses GPR 2 cycles, else 1 cycle if at least one bit address is a GPR 2 cycles, else 1 to 2 cycle (see table for MAC instructions) 0 cycles, if branch is executed zerocycle 1 cycle, else 2 cycles, if CPUCON1.SGTDIS = 1 3 cycles, else 5 cycles, if CPUCON1.SGTDIS = 1 6 cycles, else 4 visible cycles to calculate PSW for division, plus 15 invisible cycle where the result is not available 1 to 31 cycles for 'multicycle' NOP (opcode CC 000d:dddd)
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Instruction Set
Hexcode 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F Bytes/ Mnemonic Cycles 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/1 2/1 2/1 2/0-1 2/1 2/1 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/1 2/1 2/1 2/0-1 2/1 2/1 ADD ADDB ADD ADDB ADD ADDB ADD ADDB ADD ADDB BFLDL MUL ROL JMPR BCLR BSET ADDC ADDCB ADDC ADDCB ADDC ADDCB ADDC ADDCB ADDC ADDCB BFLDH MULU ROL JMPR BCLR BSET Operands Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitoff, #mask8, #data8 Rw, Rw Rw, Rw cc_UC, rel bitoff.0 bitoff.0 Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitoff, #mask8, #data8 Rw, Rw Rw, #data4 cc_NET, rel bitoff.1 bitoff.1 Hexcode 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F Bytes/ Mnemonic Cycles 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/bit 2/1 2/1 2/0-1 2/1 2/1 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/bit -/2/1 2/0-1 2/1 2/1 SUB SUBB SUB SUBB SUB SUBB SUB SUBB SUB SUBB BCMP PRIOR ROR JMPR BCLR BSET SUBC SUBCB SUBC SUBCB SUBC SUBCB SUBC SUBCB SUBC SUBCB BMOVN ROR JMPR BCLR BSET Operands Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw, Rw Rw, Rw cc_EQ, rel or cc_Z, rel bitoff.2 bitoff.2 Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw, #data4 cc_NE, rel or cc_NZ, rel bitoff.3 bitoff.3
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Hexcode 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F Bytes/ Cycles 2/1 2/1 4/reg 4/reg -/-/4/1 4/1 2/1 2/1 4/bit 2/4+15 2/1 2/0-1 2/1 2/1 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/bit 2/4+15 2/1 2/0-1 2/1 2/1 Mnemonic CMP CMPB CMP CMPB CMP CMPB CMP CMPB BMOV DIV SHL JMPR BCLR BSET XOR XORB XOR XORB XOR XORB XOR XORB XOR XORB BOR DIVU SHL JMPR BCLR BSET Operands Rw, Rw Rb, Rb reg, mem reg, mem reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw Rw, Rw cc_V, rel bitoff.4 bitoff.4 Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw Rw, #data4 cc_NV, rel bitoff.5 bitoff.5 Hexcode 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F Bytes/ Cycles 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/bit 2/4+15 2/1 2/0-1 2/1 2/1 2/1 2/1 4/reg 4/reg 4/reg 4/reg 4/1 4/1 2/1 2/1 4/bit 2/4+15 2/1 2/0-1 2/1 2/1 Mnemonic AND ANDB AND ANDB AND ANDB AND ANDB AND ANDB BAND DIVL SHR JMPR BCLR BSET OR ORB OR ORB OR ORB OR ORB OR ORB BXOR DIVLU SHR JMPR BCLR BSET Operands Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw Rw, Rw cc_N, rel bitoff.6 bitoff.6 Rw, Rw Rb, Rb reg, mem reg, mem mem, reg mem, reg reg, #data16 reg, #data8 Rw, [Rw +] or Rw, [Rw] or Rw, #data3 1) Rb, [Rw +] or Rb, [Rw] or Rb, #data3 bitaddr, bitaddr Rw Rw, #data4 cc_NN, rel bitoff.7 bitoff.7
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Instruction Set
Hexcode 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F Bytes/ Cycles 2/1 2/1 4/1 4/co 4/2 4/1 4/1 4/5 2/1 2/1 4/1 -/2/1 2/0-1 2/1 2/1 2/1 2/1 4/1 4/co 4/2 -/4/1 4/5 2/1 2/1 4/1 2/2-3 2/1 2/0-1 2/1 2/1 Mnemonic CMPI1 NEG CMPI1 CoXXX MOV ENWDT CMPI1 IDLE MOV MOVB JB SBRK JMPR BCLR BSET CMPI2 CPL CMPI2 CoXXX MOV CMPI2 PWRDN MOV MOVB JNB TRAP JMPI JMPR BCLR BSET Operands Rw, #data4 Rw Rw, mem xx [Rw], mem Hexcode A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF Bytes/ Cycles 2/1 2/1 4/1 4/co 4/2 4/1 4/1 4/1 2/1 2/1 4/1 2/2 2/1 2/0-1 2/1 2/1 2/1 2/1 4/1 4/1 4/2 4/1 4/1 4/5 2/1 2/1 4/1 2/1 2/1 2/0-1 2/1 2/1 Mnemonic CMPD1 NEGB CMPD1 CoXXX MOVB DISWDT CMPD1 SRVWDT MOV MOVB JBC CALLI ASHR JMPR BCLR BSET CMPD2 CPLB CMPD2 CoSTORE MOVB EINIT CMPD2 SRST MOV MOVB JNBS CALLR ASHR JMPR BCLR BSET Operands Rw, #data4 Rb Rw, mem xx [Rw], mem
Rw, #data16 [-Rw], Rw [-Rw], Rb bitaddr, rel cc_C, rel or cc_ULT, rel bitoff.8 bitoff.8 Rw, #data4 Rw Rw, mem xxx mem, [Rw] Rw, #data16
Rw, #data16 Rw, [Rw] Rb, [Rw] bitaddr, rel cc, [Rw] Rw, Rw cc_SGT, rel bitoff.10 bitoff.10 Rw, #data4 Rb Rw, mem [Rw*], CoREG mem, [Rw]
Rw, #data16
Rw, [Rw+] Rb, [Rw+] bitaddr, rel #trap7 cc, [Rw] cc_NC, rel or cc_UGE, rel bitoff.9 bitoff.9
[Rw], Rw [Rw], Rb bitaddr, rel rel Rw, #data4 cc_SLE, rel bitoff.11 bitoff.11
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Instruction Set
Hexcode C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF Bytes/ Cycles 2/1 -/1 4/1 4/1 4/1 4/1 4/2 -/2/2 2/2 4/1 2/1 2/1-31 2/0-1 2/1 2/1 2/1 2/1 4/1 4/2 4/1 4/1 4/2 4/1 2/2 2/2 4/2 2/2 2/1 2/0-1 2/1 2/1 Mnemonic MOVBZ MOVBZ CoSTORE MOV MOVBZ SCXT MOV MOVB CALLA RET NOP JMPR BCLR BSET MOVBS ATOMIC or EXTR MOVBS CoMOV MOV MOVBS SCXT EXTP(R), EXTS(R) MOV MOVB CALLS RETS EXTP(R), EXTS(R) JMPR BCLR BSET Operands Rw, Rb reg, mem Rw, CoREG [Rw+#data16], Rw mem, reg reg, #data16 [Rw], [Rw] [Rw], [Rw] cc, addr Hexcode E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF Bytes/ Cycles 2/1 2/1 4/2 -/4/1 -/4/1 4/1 2/2 2/2 4/0-1 2/2 2/1 2/0-1 2/1 2/1 2/1 2/1 4/1 4/1 4/1 -/4/1 4/1 -/-/4/0-1 2/5-6 2/1 2/0-1 2/1 2/1 Mnemonic MOV MOVB PCALL MOVB MOV MOVB MOV MOVB JMPA RETP PUSH JMPR BCLR BSET MOV MOVB MOV MOVB MOVB MOV MOVB JMPS RETI POP JMPR BCLR BSET Operands Rw, #data4 Rb, #data4 reg, caddr [Rw+#data16], Rb reg, #data16 reg, #data8 [Rw], [Rw+] [Rw], [Rw+] cc, caddr reg reg cc_UGT, rel bitoff.14 bitoff.14 Rw, Rw Rb, Rb reg, mem reg, mem Rb, [Rw + #data16] mem, reg mem, reg seg, caddr
cc_SLT, rel bitoff.12 bitoff.12 Rw, Rb #irang2 reg, mem [IDX*], [Rw*] Rw, [Rw + #data16] mem, reg reg, mem #pag10,#irang2 #seg8, #irang2 [Rw+], [Rw] [Rw+], [Rw] seg, caddr
Rw, #irang2 cc_SGE, rel bitoff.13 bitoff.13
reg cc_ULE, rel bitoff.15 bitoff.15
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Instruction Set Hex-code Extended Hex-code 83 00 83 01 83 02 83 08 83 0A 83 10 83 11 83 12 83 20 83 22 83 2A 83 30 83 31 83 3A 83 40 83 41 83 42 83 48 83 4A 83 50 83 51 83 52 83 60 83 62 83 6A 83 70 83 71 83 7A 83 80 83 81 83 88 83 8A 83 90 83 91 83 9A 83 A0 83 AA 83 B0 83 B1 83 BA 83 C0 83 C1 83 C2 83 C8
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Cycles 1 2 1 1 1 1 2 1 1 1 1 1 2 1 1 2 1 1 1 1 2 1 1 1 1 1 2 1 1 2 1 1 1 2 1 1 1 1 2 1 1 2 1 1
Mnemonic CoMULu CoMULu CoADD CoMULuCoSUB CoMACu CoMACu CoSUBR CoMACuCoLOAD CoLOADCoMACRu CoMACRu CoMAX CoMULsu CoMULsu CoADD2 CoMULsuCoSUB2 CoMACsu CoMACsu CoSUB2R CoMACsuCoLOAD2 CoLOAD2CoMACRsu CoMACRsu CoMIN CoMULus CoMULus CoMULusCoSHL CoMACus CoMACus CoSHR CoMACusCoASHR CoMACRus CoMACRus CoASHR CoMUL CoMUL CoCMP CoMUL7-199
Operands RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] [RWm*] RWn, [RWm*] RWn, [RWm*], rnd [RWm*] RWn, [RWm*] [RWm*] RWn, [RWm*] RWn, [RWm*], rnd [RWm*] , rnd RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*]
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Instruction Set Hex-code Extended Hex-code 83 CA 83 D0 83 D1 83 E0 83 F0 83 F1 93 00 93 01 93 02 93 08 93 0A 93 10 93 11 93 12 93 18 93 19 93 20 93 22 93 28 93 2A 93 30 93 31 93 38 93 39 93 3A 93 40 93 41 93 42 93 48 93 4A 93 50 93 51 93 52 93 58 93 59 93 5A 93 5A 93 5A 93 60 93 62 93 68 93 6A 93 70 93 71 93 78
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Cycles 1 1 2 1 1 2 1 2 1 1 1 1 2 1 1 2 1 1 1 1 1 2 1 2 1 1 2 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 2 1
Mnemonic CoABS CoMAC CoMAC CoMACCoMACR CoMACR CoMULu CoMULu CoADD CoMULuCoSUB CoMACu CoMACu CoSUBR CoMACMu CoMACMu CoMACuCoLOAD CoMACMuCoLOADCoMACRu CoMACRu CoMACMRu CoMACMRu CoMAX CoMULsu CoMULsu CoADD2 CoMULsuCoSUB2 CoMACsu CoMACsu CoSUB2R CoMACMsu CoMACMsu CoNOP CoNOP CoNOP CoMACsuCoLOAD2 CoMACMsuCoLOAD2CoMACRsu CoMACRsu CoMACMRsu
7-200
Operands RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd RWn, [RWm*] RWn, [RWm*] RWn, [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*] [IDXi*], [RWm*] [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*]
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Instruction Set Hex-code Extended Hex-code 93 79 93 7A 93 80 93 81 93 88 93 90 93 91 93 98 93 99 93 A0 93 A8 93 B0 93 B1 93 B8 93 B9 93 C0 93 C1 93 C2 93 C8 93 CA 93 D0 93 D1 93 D8 93 D9 93 E0 93 E8 93 F0 93 F1 93 F8 93 F9 A3 00 A3 01 A3 02 A3 08 A3 0A A3 10 A3 11 A3 12 A3 1A A3 20 A3 22 A3 2A A3 30 A3 31 A3 32
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Cycles 2 1 1 2 1 1 2 1 2 1 1 1 2 1 2 1 2 1 1 1 1 2 1 2 1 1 1 2 1 2 1 2 1 1 1 1 2 1 1 1 1 1 1 2 1
Mnemonic CoMACMRsu CoMIN CoMULus CoMULus CoMULusCoMACus CoMACus CoMACMus CoMACMus CoMACusCoMACMusCoMACRus CoMACRus CoMACMRus CoMACMRus CoMUL CoMUL CoCMP CoMULCoABS CoMAC CoMAC CoMACM CoMACM CoMACCoMACMCoMACR CoMACR CoMACMR CoMACMR CoMULu CoMULu CoADD CoMULuCoSUB CoMACu CoMACu CoSUBR CoABS CoMACuCoLOAD CoLOADCoMACRu CoMACRu CoNEG
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Operands [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] , rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*] [IDXi*], [RWm*], rnd [IDXi*], [RWm*] [IDXi*], [RWm*] , rnd RWn, RWm RWn, RWm, rnd RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm, rnd RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm , rnd
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Instruction Set Hex-code Extended Hex-code A3 3A A3 40 A3 41 A3 42 A3 48 A3 4A A3 50 A3 51 A3 52 A3 60 A3 62 A3 6A A3 70 A3 71 A3 72 A3 7A A3 80 A3 81 A3 82 A3 88 A3 8A A3 90 A3 91 A3 92 A3 9A A3 A0 A3 A2 A3 AA A3 B0 A3 B1 A3 B2 A3 B2 A3 BA A3 C0 A3 C1 A3 C2 A3 C8 A3 CA A3 D0 A3 D1 A3 E0 A3 F0 Cycles 1 1 2 1 1 1 1 2 1 1 1 1 1 2 1 1 1 2 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 2 1 1 Mnemonic CoMAX CoMULsu CoMULsu CoADD2 CoMULsuCoSUB2 CoMACsu CoMACsu CoSUB2R CoMACsuCoLOAD2 CoLOAD2CoMACRsu CoMACRsu CoNEG CoMIN CoMULus CoMULus CoSHL CoMULusCoSHL CoMACus CoMACus CoSHR CoSHR CoMACusCoASHR CoASHR CoMACRus CoMACRus CoASHR CoRND CoASHR CoMUL CoMUL CoCMP CoMULCoABS CoMAC CoMAC CoMACCoMACR Operands RWn, RWm RWn, RWm RWn, RWm , rnd RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm , rnd RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm , rnd rnd RWn, RWm RWn, RWm RWn, RWm, rnd #data5 RWn, RWm RWn RWn, RWm RWn, RWm, rnd #data5 RWn RWn, RWm #data5 RWn RWn, RWm RWn, RWm, rnd #data5, rnd RWn, rnd RWn, RWm RWn, RWm, rnd RWn, RWm RWn, RWm RWn, RWm RWn, RWm RWn, RWm, rnd RWn, RWm RWn, RWm
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Instruction Set Hex-code Extended Hex-code A3 F1 B3 C3 D3 00 Cycles 2 1 1 2 Mnemonic CoMACR CoSTORE CoSTORE CoMOV Operands RWn, RWm, rnd [RWn*], CoReg RWn, CoReg [IDXi*], [RWm*]
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Instruction Set
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Detailed Instruction Description
8
Detailed Instruction Description
This section describes each instruction in detail. The instructions are listed alphabetically, and the description contains the following elements. * Instruction Name: Specifies the mnemonic opcode of the instruction in oversized bold lettering for easy reference. The mnemonics have been chosen with regard to the particular operation performed by the instruction. * Syntax: Specifies the mnemonic opcode and the required formal operands of the instruction as used in the following subsection 'Operation'. There are instructions with either none, one, two or three operands, which must be separated from each other by commas: MNEMONIC {op1 {,op2 {,op3 } } } The syntax for the actual operands of an instruction depends on the selected addressing mode. All of the available addressing modes are summarized at the end of each single instruction description. In contrast to the syntax for the instructions described in the following material, the assembler provides much more flexibility in writing C166S V2 CPU programs (e.g. by generic instructions and by automatically selecting appropriate addressing modes whenever possible). Thus, it eases the use of the instruction set. * Operation: This part presents a logical description of the operation performed by an instruction as a symbolic formula or a high level language construct. The following symbols are used to represent data movement, arithmetic, or logical operators. Diadic operations: (opX) + * / Y Y mod || (opY) (opX) (opY) (opX) (opX) (opX) (opX) (opX) (opX) (opX) (opX) is is is is is is is is is is is operator (opY) MOVED into (opX) ADDED to (opY) SUBTRACTED from (opX) MULTIPLIED by (opY) DIVIDED by (opY) logically ANDed with (opY) logically ORed with (opY) logically EXCLUSIVELY ORed with (opY) COMPARED against (opY) divided MODULO (opY) CONCATENATED (opY) operator (opX)
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Monadic operations:
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Detailed Instruction Description y (opX) opX (opX) (opX[n]) ((opX)) is logically COMPLEMENTED
Parentheses indicate a method of addressing the used operand as follows: Specifies the immediate constant value of opX Specifies the contents of opX Specifies the contents of bit n of opX Specifies the contents of the contents of opX (ie. opX is used as pointer to the actual operand) Context Pointer Code Segment Pointer Instruction Pointer Multiply/Divide register (32 bits wide, consists of MDH and MDL) Multiply/Divide Low and High registers (each 16 bit wide) Accumulator (40 bits wide, consists of MAE, MAH and MDL) Accumulator Low and High registers (each 16 bits wide) Accumulator extension register (one byte wide) Program Status Word System Stack Pointer CPU Configuration register Carry condition flag in the PSW register Overflow condition flag in the PSW register Segmentation Disable bit in the SYSCON register Temporary variable for an intermediate storage of the number of shift or rotate cycles which remain to complete the shift or rotate operation Temporary variable for an intermediate result Constant values due to the data format of the specified operation
The following operands notation will also be used in the operational description: CP CSP IP MD MDL, MDH ACC MAH, MAL MAE PSW SP CPUCON1 C V SGTDIS count
tmp 0, 1, 2,...
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Detailed Instruction Description Data Types: This part specifies the particular data type according to the instruction. Basically, the following data types are possible: BIT, BYTE, WORD, DOUBLEWORD, ACC = 40-bit signed value Only CoXXX instructions and instructions which extend byte data to word data can change the data type. Note that the data types mentioned in this subsection do not cover accesses to indirect address pointers or to the system stack. These accesses are always performed with word data. Moreover, no data type is specified for System Control Instructions and for those branch instructions which do not access any explicitly addressed data. * Description: This part provides a brief description of the action that is executed by the respective instruction. * Condition Code: The Condition code indicates that the respective instruction is executed if the specified condition exists, and is skipped if it does not. The table below summarizes the sixteen possible condition codes that can be used within Call and Branch instructions. The table shows the abbreviations, the test that is executed for a specific condition, and a 4/5-bit number associated with condition code.
Condition Code Mnemonic cc cc_UC cc_Z cc_NZ cc_V cc_NV cc_N cc_NN cc_C cc_NC cc_EQ cc_NE cc_ULT cc_ULE cc_UGE cc_UGT
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Test
Description
Condition Code Number c 0H 2H 3H 4H 5H 6H 7H 8H 9H 2H 3H 8H FH EH
Condition Code Number d 0H 4H 6H 8H AH CH EH 10H 12H 4H 6H 10H 1EH 12H 1CH
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Unconditional Zero Not zero Overflow No overflow Negative Not negative Carry No carry Equal Not equal Unsigned less than Unsigned less than or equal Unsigned greater than
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Detailed Instruction Description Condition Code Mnemonic cc cc_SLT cc_SLE cc_SGE cc_SGT cc_NET cc_nusr0
1)
Test
Description
Condition Code Number c CH BH DH AH
Condition Code Number d 18H 16H 1AH 14H 02H 1H 3H 5H 7H
(NV) = 1 (NV) = 0 (ZE) = 0 usr0 = 0 usr1 = 0 usr0 = 1 usr1 = 1
Signed less than Signed greater than or equal
(Z(NV)) = 1 Signed less than or equal (Z(NV)) = 0 Signed greater than usr0 is cleared usr1 is cleared usr0 is set usr1 is set
Not equal AND not end of table 1H
cc_nusr11) cc_usr01) cc_usr11)
1)
Only usable with the JMA and CALLA instructions.
* Condition Flags: This part reflects the state of the N, C, V, Z, and E flags in the PSW register which is the state after execution of the corresponding instruction, except if the PSW register itself was specified as the destination operand of that instruction (see Note). The resulting state of the flags is represented by symbols as follows: '*' The flag is set due to the following standard rules for the corresponding flag: N=1: N=0: C=1: C=0: V=1: V=0: Z=1: Z=0: E=1: E=0: MSB of the result is set MSB of the result is not set Carry occurred during operation No Carry occurred during operation Arithmetic Overflow occurred during operation No Arithmetic Overflow occurred during operation Result equals zero Result does not equal zero Source operand represents the lowest negative number (either 8000h for word data or 80h for byte data) Source operand does not represent the lowest negative number for the specified data type
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Detailed Instruction Description 'S' The flag is set due to rules which deviate from the described standard. For more details see instruction pages (below) or the ALU status flags description. The flag is not affected by the operation. The flag is cleared by the operation. The flag contains the logical NORing of the two specified bit operands. The flag contains the logical ANDing of the two specified bit operands. The flag contains the logical ORing of the two specified bit operands. The flag contains the logical XORing of the two specified bit operands. The flag contains the original value of the specified bit operand. The flag contains the complemented value of the specified bit operand.
'-' '0' 'NOR' 'AND' 'OR' 'XOR' 'B' 'B'
Note: If the PSW register was specified as the destination operand of an instruction, the condition flags can not be interpreted as just described, because the PSW register is modified depending on the data format of the instruction as follows: For word operations, the PSW register is overwritten with the word result. For byte operations, the non-addressed byte is cleared and the addressed byte is overwritten. For bit or bit-field operations on the PSW register, only the specified bits are modified. Supposed that the condition flags were not selected as destination bits, they stay unchanged. This means that they keep the state after execution of the previous instruction. In any case, if the PSW was the destination operand of an instruction, the PSW flags do NOT represent the condition flags of this instruction as usual. * Addressing Modes: This part specifies which combinations of different addressing modes are available for the required operands. The selected addressing mode combination is usually specified by the opcode of the corresponding instruction. However, there are some arithmetic and logical instructions for which the addressing mode combination is not specified by the (identical) opcodes but by particular bits within the operand field. The addressing mode entries are made up of three elements: Mnemonic Shows accepted operands for the respective instruction. Format This part specifies the format of the instructions as it is represented in the assembler listing. Figure 8-1 shows the relation between the instruction format representation of the assembler and the corresponding internal organization of such an instruction format (N = nibble = 4 bits). The following symbols are used to describe the instruction formats: 00H through FFH: Instruction Opcodes
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Detailed Instruction Description 0, 1 :.... :..ii SS :..## :.### ...#:# c d n m q qqq z # t:ttt0 QQ rr rrr RR : Constant Values : Each of the 4 characters immediately following a colon represents a single bit : 2-bit short GPR address (Rwi) : Code segment number : 2-bit immediate constant (#irang2) : 3-bit immediate constant (#data3) : 5-bit immediate constant (#data5) : 4-bit condition code specification (cc) : 5-bit condition code specification (xcc) : 4-bit short GPR address (Rwn or Rbn) : 4-bit short GPR address (Rwm or Rbm) : 4-bit position of the source bit within the word specified by QQ : 3-bit addressing mode specifier for CoXXX instructions : 4-bit position of the destination bit within the word specified by ZZ : 4-bit immediate constant (#data4) : 7-bit trap number (#trap7) : 8-bit word address of the source bit (bitoff) : 8-bit relative target address word offset (rel) : 3-bit repeat control for CoXXX instructions : 8-bit word address reg
wwww:w : 5-bit word address CoREG X ZZ ## ## xx @@ : 4-bit addressing mode specifier for CoXXX instructions : 8-bit word address of the destination bit (bitoff) : 8-bit immediate constant (#data8) : 8-bit immediate constant (represented by #data16, byte xx is not significant) : 8-bit immediate constant (#mask8)
MM MM : 16-bit address (mem or caddr; low byte, high byte) ## ## a l : 16-bit immediate constant (#data16; low byte, high byte) : 1-bit branch assumption bit : 1-bit short backward loop bit
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Detailed Instruction Description Number of Bytes All C166S V2 CPU instructions are either 2 or 4 bytes. According to the instruction size, all instructions can be classified as either single word or double word instructions. N2N1 N4N3 N6N5 N8N7 High Byte 2nd word Low Byte 2nd word High Byte 1st word Low Byte 1st word
Representation in the Assembler Listing:
Internal Organization:
MSB N8 N7 N6
Bits in ascending order LSB N5 N4 N3 N2 N1
Figure 8-1
Instruction Format Representation
The following pages contain a detailed description of each normal arithmetic, logic, branch or system instruction in alphabetical order followed by a list of the dedicated DSP instructions:
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Detailed Instruction Description
8.1
Normal Instruction Set Integer Addition Arithmetic Instructions ADD op1, op2
op1, op2 WORD op1 WORD
ADD
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) + (op2)
ADD
Description Performs a 2s complement binary addition of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic ADD ADD ADD ADD ADD ADD ADD
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Z *
V *
C *
N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a carry is generated from the most significant bit of the word data type. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
Format 08 n:0### 00 nm 08 n:11ii 08 n:10ii 04 RR MM MM 06 RR ## ## 02 RR MM MM
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ADDB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) + (op2)
Integer Addition Arithmetic Instructions ADDB op1, op2
op1, op2 BYTE op1 BYTE
ADDB
Description Performs a 2s complement binary addition of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic ADDB ADDB ADDB ADDB ADDB ADDB ADDB Format 09 n:0### 01 nm 09 n:11ii 09 n:10ii 05 RR MM MM 07 RR ## xx 03 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V * C * N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the byte data type. Cleared otherwise. Set if a carry is generated from the most significant bit of the byte data type. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
ADDC
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Integer Addition with Carry Arithmetic Instructions ADDC op1, op2
op1, op2 WORD op1 WORD
ADDC
(op1) (op1) + (op2) + (C) Description Performs a 2s complement binary addition of the source operand specified by op2, the destination operand specified by op1 and the previously generated carry bit. The sum is then stored in op1. This instruction can be used to perform multiple precision arithmetic. CPU Flags E * E Z V C N Encoding Mnemonic ADDC ADDC ADDC ADDC ADDC ADDC ADDC Format 18 n:0### 10 nm 18 n:11ii 18 n:10ii 14 RR MM MM 16 RR ## ## 12 RR MM MM Bytes 2 2 2 2 4 4 4 Z S V * C * N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero and previous Z flag was set. Cleared otherwise. Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a carry is generated from the most significant bit of the word data type. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
ADDCB
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Integer Addition with Carry Arithmetic Instructions ADDCB op1, op2
op1, op2 BYTE op1 BYTE
ADDCB
(op1) (op1) + (op2) + (C) Description Performs a 2s complement binary addition of the source operand specified by op2, the destination operand specified by op1 and the previously generated carry bit. The sum is then stored in op1. This instruction can be used to perform multiple precision arithmetic. CPU Flags E * E Z V C N Encoding Mnemonic ADDCB ADDCB ADDCB ADDCB ADDCB ADDCB ADDCB Format 19 n:0### 11 nm 19 n:11ii 19 n:10ii 15 RR MM MM 17 RR ## xx 13 RR MM MM Bytes 2 2 2 2 4 4 4 Z S V * C * N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero and previous Z flag was set. Cleared otherwise. Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the byte data type. Cleared otherwise. Set if a carry is generated from the most significant bit of the byte data type. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
AND
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Logical AND Logical Instructions AND op1, op2
op1, op2 WORD op1 WORD
AND
Description Performs a bitwise logical AND of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic AND AND AND AND AND AND AND Format 68 n:0### 60 nm 68 n:11ii 68 n:10ii 64 RR MM MM 66 RR ## ## 62 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
ANDB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Logical AND Logical Instructions ANDB op1, op2
op1, op2 BYTE op1 BYTE
ANDB
Description Performs a bitwise logical AND of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic ANDB ANDB ANDB ANDB ANDB ANDB ANDB Format 69 n:0### 61 nm 69 n:11ii 69 n:10ii 65 RR MM MM 67 RR ## xx 63 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
ASHR
Group Syntax
Source Operand(s)
Arithmetic Shift Right Shift and Rotate Instructions ASHR op1, op2
op1 WORD op2 shift counter op1 WORD
ASHR
Destination Operand(s) Operation
(count) (op2) (V) 0 (C) 0 DO WHILE ((count) 0) (V) (C) (V) (C) (op1[0]) (op1[n]) (op1[n+1]) [n=0...14] (count) (count) - 1 END WHILE Description Arithmetically shifts the destination word operand op1 right by the number of times as specified by the source operand op2. To preserve the sign of the original operand op1, the most significant bits of the result are filled with zeros if the original most significant bit was a 0 or with ones if the original most significant bit was a 1. The Overflow flag is used as a Rounding flag. The least significant bit is shifted into the Carry. Only shift values between 0 and 15 are allowed. When using a GPR as the count control, only the least significant 4 bits are used. CPU Flags E 0 E Z V C N Z * V * C * N *
Always cleared. Set if result equals zero. Cleared otherwise. Set if in any cycle of the shift operation a 1 is shifted out of the carry flag. Cleared in case of a shift count equal 0. The carry flag is set according to the last least significant bit shifted out of op1. Cleared for a shift count of zero. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic ASHR ASHR Format BC #n AC nm Bytes 2 2
Rwn , #data4 Rwn , Rwm
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Detailed Instruction Description
ATOMIC
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Begin ATOMIC Sequence System Control Instructions ATOMIC op1
op1 2-bit instruction counter none
ATOMIC
(count) (op1) [1 op1 4] Disable interrupts and Class A traps DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 Enable interrupts and traps Description Causes standard and PEC interrupts and class A hardware traps to be disabled for a specified number of instructions. The ATOMIC instruction becomes immediately active. No NOPs are required for normal ATOMIC execution. Depending on the value of op1, the period of validity of the ATOMIC sequence extends over the sequence of the next one to four instructions being executed after the ATOMIC instruction. All instructions requiring multiple cycles or hold states to be executed are regarded as one instruction in this sense. Any instruction type can be used with the ATOMIC instruction. CPU Flags E E Z V C N Encoding Mnemonic ATOMIC
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Z -
V -
C -
N -
Not affected. Not affected. Not affected. Not affected. Not affected.
#irang2
Format D1 :00##-0
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Detailed Instruction Description
BAND
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Bit Logical AND Boolean Bit Manipulation Instructions BAND op1, op2
op1, op2 BIT op1 BIT
BAND
Description Performs a single bit logical AND of the source bit specified by op2 and the destination bit specified by op1. The result is then stored in op1. CPU Flags E 0 E Z V C N Encoding Mnemonic BAND Format 6A QQ ZZ qz Bytes 4 Z NOR V OR C AND N XOR
Always cleared. Contains the logical NOR of the two specified bits. Contains the logical OR of the two specified bits. Contains the logical AND of the two specified bits. Contains the logical XOR of the two specified bits.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
BCLR
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) 0
Bit Clear Boolean Bit Manipulation Instructions BCLR op1
none op1 BIT
BCLR
Description Clears the bit specified by op1. This instruction is primarily used for peripheral and system control. CPU Flags E 0 E Z V C N Encoding Mnemonic BCLR Format qE QQ Bytes 2 Z B V 0 C 0 N B
Always cleared. Contains the logical negation of the previous state of the specified bit. Always cleared. Always cleared. Contains the previous state of the specified bit.
bitaddrQ.q
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Detailed Instruction Description
BCMP
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Bit to Bit Compare Boolean Bit Manipulation Instructions BCMP op1, op2
op1, op2 BIT none
BCMP
Description Performs a single bit comparison of the source bit specified by op1 and the source bit specified by op2. No result is written by this instruction. Only the flags are updated. CPU Flags E 0 E Z V C N Encoding Mnemonic BCMP Format 2A QQ ZZ qz Bytes 4 Z NOR V OR C AND N XOR
Always cleared. Contains the logical NOR of the two specified bits. Contains the logical OR of the two specified bits. Contains the logical AND of the two specified bits. Contains the logical XOR of the two specified bits.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
BFLDH
Group Syntax
Source Operand(s)
Bit Field High Byte Boolean Bit Manipulation Instructions BFLDH op1, op2, op3
op1 WORD op2, op3 BYTE op1 WORD
BFLDH
Destination Operand(s) Operation
(count) 0 DO WHILE ((count) <8) IF (op2[(count)] = 1) (op1[(count) + 8]) op3[(count)] ENDIF (count) (count) + 1 END WHILE Description Replaces those bits in the high byte of the destination word operand op1 which are selected by an '1' in the mask specified by op2 with the bits at the corresponding positions in "op3". CPU Flags E 0 E Z V C N Encoding Mnemonic BFLDH Format bitoffQ , #mask8 , #data8 1A QQ ## @@ Bytes 4 Z * V 0 C 0 N *
Always cleared. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description
BFLDL
Group Syntax
Source Operand(s)
Bit Field Low Byte Boolean Bit Manipulation Instructions BFLDL op1, op2, op3
op1 WORD op2, op3 BYTE op1 WORD
BFLDL
Destination Operand(s) Operation
(count) 0 DO WHILE ((count) <8) IF op2[(count)] = 1 (op1[(count)]) op3[(count)] ENDIF (count) (count) + 1 END WHILE Description Replaces those bits in the low byte of the destination word operand op1 which are selected by an '1' in the mask specified by op2 with the bits at the corresponding positions in "op3". CPU Flags E 0 E Z V C N Encoding Mnemonic BFLDL Format 0A QQ @@ ## Bytes 4 Z * V 0 C 0 N *
Always cleared. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
bitoffQ , #mask8 , #data8
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Detailed Instruction Description
BMOV
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Bit to Bit Move Boolean Bit Manipulation Instructions BMOV op1, op2
op2 BIT op1 BIT
BMOV
Description Moves a single bit from the source operand specified by op2 into the destination operand specified by op1. The source bit is examined and the flags are updated accordingly. CPU Flags E 0 E Z V C N Encoding Mnemonic BMOV Format 4A QQ ZZ qz Bytes 4 Z B V 0 C 0 N B
Always cleared. Contains the logical negation of the source bit. Always cleared. Always cleared. Contains the state of the source bit.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
BMOVN
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Bit to Bit Move and Negate Boolean Bit Manipulation Instructions BMOVN op1, op2
op2 BIT op1 BIT
BMOVN
Description Moves the complement of a single bit from the source operand specified by op2 into the destination operand specified by op1. The source bit is examined and the flags are updated accordingly. CPU Flags E 0 E Z V C N Encoding Mnemonic BMOVN Format 3A QQ ZZ qz Bytes 4 Z B V 0 C 0 N B
Always cleared. Contains the logical negation of the source bit. Always cleared. Always cleared. Contains the state of the source bit.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
BOR
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Bit Logical OR Boolean Bit Manipulation Instructions BOR op1, op2
op1, op2 BIT op1 BIT
BOR
Description Performs a single bit logical OR of the source bit specified by op2 and the destination bit specified by op1. The result is then stored in op1. CPU Flags E 0 E Z V C N Encoding Mnemonic BOR Format 5A QQ ZZ qz Bytes 4 Z NOR V OR C AND N XOR
Always cleared. Contains the logical NOR of the two specified bits. Contains the logical OR of the two specified bits. Contains the logical AND of the two specified bits. Contains the logical XOR of the two specified bits.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
BSET
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) 1 Description Sets the bit specified by op1. CPU Flags E 0 E Z V C N Encoding Mnemonic BSET Z B
Bit Set Boolean Bit Manipulation Instructions BSET op1
none op1 BIT
BSET
V 0
C 0
N B
Always cleared. Contains the logical negation of the previous state of the specified bit. Always cleared. Always cleared. Contains the previous state of the specified bit.
bitaddrQ.q
Format qF QQ
Bytes 2
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Detailed Instruction Description
BXOR
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Bit Logical XOR Boolean Bit Manipulation Instructions BXOR op1, op2
op1, op2 BIT op1 BIT
BXOR
Description Performs a single bit logical EXCLUSIVE OR of the source bit specified by op2 and the destination bit specified by op1. The result is then stored in op1. CPU Flags E 0 E Z V C N Encoding Mnemonic BXOR Format 7A QQ ZZ qz Bytes 4 Z NOR V OR C AND N XOR
Always cleared. Contains the logical NOR of the two specified bits. Contains the logical OR of the two specified bits. Contains the logical AND of the two specified bits. Contains the logical XOR of the two specified bits.
bitaddrZ.z , bitaddrQ.q
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Detailed Instruction Description
CALLA
Group Syntax
Call Subroutine Absolute Call Instructions CALLA op1, op2
CALLA
Alternative Syntax CALLA+ op1, op2 CALLA- op1, op2
Source Operand(s) op1 extended condition code op2 16-bit address offset none
Destination Operand(s) Operation
IF (op1) THEN (SP) (SP) - 2 ((SP)) (IP) (IP) op2 ELSE next instruction END IF Description If the condition specified by op1 is met, a branch to the absolute memory location specified by the second operand op2 is taken. The value of the instruction pointer IP is placed into the system stack. Because the IP always points to the instruction following the branch instruction, the value stored in the system stack represents the return address of the calling routine. A static prediction scheme is used: if the bit 'a' of the instruction long word is cleared then CALLA is assumed 'taken' and if this bit is set to 1, CALLA is assumed 'not taken'. CALLA+ and CALLA- instructions are converted into CALLA assumed 'taken' (prediction bit cleared) and 'not taken' (prediction bit set) respectively. For regular CALLA instructions, the assembler assumes them 'taken'. CPU Flags E E Z V C
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Z -
V -
C -
N -
Not affected. Not affected. Not affected. Not affected.
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Detailed Instruction Description N Encoding Mnemonic CALLA Format CA d00a MM MM Bytes 4 Not affected.
xcc , caddr
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Detailed Instruction Description
CALLI
Group Syntax
Source Operand(s)
Call Subroutine Indirect Call Instructions CALLI op1, op2
op1 condition code op2 16-bit address offset none
CALLI
Destination Operand(s) Operation
IF (op1) THEN (SP) (SP) - 2 ((SP)) (IP) (IP) op2 ELSE next instruction END IF Description If the condition specified by op1 is met, a branch to the location specified indirectly by the second operand op2 is taken. The value of the instruction pointer IP is placed onto the system stack. Because the IP always points to the instruction following the branch instruction, the value stored in the system stack represents the return address of the calling routine. If the condition is not met, no action is taken and the next instruction is executed normally. CPU Flags E E Z V C N Encoding Mnemonic CALLI Format AB cn Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
cc , [Rwn]
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Detailed Instruction Description
CALLR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Call Subroutine Relative Call Instructions CALLR op1
op1 8-bit signed displacement none
CALLR
(SP) (SP) - 2 ((SP)) (IP) (IP) (IP) + 2*sign_extend(op1) Description A branch is taken to the location specified by the instruction pointer IP plus the relative displacement op1. The displacement is a two's complement number which is sign extended and counts the relative distance in words. The value of the instruction pointer (IP) is placed into the system stack. Because the IP always points to the instruction following the branch instruction, the value stored in the system stack represents the return address of the calling routine. The value of the IP used in the target address calculation is the address of the instruction following the CALLR instruction. CPU Flags E E Z V C N Encoding Mnemonic CALLR Format BB rr Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
rel
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Detailed Instruction Description
CALLS
Group Syntax
Source Operand(s)
Call Inter-Segment Subroutine Call Instructions CALLS op1, op2
op1 segment number op2 16-bit address offset none
CALLS
Destination Operand(s) Operation
(SP) (SP) - 2 ((SP)) (CSP) (SP) (SP) - 2 ((SP)) (IP) IF (CPUCON1.SGTDIS = 0) THEN (CSP) op1 END IF (IP) op2 Description A branch is taken to the absolute location specified by op2 within the segment specified by op1. The previous value of the CSP is placed into the system stack to ensure correct return to the calling segment. The value of the instruction pointer (IP) is also placed into the system stack. Because the IP always points to the instruction following the branch instruction, the value stored on the system stack represents the return address to the calling routine. CPU Flags E E Z V C N Encoding Mnemonic CALLS
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Z -
V -
C -
N -
Not affected. Not affected. Not affected. Not affected. Not affected.
seg , caddr
Format DA SS MM MM
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Detailed Instruction Description
CMP
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Integer Compare Boolean Bit Manipulation Instructions CMP op1, op2
op1, op2 WORD none
CMP
Description The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. The flags are set according to the rules of subtraction. The operands remain unchanged. CPU Flags E * E Z V C N Encoding Mnemonic CMP CMP CMP CMP CMP CMP Format 48 n:0### 40 nm 48 n:11ii 48 n:10ii 46 RR ## ## 42 RR MM MM Bytes 2 2 2 2 4 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] reg , #data16 reg , mem
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Detailed Instruction Description
CMPB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Integer Compare Boolean Bit Manipulation Instructions CMPB op1, op2
op1, op2 BYTE none
CMPB
Description The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. The flags are set according to the rules of subtraction. The operands remain unchanged. CPU Flags E * E Z V C N Encoding Mnemonic CMPB CMPB CMPB CMPB CMPB CMPB Format 49 n:0### 41 nm 49 n:11ii 49 n:10ii 47 RR ## xx 43 RR MM MM Bytes 2 2 2 2 4 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the byte data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] reg , #data8 reg , mem
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Detailed Instruction Description
CMPD1
Group Syntax
Source Operand(s)
Integer Compare and Decrement by 1 Compare and Loop Control Instructions CMPD1 op1, op2
op1, op2 WORD op1 WORD
CMPD1
Destination Operand(s) Operation
(op1) (op2) (op1) (op1) - 1 Description This instruction is used to enhance the performance and flexibility of loops. The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. Operand op1 may specify ONLY GPR registers. Once the subtraction has completed, the operand op1 is decremented by one. Using the set flags, a branch instruction can then be used in conjunction with this instruction to form common high level language FOR loops of any range. CPU Flags E * E Z V C N Encoding Mnemonic CMPD1 CMPD1 CMPD1 Format A6 Fn ## ## A0 #n A2 Fn MM MM Bytes 4 2 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data16 Rwn , #data4 Rwn , mem
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Detailed Instruction Description
CMPD2
Group Syntax
Source Operand(s)
Integer Compare and Decrement by 2 Compare and Loop Control Instructions CMPD2 op1, op2
op1, op2 WORD op1 WORD
CMPD2
Destination Operand(s) Operation
(op1) (op2) (op1) (op1) - 2 Description This instruction is used to enhance the performance and flexibility of loops. The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. Operand op1 may specify ONLY GPR registers. Once the subtraction has completed, the operand op1 is decremented by two. Using the set flags, a branch instruction can then be used in conjunction with this instruction to form common high level language FOR loops of any range. CPU Flags E * E Z V C N Encoding Mnemonic CMPD2 CMPD2 CMPD2 Format B6 Fn ## ## B0 #n B2 Fn MM MM Bytes 4 2 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data16 Rwn , #data4 Rwn , mem
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Detailed Instruction Description
CMPI1
Group Syntax
Source Operand(s)
Integer Compare and Increment by 1 Compare and Loop Control Instructions CMPI1 op1, op2
op1, op2 WORD op1 WORD
CMPI1
Destination Operand(s) Operation
(op1) (op2) (op1) (op1) + 1 Description This instruction is used to enhance the performance and flexibility of loops. The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. Operand op1 may specify ONLY GPR registers. Once the subtraction has completed, the operand op1 is incremented by one. Using the set flags, a branch instruction can then be used in conjunction with this instruction to form common high level language FOR loops of any range. CPU Flags E * E Z V C N Encoding Mnemonic CMPI1 CMPI1 CMPI1 Format 86 Fn ## ## 80 #n 82 Fn MM MM Bytes 4 2 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data16 Rwn , #data4 Rwn , mem
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Detailed Instruction Description
CMPI2
Group Syntax
Source Operand(s)
Integer Compare and Increment by 2 Compare and Loop Control Instructions CMPI2 op1, op2
op1, op2 WORD op1 WORD
CMPI2
Destination Operand(s) Operation
(op1) (op2) (op1) (op1) + 2 Description This instruction is used to enhance the performance and flexibility of loops. The source operand specified by op1 is compared to the source operand specified by op2 by performing a 2s complement binary subtraction of op2 from op1. Operand op1 may specify ONLY GPR registers. Once the subtraction has completed, the operand op1 is incremented by two. Using the set flags, a branch instruction can then be used in conjunction with this instruction to form common high level language FOR loops of any range. CPU Flags E * E Z V C N Encoding Mnemonic CMPI2 CMPI2 CMPI2 Format 96 Fn ## ## 90 #n 92 Fn MM MM Bytes 4 2 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data16 Rwn , #data4 Rwn , mem
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Detailed Instruction Description
CPL
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1)
Integer One's Complement Arithmetic Instructions CPL op1
op1 WORD op1 WORD
CPL
Description Performs a 1s complement of the source operand specified by op1. The result is stored back into op1. CPU Flags E * E Z V C N Encoding Mnemonic CPL Format 91 n0 Bytes 2 Z * V 0 C 0 N *
Set if the value of op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn
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Detailed Instruction Description
CPLB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1)
Integer One's Complement Arithmetic Instructions CPLB op1
op1 BYTE op1 BYTE
CPLB
Description Performs a 1s complement of the source operand specified by op1. The result is stored back into op1. CPU Flags E * E Z V C N Encoding Mnemonic CPLB Format B1 n0 Bytes 2 Z * V 0 C 0 N *
Set if the value of op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn
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Detailed Instruction Description
DISWDT
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Disable Watchdog Timer System Control Instructions DISWDT
none none
DISWDT
Disable the watchdog timer Description This instruction disables the Watchdog Timer. If the WDTCTL bit is cleared, the DISWDT instruction can be executed at any time between the Reset and the first execution of either EINIT or SRVWDT. After execution of either an EINIT or a SRVWDT, the DISWDT instruction will have no effect. If the WDTCTL bit is set, the DISWDT instruction can always be executed regardless of the execution of EINIT or SRVWDT. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E E Z V C N Encoding Mnemonic DISWDT Format A5 5A A5 A5 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
DIV
Group Syntax
Source Operand(s)
16-by-16 Signed Division Arithmetic Instructions DIV op1
op1 WORD MDL WORD MD DOUBLEWORD
DIV
Destination Operand(s) Operation
(MDL) (MDL) / (op1) (MDH) (MDL) mod (op1) Description Performs a signed 16-bit by 16-bit division of the low order word stored in the MD register by the source word operand op1. The signed quotient is then stored in the low order word of the MD register (MDL) and the remainder is stored in the high order word of the MD register (MDH). CPU Flags E 0 E Z V Z * V * C 0 N *
C N
Always cleared. Set if quotient, stored in the MDL register, equals zero. Cleared otherwise. Undefined if the V flag is set. Set if an arithmetic overflow occurred, i.e. the quotient cannot be represented in a word data type (only in case of 8000H/FFFEH), or if the divisor op1 was zero. Cleared otherwise. Always cleared. Set if the most significant bit of the quotient, stored in the MDL register, is set. Cleared otherwise. Undefined if the V flag is set.
Encoding Mnemonic DIV Format 4B nn Bytes 2
Rwn
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Detailed Instruction Description
DIVL
Group Syntax
Source Operand(s)
32-by-16 Signed Division Arithmetic Instructions DIVL op1
op1 WORD MD DOUBLEWORD MD DOUBLEWORD
DIVL
Destination Operand(s) Operation
(MDL) (MD) / (op1) (MDH) (MD) mod (op1) Description Performs an extended signed 32-bit by 16-bit division of the two words stored in the MD register by the source word operand op1. The signed quotient is then stored in the low order word of the MD register (MDL) and the remainder is stored in the high order word of the MD register (MDH). CPU Flags E 0 E Z V Z * V * C 0 N *
C N
Always cleared. Set if quotient, stored in the MDL register, equals zero. Cleared otherwise. Undefined if the V flag is set. Set if an arithmetic overflow occurred, i.e. the quotient cannot be represented in a word data type, or if the divisor op1 was zero. Cleared otherwise. Always cleared. Set if the most significant bit of the quotient, stored in the MDL register, is set. Cleared otherwise. Undefined if the V flag is set.
Encoding Mnemonic DIVL Format 6B nn Bytes 2
Rwn
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Detailed Instruction Description
DIVLU
Group Syntax
Source Operand(s)
32-by-16 Unsigned Division Arithmetic Instructions DIVLU op1
op1 WORD MD DOUBLEWORD MD DOUBLEWORD
DIVLU
Destination Operand(s) Operation
(MDL) (MD) / op1 (MDH) (MD) mod (op1) Description Performs an extended unsigned 32-bit by 16-bit division of the two words stored in the MD register by the source word operand op1. The unsigned quotient is then stored in the low order word of the MD register (MDL) and the remainder is stored in the high order word of the MD register (MDH). CPU Flags E 0 E Z V Z * V * C 0 N *
C N
Always cleared. Set if quotient, stored in the MDL register, equals zero. Cleared otherwise. Undefined if the V flag is set. Set if an arithmetic overflow occurred, i.e. the quotient cannot be represented in a word data type, or if the divisor op1 was zero. Cleared otherwise. Always cleared. Set if the most significant bit of the quotient, stored in the MDL register, is set. Cleared otherwise. Undefined if the V flag is set.
Encoding Mnemonic DIVLU Format 7B nn Bytes 2
Rwn
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Detailed Instruction Description
DIVU
Group Syntax
Source Operand(s)
16-by-16 Unsigned Division Arithmetic Instructions DIVU op1
op1 WORD MDL WORD MD DOUBLEWORD
DIVU
Destination Operand(s) Operation
(MDL) (MDL) / (op1) (MDH) (MDL) mod (op1) Description Performs an unsigned 16-bit by 16-bit division of the low order word stored in the MD register by the source word operand op1. The unsigned quotient is then stored in the low order word of the MD register (MDL) and the remainder is stored in the high order word of the MD register (MDH). CPU Flags E 0 E Z V C N Z * V * C 0 N *
Always cleared. Set if quotient, stored in the MDL register, equals zero. Cleared otherwise. Undefined if the V flag is set. Set if the divisor op1 was zero. Always cleared. Set if the most significant bit of the quotient, stored in the MDL register, is set. Cleared otherwise. Undefined if the V flag is set.
Encoding Mnemonic DIVU Format 5B nn Bytes 2
Rwn
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Detailed Instruction Description
EINIT
Group Syntax
Source Operand(s) Destination Operand(s) Operation End of Initialization
End of Initialization System Control Instructions EINIT
none none
EINIT
Description After a reset, the reset output pin RSTOUT is pulled low. It remains low until the EINIT instruction has been executed at which time it goes high. This enables the software to signal the external circuitry that it has successfully initialized the microcontroller. After EINIT execution, registers can be locked until reset. The DISWDT instruction executed after the first EINIT instruction has effect only if the WDTCTL bit was cleared before the EINIT instruction. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E E Z V C N Encoding Mnemonic EINIT Format B5 4A B5 B5 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
ENWDT
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Enable Watchdog Timer System Control Instructions ENWDT
none none
ENWDT
Enable Watchdog Timer Description If the WDTCTL bit of the CPUCON1 register is cleared, this instruction has no effect. If the WDTCTL bit is set, this instruction enables the Watchdog Timer. Specifically, it allows the Watchdog Timer to be re-enabled after it has been previously disabled by a DISWDT instruction. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E E Z V C N Encoding Mnemonic ENWDT Format 85 7A 85 85 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
EXTP
Group Syntax
Source Operand(s)
Begin EXTended Page Sequence System Control Instructions EXTP op1, op2
op1 10-bit page number op2 2-bit instruction counter none
EXTP
Destination Operand(s) Operation
(count) (op2) [1 op2 4] Disable interrupts and Class A traps Data_Page (op1) DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 Data_Page (DPPx) Enable interrupts and traps Description Overrides the standard DPP addressing scheme of the long and indirect addressing modes for a specified number of instructions. During their execution, both standard and PEC interrupts and class A hardware traps are locked. The EXTP instruction becomes active immediately such that no additional NOPs are required. For any long ('mem') or indirect ([...]) address in the EXTP instruction sequence, the 10-bit page number (address bits A23-A14) is not determined by the contents of a DPP register, but by the value of op1 itself. The 14-bit page offset (address bits A13-A0) is derived from the long or indirect address as usual. The value of op2 defines the length of the affected instruction sequence. CPU Flags E E Z V C N
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Z -
V -
C -
N -
Not affected. Not affected. Not affected. Not affected. Not affected.
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Detailed Instruction Description Encoding Mnemonic EXTP EXTP Format D7 :01##-0 pp 0:00pp DC :01##-m Bytes 4 2
#pag , #irang2 Rwm , #irang2
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Detailed Instruction Description
EXTPR
Group Syntax
Begin EXTended Page and Register Sequence System Control Instructions EXTPR op1, op2
op1 10-bit page number op2 2-bit instruction counter none
EXTPR
Source Operand(s)
Destination Operand(s) Operation
(count) (op2) [1 op2 4] Disable interrupts and Class A traps Data_Page (op1) SFR_range Extended DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 Data_Page (DPPx) SFR_range Standard Enable interrupts and traps Description Overrides the standard DPP addressing scheme of the long and indirect addressing modes and causes all SFR or SFR bit accesses via the 'reg', 'bitoff' or 'bitaddr' addressing modes being made to the Extended SFR space for a specified number of instructions. During their execution, both standard and PEC interrupts and class A hardware traps are locked. For any long ('mem') or indirect ([...]) address in the EXTP instruction sequence, the 10-bit page number (address bits A23-A14) is not determined by the contents of a DPP register, but by the value of op1 itself. The 14-bit page offset (address bits A13-A0) is derived from the long or indirect address as usual. The value of op2 defines the length of the affected instruction sequence. CPU Flags E E Z V
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V -
C -
N -
Not affected. Not affected. Not affected.
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Detailed Instruction Description C N Encoding Mnemonic EXTPR EXTPR Format D7 :11##-0 pp 0:00pp DC :11##-m Bytes 4 2 Not affected. Not affected.
#pag , #irang2 Rwm , #irang2
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Detailed Instruction Description
EXTR
Group Syntax
Source Operand(s)
Begin EXTended Register Sequence System Control Instructions EXTR op1
op1 2-bit instruction counter none
EXTR
Destination Operand(s) Operation
(count) (op1) [1 op1 4] Disable interrupts and Class A traps SFR_range Extended DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 SFR_range Standard Enable interrupts and traps Description Causes all SFR or SFR bit accesses via the 'reg', 'bitoff' or 'bitaddr' addressing modes being made to the Extended SFR space for a specified number of instructions. During their execution, both standard and PEC interrupts and class A hardware traps are locked. The value of op1 defines the length of the affected instruction sequence. CPU Flags E E Z V C N Encoding Mnemonic EXTR Format D1 :10##-0 Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
#irang2
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Detailed Instruction Description
EXTS
Group Syntax
Source Operand(s)
Begin EXTended Segment Sequence System Control Instructions EXTS op1, op2
op1 segment number op2 2-bit instruction counter none
EXTS
Destination Operand(s) Operation
(count) (op2) [1 op2 4] Disable interrupts and Class A traps Data_Segment (op1) DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 Data_Page (DPPx) Enable interrupts and traps Description Overrides the standard DPP addressing scheme of the long and indirect addressing modes for a specified number of instructions. During their execution, both standard and PEC interrupts and class A hardware traps are locked. The EXTS instruction becomes immediately active such that no additional NOPs are required. For any long ('mem') or indirect ([...]) address in an EXTS instruction sequence, the value of op1 determines the 8-bit segment (address bits A23-A16) valid for the corresponding data access. The long or indirect address itself represents the 16-bit segment offset (address bits A15-A0). The value of op2 defines the length of the affected instruction sequence. CPU Flags E E Z V C N Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description Encoding Mnemonic EXTS EXTS Format D7 :00##-0 ss 00 DC :00##-m Bytes 4 2
#seg , #irang2 Rwm , #irang2
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Detailed Instruction Description
EXTSR
Group Syntax
Begin EXTended Segment and Register Sequence System Control Instructions EXTSR op1, op2
op1 segment number op2 2-bit instruction counter none
EXTSR
Source Operand(s)
Destination Operand(s) Operation
(count) (op2) [1 op2 4] Disable interrupts and Class A traps Data_Segment (op1) SFR_range Extended DO WHILE ((count) 0 AND Class_B_Trap_Condition TRUE) Next Instruction (count) (count) - 1 END WHILE (count) 0 Data_Page (DPPx) SFR_range Standard Enable interrupts and traps Description Overrides the standard DPP addressing scheme of the long and indirect addressing modes and causes all SFR or SFR bit accesses via the 'reg', 'bitoff' or 'bitaddr' addressing modes being made to the Extended SFR space for a specified number of instructions. During their execution, both standard and PEC interrupts and class A hardware traps are locked. The EXTSR instruction becomes immediately active such that no additional NOPs are required. For any long ('mem') or indirect ([...]) address in an EXTSR instruction sequence, the value of op1 determines the 8-bit segment (address bits A23-A16) valid for the corresponding data access. The long or indirect address itself represents the 16-bit segment offset (address bits A15-A0). The value of op2 defines the length of the affected instruction sequence. CPU Flags E E Z
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V -
C -
N -
Not affected. Not affected.
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Detailed Instruction Description V C N Encoding Mnemonic EXTSR EXTSR Format D7 :10##-0 ss 00 DC :10##-m Bytes 4 2 Not affected. Not affected. Not affected.
#seg , #irang2 Rwm , #irang2
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Detailed Instruction Description
IDLE
Group Syntax
Source Operand(s) Destination Operand(s) Operation Enter Idle Mode
Enter Idle Mode System Control Instructions IDLE
none none
IDLE
Description This instruction causes the part to enter the idle mode. In this mode, the CPU is powered down while the peripherals remain running. It remains powered down until a peripheral interrupt or external interrupt occurs. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E E Z V C N Encoding Mnemonic IDLE Format 87 78 87 87 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
JB
Group Syntax
Source Operand(s)
Relative Jump if Bit Set Jump Instructions JB op1, op2
op1 BIT op2 8-bit signed displacement none
JB
Destination Operand(s) Operation
IF ((op1) = 1) THEN (IP) (IP) + 2*sign_extend(op2) ELSE Next Instruction END IF Description If the bit specified by op1 is set, program execution continues at the location of the instruction pointer IP, plus the specified displacement op2. The displacement is a 2s complement number which is sign extended and counts the relative distance in words. The value of the IP used in the target address calculation is the address of the instruction following the JB instruction. If the specified bit is cleared, program execution continues normally with the instruction following the JB instruction. CPU Flags E E Z V C N Encoding Mnemonic JB Format 8A QQ rr q0 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
bitaddrQ.q , rel
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Detailed Instruction Description
JBC
Group Syntax
Source Operand(s)
Relative Jump if Bit Set and Clear Bit Jump Instructions JBC op1, op2
op1 BIT op2 8-bit signed displacement none
JBC
Destination Operand(s) Operation
IF ((op1) = 1) THEN (op1) 0 (IP) (IP) + 2*sign_extend(op2) ELSE Next Instruction END IF Description If the bit specified by op1 is set, program execution continues at the location of the instruction pointer IP, plus the specified displacement op2. The bit specified by op1 is cleared, allowing implementation of semaphore operations. The displacement is a 2s complement number which is sign extended and counts the relative distance in words. The value of the IP used in the target address calculation is the address of the instruction following the JBC instruction. If the specified bit was clear, program execution continues normally with the instruction following the JBC instruction. Note: Flags are updated by this instruction even if the branch is not executed. An explicit write operation to the PSW register supersedes the condition flag values which are implicitly generated by the CPU. CPU Flags E 0 E Z V C N Z B V 0 C 0 N B
Always cleared. Contains the logical negation of the previous state of the specified bit. Always cleared. Always cleared. Contains the previous state of the specified bit.
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Detailed Instruction Description Encoding Mnemonic JBC Format AA QQ rr q0 Bytes 4
bitaddrQ.q , rel
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Detailed Instruction Description
JMPA
Group Syntax
Absolute Conditional Jump Jump Instructions JMPA op1, op2
JMPA
Alternative Syntax JMPA+ op1, op2 JMPA- op1, op2
Source Operand(s) op1 extended condition code op2 16-bit address offset none
Destination Operand(s) Operation
IF ((op1) = 1) THEN (IP) op2 ELSE Next Instruction END IF Description If the condition specified by op1 is met, a branch to the absolute address specified by op2 is taken. If the condition is not met, no action is taken, and the instruction following the JMPA instruction is executed normally. A static prediction scheme is used: if the prediction bit 'a' of the instruction long word is cleared then JMPA is assumed 'taken' and if this bit is set to 1 JMPA is assumed 'not taken'. JMPA+ and JMPA- instructions are converted into JMPA assumed 'taken' (bit 'a' cleared) and 'not taken' (bit 'a' set) respectively. For regular JMPA instructions, the assembler applies the following rule: cc_z is predicted 'not taken' meanwhile all other conditions are predicted 'taken'. A prefetch hint bit is also used. This bit is the instruction long word bit 'l' and is required by the fetch unit to deal efficiently with short backward loops. It must be set only if (0 < IP_jmpa - IP_target 32), cleared otherwise. IP_jmpa is the address of the JMPA instruction and IP_target is the target address of JMPA. CPU Flags E E Z V
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Z -
V -
C -
N -
Not affected. Not affected. Not affected.
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Detailed Instruction Description C N Encoding Mnemonic JMPA Format EA d0la MM MM Bytes 4 Not affected. Not affected.
xcc , caddr
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Detailed Instruction Description
JMPI
Group Syntax
Source Operand(s)
Indirect Conditional Jump Jump Instructions JMPI op1, op2
op1 condition code op2 16-bit address offset none
JMPI
Destination Operand(s) Operation
IF ((op1) = 1) THEN (IP) (op2) ELSE Next Instruction END IF Description If the condition specified by op1 is met, a branch to the absolute address specified by op2 is taken. If the condition is not met, no action is taken, and program execution continues normally with the instruction following the JMPI instruction. CPU Flags E E Z V C N Encoding Mnemonic JMPI Format 9C cn Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
cc , [Rwn]
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Detailed Instruction Description
JMPR
Group Syntax
Source Operand(s)
Relative Conditional Jump Jump Instructions JMPR op1, op2
op1 condition code op2 8-bit signed displacement none
JMPR
Destination Operand(s) Operation
IF ((op1) = 1) THEN (IP) (IP) + 2*sign_extend(op2) ELSE Next Instruction END IF Description If the extended condition specified by op1 is met, program execution continues at the location of the instruction pointer, IP, plus the specified displacement, op2. The displacement is a 2s complement number which is sign-extended and counts the relative distance in words. The value of the IP used in the target address calculation is the address of the instruction following the JMPR instruction. If the specified condition is not met, program execution continues normally with the instruction following the JMPR instruction. CPU Flags E E Z V C N Encoding Mnemonic JMPR Format cD rr Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
cc , rel
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Detailed Instruction Description
JMPS
Group Syntax
Source Operand(s)
Absolute Inter-Segment Jump Jump Instructions JMPS op1, op2
op1 segment number op2 16-bit address offset none
JMPS
Destination Operand(s) Operation
IF (CPUCON1.SGTDIS = 0) THEN (CSP) op1 END IF (IP) op2 Description Branches unconditionally to the absolute address specified by op2 within the segment specified by op1. CPU Flags E E Z V C N Encoding Mnemonic JMPS Format FA SS MM MM Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
seg , caddr
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Detailed Instruction Description
JNB
Group Syntax
Source Operand(s)
Relative Jump if Bit Clear Jump Instructions JNB op1, op2
op1 BIT op2 8-bit signed displacement none
JNB
Destination Operand(s) Operation
IF ((op1) = 0) THEN (IP) (IP) + 2*sign_extend(op2) ELSE Next Instruction END IF Description If the bit specified by op1 is clear, program execution continues at the location of the instruction pointer IP, plus the specified displacement op2. The displacement is a 2s complement number which is sign-extended and counts the relative distance in words. The value of the IP used in the target address calculation is the address of the instruction following the JNB instruction. If the specified bit is set, program execution continues normally with the instruction following the JNB instruction. CPU Flags E E Z V C N Encoding Mnemonic JNB Format 9A QQ rr q0 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
bitaddrQ.q , rel
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Detailed Instruction Description
JNBS
Group Syntax
Source Operand(s)
Relative Jump if Bit Clear and Set Bit Jump Instructions JNBS op1, op2
op1 BIT op2 8-bit signed displacement none
JNBS
Destination Operand(s) Operation
IF ((op1) = 0) THEN (op1) 1 (IP) (IP) + 2*sign_extend(op2) ELSE Next Instruction END IF Description If the bit specified by op1 is clear, program execution continues at the location of the instruction pointer IP, plus the specified displacement op2. The bit specified by op1 is set, allowing implementation of semaphore operations. The displacement is a 2s complement number which is sign-extended and counts the relative distance in words. The value of the IP used in the target address calculation is the address of the instruction following the JNBS instruction. If the specified bit was set, program execution continues normally with the instruction following the JNBS instruction. Note: Flags are updated by this instruction even if the branch is not executed. An explicit write operation to the PSW register supersedes the condition flag values which are implicitly generated by the CPU. CPU Flags E 0 E Z V C N Z B V 0 C 0 N B
Always cleared. Contains the logical negation of the previous state of the specified bit. Always cleared. Always cleared. Contains the previous state of the specified bit.
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Detailed Instruction Description Encoding Mnemonic JNBS Format BA QQ rr q0 Bytes 4
bitaddrQ.q , rel
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Detailed Instruction Description
MOV
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Move Data Data Movement Instructions MOV op1, op2
op2 WORD op1 WORD
MOV
Description Moves the contents of the source operand specified by op2 to the location specified by the destination operand op1. The contents of the moved data are examined, and the flags are updated accordingly. CPU Flags E * E Z V C N Z * V C N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the source operand op2 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the source operand op2 is set. Cleared otherwise.
Encoding Mnemonic MOV MOV MOV MOV MOV MOV MOV Format E0 #n F0 nm D4 nm ## ## 98 nm A8 nm 88 nm C4 nm ## ## Bytes 2 2 4 2 2 2 4
Rwn , #data4 Rwn , Rwm Rwn , [Rwm+#data16] Rwn , [Rwm+] Rwn , [Rwm] [-Rwm] , Rwn [Rwm+#data16] , Rwn
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Detailed Instruction Description MOV MOV MOV MOV MOV MOV MOV MOV MOV [Rwm] , Rwn [Rwn+] , [Rwm] [Rwn] , [Rwm+] [Rwn] , [Rwm] [Rwn] , mem mem , [Rwn] mem , reg reg , #data16 reg , mem B8 nm D8 nm E8 nm C8 nm 84 0n MM MM 94 0n MM MM F6 RR MM MM E6 RR ## ## F2 RR MM MM 2 2 2 2 4 4 4 4 4
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Detailed Instruction Description
MOVB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Move Data Data Movement Instructions MOVB op1, op2
op2 BYTE op1 BYTE
MOVB
Description Moves the contents of the source operand specified by op2 to the location specified by the destination operand op1. The contents of the moved data are examined, and the flags are updated accordingly. CPU Flags E * E Z V C N Z * V C N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the source operand op2 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the source operand op2 is set. Cleared otherwise.
Encoding Mnemonic MOVB MOVB MOVB MOVB MOVB MOVB MOVB Format E1 #n F1 nm F4 nm ## ## 99 nm A9 nm 89 nm E4 nm ## ## Bytes 2 2 4 2 2 2 4
Rbn , #data4 Rbn , Rbm Rbn , [Rwm + #data16] Rbn , [Rwm+] Rbn , [Rwm] [-Rwm] , Rbn [Rwm + #data16] , Rbn
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Detailed Instruction Description MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB MOVB [Rwm] , Rbn [Rwn+] , [Rwm] [Rwn] , [Rwm+] [Rwn] , [Rwm] [Rwn] , mem mem , [Rwn] mem , reg reg , #data8 reg , mem B9 nm D9 nm E9 nm C9 nm A4 0n MM MM B4 0n MM MM F7 RR MM MM E7 RR ## xx F3 RR MM MM 2 2 2 2 4 4 4 4 4
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Detailed Instruction Description
MOVBS
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Move Byte Sign Extend Data Movement Instructions MOVBS op1, op2
op2 BYTE op1 WORD
MOVBS
(low byte op1) (op2) IF ((op2[7]) = 1) THEN (high byte op1) FFH ELSE (high byte op1) 00H END IF Description Moves and sign-extends the contents of the source byte operand specified by op2 to the word location specified by the destination operand op1. The contents of the moved data are examined, and the flags are updated accordingly. CPU Flags E 0 E Z V C N Z * V C N *
Always cleared. Set if the value of the source byte operand op2 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the source operand op2 is set. Cleared otherwise.
Encoding Mnemonic MOVBS MOVBS MOVBS Format D0 mn D5 RR MM MM D2 RR MM MM Bytes 2 4 4
Rwn , Rbm mem , reg reg , mem
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Detailed Instruction Description
MOVBZ
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Move Byte Zero Extend Data Movement Instructions MOVBZ op1, op2
op2 BYTE op1 WORD
MOVBZ
(low byte op1) (op2) (high byte op1) 00H Description Moves and zero-extends the contents of the source byte operand specified by op2 to the word location specified by the destination operand op1. The contents of the moved data are examined, and the flags are updated accordingly. CPU Flags E 0 E Z V C N Encoding Mnemonic MOVBZ MOVBZ MOVBZ Format C0 mn C5 RR MM MM C2 RR MM MM Bytes 2 4 4 Z * V C N 0
Always cleared. Set if the value of the source byte operand op2 equals zero. Cleared otherwise. Not affected. Not affected. Always cleared.
Rwn , Rbm mem , reg reg , mem
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Detailed Instruction Description
MUL
Group Syntax
Source Operand(s) Destination Operand(s) Operation (MD) (op1) * (op2)
Signed Multiplication Arithmetic Instructions MUL op1, op2
op1, op2 WORD MD DOUBLEWORD
MUL
Description Performs a 16-bit by 16-bit signed multiplication using the two words specified by operands op1 and op2 respectively. The signed 32-bit result is placed in the MD register. CPU Flags E 0 E Z V C N Encoding Mnemonic MUL Format 0B nm Bytes 2 Z * V * C 0 N *
Always cleared. Set if result equals zero. Cleared otherwise. This bit is set if the result cannot be represented in a word data type. Cleared otherwise. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm
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Detailed Instruction Description
MULU
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiplication Arithmetic Instructions MULU op1, op2
op1, op2 WORD MD DOUBLEWORD
MULU
(MD) (op1) * (op2) Description Performs a 16-bit by 16-bit unsigned multiplication using the two words specified by operands op1 and op2 respectively. The unsigned 32-bit result is placed in the MD register. CPU Flags E 0 E Z V C N Encoding Mnemonic MULU Format 1B nm Bytes 2 Z * V * C 0 N *
Always cleared. Set if result equals zero. Cleared otherwise. This bit is set if the result cannot be represented in a word data type. Cleared otherwise. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm
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Detailed Instruction Description
NEG
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) 0 - (op1)
Integer Two's Complement Arithmetic Instructions NEG op1
op1 WORD op1 WORD
NEG
Description Performs a binary 2s complement of the source operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic NEG Format 81 n0 Bytes 2 Z * V * C * N *
Set if the value of op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn
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Detailed Instruction Description
NEGB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) 0 - (op1)
Integer Two's Complement Arithmetic Instructions NEGB op1
op1 BYTE op1 BYTE
NEGB
Description Performs a binary 2s complement of the source operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic NEGB Format A1 n0 Bytes 2 Z * V * C * N *
Set if the value of op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the byte data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn
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Detailed Instruction Description
NOP
Group Syntax
Source Operand(s) Destination Operand(s) Operation No Operation
No Operation Null operation NOP
none none
NOP
Description This instruction causes a null operation to be performed. A null operation causes no change in the status of the flags. CPU Flags E E Z V C N Encoding Mnemonic NOP Format CC 00 Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
OR
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Logical OR Logical Instructions OR op1, op2
op1, op2 WORD op1 WORD
OR
Description Performs a bitwise logical OR of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic OR OR OR OR OR OR OR Format 78 n:0### 70 nm 78 n:11ii 78 n:10ii 74 RR MM MM 76 RR ## ## 72 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
ORB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) (op2)
Logical OR Logical Instructions ORB op1, op2
op1, op2 BYTE op1 BYTE
ORB
Description Performs a bitwise logical OR of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic ORB ORB ORB ORB ORB ORB ORB Format 79 n:0### 71 nm 79 n:11ii 79 n:10ii 75 RR MM MM 77 RR ## xx 73 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
PCALL
Group Syntax
Source Operand(s)
Push Word and Call Subroutine Absolute Call Instructions PCALL op1, op2
op1 WORD op2 16-bit address offset none
PCALL
Destination Operand(s) Operation
(tmp) (op1) (SP) (SP) - 2 ((SP)) (tmp) (SP) (SP) - 2 ((SP)) (IP) (IP) op2 Description Pushes the word specified by operand op1 and the value of the instruction pointer, IP, onto the system stack, and branches to the absolute memory location specified by the second operand op2. Because IP always points to the instruction following the branch instruction, the value stored on the system stack represents the return address of the calling routine. CPU Flags E * E Z * V C N *
Z V C N
Set if the value of the pushed operand op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the pushed operand op1 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the pushed operand op1 is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic PCALL Format E2 RR MM MM Bytes 4
reg , caddr
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Detailed Instruction Description
POP
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Pop Word from System Stack System Stack Instructions POP op1
none op1 WORD
POP
(tmp) ((SP)) (SP) (SP) + 2 (op1) (tmp) Description Pops one word from the system stack specified by the Stack Pointer into the operand specified by op1. The Stack Pointer is then incremented by two. CPU Flags E * E Z V C N Z * V C N *
Set if the value of the popped word represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the popped word equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the popped word is set. Cleared otherwise.
Encoding Mnemonic POP Format FC RR Bytes 2
reg
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Detailed Instruction Description
PRIOR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Prioritize Register Prioritize Instruction PRIOR op1, op2
op2 WORD op1 WORD
PRIOR
(tmp) (op2) (count) 0 DO WHILE (((tmp[15]) 1) AND ((op2) 0))) (tmp[n]) (tmp[n-1]) [n=15...1] (count) (count) + 1 END WHILE (op1) (count) Description This instruction stores a count value in the word operand specified by op1. This count value indicates the number of single bit shifts required to normalize the word operand op2 so that its most significant bit is equal to one. If the source operand op2 equals zero, a zero is written to operand op1 and the zero flag is set. Otherwise, the zero flag is cleared. CPU Flags E 0 E Z V C N Encoding Mnemonic PRIOR Format 2B nm Bytes 2 Z * V 0 C 0 N 0
Always cleared. Set if the value of the source operand op2 equals zero. Cleared otherwise. Always cleared. Always cleared. Always cleared.
Rwn , Rwm
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Detailed Instruction Description
PUSH
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op1) (SP) (SP) - 2 ((SP)) (tmp)
Push Word on System Stack System Stack Instructions PUSH op1
op1 WORD none
PUSH
Description Moves the word specified by operand op1 to the location in the system stack specified by the Stack Pointer, after the Stack Pointer has been decremented by two. CPU Flags E * E Z * V C N *
Z V C N
Set if the value of the pushed operand op1 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the pushed operand op1 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the pushed operand op1 is set. Cleared otherwise.
Encoding Mnemonic PUSH Format EC RR Bytes 2
reg
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Detailed Instruction Description
PWRDN
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Enter Power Down Mode System Control Instructions PWRDN
none none
PWRDN
Enter Power Down Mode Description This instruction causes the device to enter the power down mode. In this mode, all peripherals and the CPU are powered down until the device is externally reset. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. To further control the action of this instruction, the PWRDN instruction is only enabled when the non-maskable interrupt pin (NMI) is in the low state. Otherwise, this instruction has no effect. CPU Flags E E Z V C N Encoding Mnemonic PWRDN Format 97 68 97 97 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
RET
Group Syntax
Source Operand(s) Destination Operand(s) Operation (IP) ((SP)) (SP) (SP) + 2
Return from Subroutine Return Instructions RET
none none
RET
Description Returns from a subroutine. The IP is popped from the system stack. CPU Flags E E Z V C N Encoding Mnemonic RET Format CB 00 Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
RETI
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Return from Interrupt Subroutine Return Instructions RETI
none none
RETI
(IP) ((SP)) (SP) (SP) + 2 IF (CPUCON1.SGTDIS = 0) THEN (CSP) ((SP)) (SP) (SP) + 2 END IF (PSW) ((SP)) (SP) (SP) + 2 Description Returns from an interrupt routine. The IP, CSP, and PSW are popped off the system stack. The CSP is only popped if segmentation is enabled. This is indicated by the SGTDIS bit in the CPUCON1 register. CPU Flags E * E Z V C N Encoding Mnemonic RETI Format FB 88 Bytes 2 Z * V * C * N *
Restored from the PSW popped from stack. Restored from the PSW popped from stack. Restored from the PSW popped from stack. Restored from the PSW popped from stack. Restored from the PSW popped from stack.
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Detailed Instruction Description
RETP
Group Syntax
Source Operand(s)
Return from Subroutine and Pop Word Return Instructions RETP op1
none op1 WORD
RETP
Destination Operand(s) Operation
(IP) ((SP)) (SP) (SP) + 2 (tmp) ((SP)) (SP) (SP) + 2 (op1) (tmp) Description Returns from a subroutine. First the IP is popped from the system stack and then the next word is popped from the system stack into the operand specified by op1. CPU Flags E * E Z V C N Z * V C N *
Set if the value of the popped word represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the popped word equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the popped word is set. Cleared otherwise.
Encoding Mnemonic RETP Format EB RR Bytes 2
reg
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Detailed Instruction Description
RETS
Group Syntax
Source Operand(s)
Return from Inter-Segment Subroutine Return Instructions RETS
none none
RETS
Destination Operand(s) Operation
(IP) ((SP)) (SP) (SP) + 2 IF (CPUCON1.SGTDIS = 0) THEN (CSP) ((SP)) END IF (SP) (SP) + 2 Description Returns from an inter-segment subroutine. The IP and CSP are popped from the system stack. CPU Flags E E Z V C N Encoding Mnemonic RETS Format DB 00 Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
ROL
Group Syntax
Source Operand(s)
Rotate Left Shift and Rotate Instructions ROL op1, op2
op1 WORD op2 shift counter op1 WORD
ROL
Destination Operand(s) Operation
(count) (op2) (C) 0 DO WHILE ((count) 0) (C) (op1[15]) (op1[n]) (op1[n-1]) [n=15...1] (op1[0]) (C) (count) (count) - 1 END WHILE Description Rotates the destination word operand op1 the number of times as specified by the source operand op2. Bit 15 is rotated into Bit 0 and into the Carry. Only shift values between 0 and 15 are allowed. When using a GPR as the count control, only the least significant four bits are used. CPU Flags E 0 E Z V C N Z * V 0 C S N *
Always cleared. Set if result equals zero. Cleared otherwise. Always cleared. The carry flag is set according to the last most significant bit shifted out of op1. Cleared for a shift count of zero. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic ROL ROL Format 1C #n 0C nm Bytes 2 2
Rwn , #data4 Rwn , Rwm
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Detailed Instruction Description
ROR
Group Syntax
Source Operand(s)
Rotate Right Shift and Rotate Instructions ROR op1, op2
op1 WORD op2 shift counter op1 WORD
ROR
Destination Operand(s) Operation
(count) (op2) (C) 0 (V) 0 DO WHILE ((count) 0) (V) (V) (C) (C) (op1[0]) (op1[n]) (op1[n+1]) [n=0...14] (op1[15]) (C) (count) (count) - 1 END WHILE Description Rotates the destination word operand op1 right by the number of times as specified by the source operand op2. Bit 0 is rotated into Bit 15 and into the Carry. Only shift values between 0 and 15 are allowed. When using a GPR as the count control, only the least significant four bits are used. CPU Flags E 0 E Z V C N Z * V S C S N *
Always cleared. Set if result equals zero. Cleared otherwise. Set if in any cycle of the rotate operation a 1 is shifted out of the carry flag. Cleared for a rotate count of zero. The carry flag is set according to the last least significant bit shifted out of op1. Cleared for a shift count of zero. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic ROR ROR Format 3C #n 2C nm Bytes 2 2
Rwn , #data4 Rwn , Rwm
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Detailed Instruction Description
SBRK
Group Syntax
Source Operand(s) Destination Operand(s) Operation Software Break
Software Break System Control Instructions SBRK
none none
SBRK
Description If the SBRK instruction is enabled by the One Chip Emulator (OCE), then the break mode is activated. If SBRK is not enabled by the OCE, then the hardware trap "soft break" (Class A, Vector 8) is activated. For more details about this instruction, see the OCE specifications. CPU Flags E E Z V C N Encoding Mnemonic SBRK Format 8C 00 Bytes 2 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
SCXT
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp1) (op1) (tmp2) (op2) (SP) (SP) - 2 ((SP)) (tmp1) (op1) (tmp2)
Switch Context System Stack Instructions SCXT op1, op2
op1, op2 WORD op1 WORD
SCXT
Description Switches contexts of any register. Switching context is a push and load operation. The contents of the register specified by the first operand op1, are pushed onto the stack. That register is then loaded with the value specified by the second operand, op2. CPU Flags E E Z V C N Encoding Mnemonic SCXT SCXT Format C6 RR ## ## D6 RR MM MM Bytes 4 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
reg , #data16 reg , mem
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Detailed Instruction Description
SHL
Group Syntax
Source Operand(s)
Shift Left Shift and Rotate Instructions SHL op1, op2
op1 WORD op2 shift counter op1 WORD
SHL
Destination Operand(s) Operation
(count) (op2) (C) 0 DO WHILE ((count) 0) (C) (op1[15]) (op1[n]) (op1[n-1]) [n=15...1] (op1[0]) 0 (count) (count) - 1 END WHILE Description Shifts the destination word operand op1 the number of times as specified by the source operand op2. The least significant bits of the result are filled with zeros accordingly. The most significant bit is shifted into the Carry. Only shift values between 0 and 15 are allowed. When using a GPR as the count control, only the least significant four bits are used. CPU Flags E 0 E Z V C N Z * V 0 C S N *
Always cleared. Set if result equals zero. Cleared otherwise. Always cleared. The carry flag is set according to the last most significant bit shifted out of op1. Cleared for a shift count of zero. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic SHL SHL Format 5C #n 4C nm Bytes 2 2
Rwn , #data4 Rwn , Rwm
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Detailed Instruction Description
SHR
Group Syntax
Source Operand(s)
Shift Right Shift and Rotate Instructions SHR op1, op2
op1 WORD op2 shift counter op1 WORD
SHR
Destination Operand(s) Operation
(count) (op2) (C) 0 (V) 0 DO WHILE ((count) 0) (V) (C) (V) (C) (op1[0]) (op1[n]) (op1[n+1]) [n=0...14] (op1[15]) 0 (count) (count) - 1 END WHILE Description Shifts the destination word operand op1 right by the number of times as specified by the source operand op2. The most significant bits of the result are filled with zeros accordingly. Since the bits shifted out effectively represent the remainder, the Overflow flag is used instead as a Rounding flag. A shift right is a division by a power of two. The overflow flag with the carry flag allows determination of whether the fractional part of the division result is greater than, less than, or equal to one half (0.5 in decimal base). This allows rounding of the division result accordingly. Only shift values between 0 and 15 are allowed. When using a GPR as the count control, only the least significant four bits are used. CPU Flags E 0 E Z V Z * V S C S N *
Always cleared. Set if result equals zero. Cleared otherwise. Set if in any cycle of the shift operation a 1 is shifted out of the carry flag. Cleared in case of a shift count equal 0.
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Detailed Instruction Description C N Encoding Mnemonic SHR SHR Format 7C #n 6C nm Bytes 2 2 The carry flag is set according to the last least significant bit shifted out of op1. Cleared for a shift count of zero. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data4 Rwn , Rwm
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Detailed Instruction Description
SRST
Group Syntax
Source Operand(s) Destination Operand(s) Operation Software Reset
Software Reset System Control Instructions SRST
none none
SRST
Description This instruction is used to perform a software reset. A software reset has the same effect on the microcontroller as an externally applied hardware reset. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E 0 E Z V C N Encoding Mnemonic SRST Format B7 48 B7 B7 Bytes 4 Always cleared. Always cleared. Always cleared. Always cleared. Always cleared. Z 0 V 0 C 0 N 0
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Detailed Instruction Description
SRVWDT
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Service Watchdog Timer System Control Instructions SRVWDT
none none
SRVWDT
Service Watchdog Timer Description This instruction reloads the high order byte of the Watchdog Timer with a preset value and clears the low byte. After this instruction has been executed and if the WDTCTL bit of the CPUCON1 register is cleared, the Watchdog Timer cannot be disabled regardless of the execution of SRVWDT. If the WDTCTL bit is set, the Watchdog Timer can still be disabled. To ensure that this instruction is not accidentally executed, it is implemented as a protected instruction. CPU Flags E E Z V C N Encoding Mnemonic SRVWDT Format A7 58 A7 A7 Bytes 4 Not affected. Not affected. Not affected. Not affected. Not affected. Z V C N -
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Detailed Instruction Description
SUB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) - (op2)
Integer Subtraction Arithmetic Instructions SUB op1, op2
op1, op2 WORD op1 WORD
SUB
Description Performs a 2s complement binary subtraction of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic SUB SUB SUB SUB SUB SUB SUB Format 28 n:0### 20 nm 28 n:11ii 28 n:10ii 24 RR MM MM 26 RR ## ## 22 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
SUBB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op1) - (op2)
Integer Subtraction Arithmetic Instructions SUBB op1, op2
op1, op2 BYTE op1 BYTE
SUBB
Description Performs a 2s complement binary subtraction of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic SUBB SUBB SUBB SUBB SUBB SUBB SUBB Format 29 n:0### 21 nm 29 n:11ii 29 n:10ii 25 RR MM MM 27 RR ## xx 23 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
SUBC
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Integer Subtraction with Carry Arithmetic Instructions SUBC op1, op2
op1, op2 WORD op1 WORD
SUBC
(op1) (op1) - (op2) - (C) Description Performs a 2s complement binary subtraction of the source operand specified by op2 and the previously generated carry bit from the destination operand specified by op1. The result is then stored in op1. This instruction can be used to perform multiple precision arithmetic. CPU Flags E * E Z V C N Encoding Mnemonic SUBC SUBC SUBC SUBC SUBC SUBC SUBC Format 38 n:0### 30 nm 38 n:11ii 38 n:10ii 34 RR MM MM 36 RR ## ## 32 RR MM MM Bytes 2 2 2 2 4 4 4 Z S V * C S N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero and previous Z flag was set. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
SUBCB
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Integer Subtraction with Carry Arithmetic Instructions SUBCB op1, op2
op1, op2 BYTE op1 BYTE
SUBCB
(op1) (op1) - (op2) - (C) Description Performs a 2s complement binary subtraction of the source operand specified by op2 and the previously generated carry bit from the destination operand specified by op1. The result is then stored in op1. This instruction can be used to perform multiple precision arithmetic. CPU Flags E * E Z V C N Encoding Mnemonic SUBCB SUBCB SUBCB SUBCB SUBCB SUBCB SUBCB
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Z S
V *
C S
N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero and the previous Z flag was set. Cleared otherwise. Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the word data type. Cleared otherwise. Set if a borrow is generated. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
Format 39 n:0### 31 nm 39 n:11ii 39 n:10ii 35 RR MM MM 37 RR ## xx 33 RR MM MM
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TRAP
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Software Trap Call Instructions TRAP op1
op1 7-bit trap number none
TRAP
(SP) (SP) - 2 ((SP) (PSW) IF (CPUCON1.SGTDIS = 0) THEN (SP) (SP) - 2 ((SP)) (CSP) END IF (CSP) (VSEG) (SP) (SP) - 2 ((SP)) (IP) (IP) ((op1) * 4) <User Manual
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Detailed Instruction Description Encoding Mnemonic TRAP Format 9B t:ttt0 Bytes 2
#trap7
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Detailed Instruction Description
XOR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Logical Exclusive OR Logical Instructions XOR op1, op2
op1, op2 WORD op1 WORD
XOR
(op1) (op1) (op2) Description Performs a bitwise logical EXCLUSIVE OR of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic XOR XOR XOR XOR XOR XOR XOR Format 58 n:0### 50 nm 58 n:11ii 58 n:10ii 54 RR MM MM 56 RR ## ## 52 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , #data3 Rwn , Rwm Rwn , [Rwi+] Rwn , [Rwi] mem , reg reg , #data16 reg , mem
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Detailed Instruction Description
XORB
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Logical Exclusive OR Logical Instructions XORB op1, op2
op1, op2 BYTE op1 BYTE
XORB
(op1) (op1) (op2) Description Performs a bitwise logical EXCLUSIVE OR of the source operand specified by op2 and the destination operand specified by op1. The result is then stored in op1. CPU Flags E * E Z V C N Encoding Mnemonic XORB XORB XORB XORB XORB XORB XORB Format 59 n:0### 51 nm 59 n:11ii 59 n:10ii 55 RR MM MM 57 RR ## xx 53 RR MM MM Bytes 2 2 2 2 4 4 4 Z * V 0 C 0 N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if result equals zero. Cleared otherwise. Always cleared. Always cleared. Set if the most significant bit of the result is set. Cleared otherwise.
Rbn , #data3 Rbn , Rbm Rbn , [Rwi+] Rbn , [Rwi] mem , reg reg , #data8 reg , mem
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Detailed Instruction Description
8.2
DSP Instruction Set
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Detailed Instruction Description
CoABS
Group Syntax
Source Operand(s) Destination Operand(s) Operation (ACC) Abs(ACC)
Absolute Value Arithmetic Instructions CoABS
ACC 40-bit signed value ACC 40-bit signed value
CoABS
Description Computes the absolute value of the 40-bit ACC contents. MAC Flags MV * MV MSL MSL * ME * MSV * MC 0 MZ * MN * Sat. yes
Set if the ACC contents was 80 0000 0000H. Cleared otherwise. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if the ACC contents was 80 0000 0000H. Not affected otherwise. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoABS Format A3 00 1A rrr0:0000 Bytes 4
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Detailed Instruction Description
CoABS
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Absolute Value Arithmetic Instructions CoABS op1, op2
op1, op2 WORD ACC 40-bit signed value
CoABS
(ACC) Abs((op2) || (op1)) Description Computes the absolute value of a 40-bit source operand and loads the result in the 40-bit ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoABS CoABS CoABS Format A3 nm CA rrr0:0000 83 nm CA rrr0:0qqq 93 Xm CA rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoADD
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) (ACC) + (tmp)
Add Arithmetic Instructions CoADD op1, op2
op1, op2 WORD ACC 40-bit signed value
CoADD
Description Adds a 40-bit operand to the 40-bit ACC register contents and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoADD CoADD CoADD Format A3 nm 02 rrr0:0000 83 nm 02 rrr0:0qqq 93 Xm 02 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoADD2
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) 2 * ((op2) || (op1)) (ACC) (ACC) + (tmp)
Add Arithmetic Instructions CoADD2 op1, op2
op1, op2 WORD ACC 40-bit signed value
CoADD2
Description Adds a 40-bit operand to the 40-bit ACC register contents and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is then multiplied by two before being added to ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoADD2 CoADD2 CoADD2 Format A3 nm 42 rrr0:0000 83 nm 42 rrr0:0qqq 93 Xm 42 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoASHR
Group Syntax
Accumulator Arithmetic Shift Right with Round Shift Instructions CoASHR op1, rnd
op1 shift counter ACC 40-bit signed value
CoASHR
Source Operand(s) Destination Operand(s) Operation
(count) (op1) (C) 0 DO WHILE (count) 0 (ACC[n]) (ACC[n+1]) [n=0...38] (count) (count) -1 END WHILE (ACC) (ACC) + 0000 8000h (MAL) 0 Description Arithmetically shifts the ACC register right by the number of times as specified by the operand op1. Then, the result is 2s complement rounded before being stored in the 40-bit ACC register. To preserve the sign of the ACC register, the most significant bits of the result are filled with sign 0 if the original most significant bit was a 0 or with sign 1 if the original most significant bit was 1. Only shift values from 0 to 16 (inclusive) are allowed. op1 can be either a 5-bit unsigned immediate data (the shift range is from 0 to 16 in this case) or the four least significant bits (the shift range is from 0 to 15 in that case) of any register directly or indirectly addressed operand. MAC Flags MV * MV MSL MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred. Cleared otherwise. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated when rounding. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoASHR CoASHR CoASHR Format A3 00 B2 rrr#:# A3 nn BA rrr0:0000 83 mm BA rrr0:0qqq Bytes 4 4 4
#data5 , rnd Rwn , rnd [Rwm*] , rnd
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CoASHR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Accumulator Arithmetic Shift Right Shift Instructions CoASHR op1
op1 shift counter ACC 40-bit signed value
CoASHR
(count) (op1) (C) 0 DO WHILE (count) 0 (ACC[n]) (ACC[n+1]) [n=0...38] (count) (count) -1 END WHILE Description Arithmetically shifts the ACC register right by the number of times as specified by the operand op1. To preserve the sign of the ACC register, the most significant bits of the result are filled with sign 0 if the original most significant bit was a 0 or with sign 1 if the original most significant bit was 1. Only shift values from 0 to 16 (inclusive) are allowed. op1 can be either a 5-bit unsigned immediate data (the shift range is from 0 to 16 in this case) or the four least significant bits (the shift range is from 0 to 15 in that case) of any register directly or indirectly addressed operand. The MS bit of the MCW register does not affect the result. MAC Flags MV 0 MV MSL ME MSV MC MZ MN MSL ME * MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Set if the MAE is used. Cleared otherwise. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoASHR CoASHR CoASHR Format A3 00 A2 rrr#:# A3 nn AA rrr0:0000 83 mm AA rrr0:0qqq Bytes 4 4 4
#data5 Rwn [Rwm*]
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Detailed Instruction Description
CoCMP
Group Syntax
Source Operand(s) Destination Operand(s) Operation tmp (op2) || (op1) (ACC) (tmp)
Compare Compare Instructions CoCMP op1, op2
op1, op2 WORD none
CoCMP
Description Subtracts a 40-bit signed operand from the 40-bit ACC contents and updates the N, Z and C flags of the MSW register leaving the ACC register unchanged. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The MS bit of the MCW register does not affect the result. MAC Flags MV * MV MSL ME MSV MC * MZ * MN * Sat. no
Set if the ACC contents are strictly less than the 40-bit operand. Cleared otherwise. MSL Not affected. ME Not affected. MSV Not affected. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoCMP CoCMP CoCMP Format A3 nm C2 rrr0:0000 83 nm C2 rrr0:0qqq 93 Xm C2 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoLOAD
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) 0 + (tmp)
Load Accumulator Arithmetic Instructions CoLOAD op1, op2
op1, op2 WORD ACC 40-bit signed value
CoLOAD
Description Loads the 40-bit ACC register with a 40-bit source operand. The 40-bit source operand is the sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoLOAD CoLOAD CoLOAD Format A3 nm 22 rrr0:0000 83 nm 22 rrr0:0qqq 93 Xm 22 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoLOADGroup Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) 0 - (tmp)
Load Accumulator Arithmetic Instructions CoLOAD- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoLOAD-
Description Loads the 40-bit ACC register with a 40-bit source operand. The 40-bit source operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit source operand is 2s complemented, before being stored in the ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC * MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoLOADCoLOADCoLOADFormat A3 nm 2A rrr0:0000 83 nm 2A rrr0:0qqq 93 Xm 2A rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoLOAD2
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Load Accumulator Arithmetic Instructions CoLOAD2 op1, op2
op1, op2 WORD ACC 40-bit signed value
CoLOAD2
(tmp) 2 * ((op2) || (op1) ) (ACC) 0 + (tmp) Description Loads the 40-bit ACC register with a 40-bit source operand. The 40-bit source operand is a sign-extended results of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is also multiplied by two, before being stored in the ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoLOAD2 CoLOAD2 CoLOAD2 Format A3 nm 62 rrr0:0000 83 nm 62 rrr0:0qqq 93 Xm 62 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoLOAD2Group Syntax
Source Operand(s) Destination Operand(s) Operation
Load Accumulator Arithmetic Instructions CoLOAD2- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoLOAD2-
(tmp) 2 * ((op2) || (op1) ) (ACC) 0 - (tmp) Description Loads the 40-bit ACC register with a 40-bit source operand. The 40-bit source operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is also multiplied by two and negated, before being stored in the ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC * MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoLOAD2CoLOAD2CoLOAD2Format A3 nm 6A rrr0:0000 83 nm 6A rrr0:0qqq 93 Xm 6A rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMAC
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate with Round Multiply/Multiply-Accumulate Instructions CoMAC op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMAC
IF (MP = 1) THEN (tmp) ((op1) * (op2)) <<1 (ACC) (ACC) + (tmp) + 00 0000 8000h ELSE (tmp) (op1) * (op2) (ACC) (ACC) + (tmp) + 00 0000 8000h END IF (MAL) 0 Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; then, it is added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMAC CoMAC CoMAC Format A3 nm D1 rrr0:0000 83 nm D1 rrr0:0qqq 93 Xm D1 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMAC
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMAC op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMAC
IF (MP = 1) THEN (tmp) ((op1) * (op2)) <<1 (ACC) (ACC) + (tmp) ELSE (tmp) (op1) * (op2) (ACC) (ACC) + (tmp) END IF Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; then, it is added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMAC CoMAC CoMAC Format A3 nm D0 rrr0:0000 83 nm D0 rrr0:0qqq 93 Xm D0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMAC- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMAC-
IF (MP = 1) THEN (tmp) ((op1) * (op2)) <<1 (ACC) (ACC) - (tmp) ELSE (tmp) (op1) * (op2) (ACC) (ACC) - (tmp) END IF Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; then, it is subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACCoMACCoMACFormat A3 nm E0 rrr0:0000 83 nm E0 rrr0:0qqq 93 Xm E0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACM
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACM op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACM
Destination Operand(s) Operation
IF (MP = 1) THEN (tmp) (((op1)) * ((op2))) <<1 (ACC) (ACC) + (tmp) + 00 0000 8000h ELSE (tmp) ((op1))*((op2)) (ACC) (ACC) + (tmp) + 00 0000 8000h END IF (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; and next, it is added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise.
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Detailed Instruction Description MN Encoding Mnemonic CoMACM Format 93 Xm D9 rrr0:0qqq Bytes 4 Set if the most significant bit of the result is set. Cleared otherwise.
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACM
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACM op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACM
IF (MP = 1) THEN (tmp) (((op1)) * ((op2))) <<1 (ACC) (ACC) + (tmp) ELSE (tmp) ((op1)) * ((op2)) (ACC) (ACC) + (tmp) END IF ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then if the MP flag is set, it is one-bit left shifted; and next it is added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACM Format 93 Xm D8 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACM- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACM-
IF (MP = 1) THEN (tmp) (((op1)) * ((op2))) <<1 (ACC) (ACC) - (tmp) ELSE (tmp) ((op1)) * ((op2)) (ACC) (ACC) - (tmp) END IF ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; and next, it is subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMFormat 93 Xm E8 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMR
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACMR op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACMR
Destination Operand(s) Operation
IF (MP = 1) THEN (tmp) (((op1)) * ((op2))) <<1 (ACC) (tmp) - (ACC) + 00 0000 8000h ELSE (tmp) ((op1))*((op2)) (ACC) (tmp) - (ACC) + 00 0000 8000h END IF (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; and next, the 40-bit ACC register contents are subtracted from the result Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise.
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Detailed Instruction Description MZ MN Encoding Mnemonic CoMACMR Format 93 Xm F9 rrr0:0qqq Bytes 4 Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACMR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMR op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMR
IF (MP = 1) THEN (tmp) (((op1)) * ((op2))) <<1 (ACC) (tmp) - (ACC) ELSE (tmp) ((op1)) * ((op2)) (ACC) (tmp) - (ACC) END IF ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; and next, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMR Format 93 Xm F8 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMRsu
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round
CoMACMRsu
Multiply/Multiply-Accumulate Instructions CoMACMRsu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
Destination Operand(s) Operation
(tmp) ((op1)) * ((op2)) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMRsu [IDXi*], [Rwm*] , rnd Format 93 Xm 79 rrr0:0qqq Bytes 4
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Detailed Instruction Description
CoMACMRsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move
CoMACMRsu
Multiply/Multiply-Accumulate Instructions CoMACMRsu op1, op2
op1, op2 WORD ACC 40-bit signed value
(tmp) ((op1)) * ((op2)) (ACC) (tmp) - (ACC) ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMRsu [IDXi*], [Rwm*] Format 93 Xm 78 rrr0:0qqq Bytes 4
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Detailed Instruction Description
CoMACMRu
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACMRu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACMRu
Destination Operand(s) Operation
(tmp) ((op1))*((op2)) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMRu Format 93 Xm 39 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACMRu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMRu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMRu
(tmp) ((op1))*((op2)) (ACC) (tmp) - (ACC) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMRu Format 93 Xm 38 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMRus
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round
CoMACMRus
Multiply/Multiply-Accumulate Instructions CoMACMRus op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
Destination Operand(s) Operation
(tmp) ((op1)) * ((op2)) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMRus [IDXi*], [Rwm*] , rnd Format 93 Xm B9 rrr0:0qqq Bytes 4
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Detailed Instruction Description
CoMACMRus
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move
CoMACMRus
Multiply/Multiply-Accumulate Instructions CoMACMRus op1, op2
op1, op2 WORD ACC 40-bit signed value
(tmp) ((op1)) * ((op2)) (ACC) (tmp) - (ACC) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMRus [IDXi*], [Rwm*] Format 93 Xm B8 rrr0:0qqq Bytes 4
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Detailed Instruction Description
CoMACMsu
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACMsu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACMsu
Destination Operand(s) Operation
(tmp) ((op1)) * ((op2)) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMsu Format 93 Xm 59 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACMsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMsu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMsu
(tmp) ((op1)) * ((op2)) (ACC) (ACC) + (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMsu Format 93 Xm 58 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMsuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMsu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMsu-
(tmp) ((op1)) * ((op2)) (ACC) (ACC) - (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMsuFormat 93 Xm 68 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMu
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACMu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACMu
Destination Operand(s) Operation
(tmp) ((op1))*((op2)) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, it is added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMu Format 93 Xm 19 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACMu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMu
(tmp) ((op1))*((op2)) (ACC) (ACC) + (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, it is added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMu Format 93 Xm 18 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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CoMACMuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMu-
(tmp) ((op1))*((op2)) (ACC) (ACC) - (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, it is subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMuFormat 93 Xm 28 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMus
Group Syntax
Source Operand(s)
Multiply-Accumulate & Move & Round Multiply/Multiply-Accumulate Instructions CoMACMus op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACMus
Destination Operand(s) Operation
(tmp) ((op1)) * ((op2)) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACMus Format 93 Xm 99 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*] , rnd
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Detailed Instruction Description
CoMACMus
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMus op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMus
(tmp) ((op1)) * ((op2)) (ACC) (ACC) + (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMus Format 93 Xm 98 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACMusGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Move Multiply/Multiply-Accumulate Instructions CoMACMus- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACMus-
(tmp) ((op1)) * ((op2)) (ACC) (ACC) - (tmp) ((IDXi(-*))) ((IDXi)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. In parallel to the arithmetic operation and to the two parallel reads, the data pointed to by IDXi overwrites another data located in memory (DPRAM). The address of the overwritten data depends on the operation executed on IDXi. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise. Encoding Mnemonic CoMACMusFormat 93 Xm A8 rrr0:0qqq Bytes 4
[IDXi*], [Rwm*]
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Detailed Instruction Description
CoMACR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACR op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACR
IF (MP = 1) THEN (tmp) ((op1) * (op2)) <<1 (ACC) (tmp) - (ACC) + 00 0000 8000h ELSE (tmp) (op1) * (op2) (ACC) (tmp) - (ACC) + 00 0000 8000h END IF (MAL) 0 Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; then, the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACR CoMACR CoMACR Format A3 nm F1 rrr0:0000 83 nm F1 rrr0:0qqq 93 Xm F1 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMACR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACR op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACR
IF (MP = 1) THEN (tmp) ((op1) * (op2)) <<1 (ACC) (tmp) - (ACC) ELSE (tmp) (op1) * (op2) (ACC) (tmp) - (ACC) END IF Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; then, the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACR CoMACR CoMACR Format A3 nm F0 rrr0:0000 83 nm F0 rrr0:0qqq 93 Xm F0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACRsu
Group Syntax
Source Operand(s)
Mixed Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACRsu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACRsu
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACRsu CoMACRsu CoMACRsu Format A3 nm 71 rrr0:0000 83 nm 71 rrr0:0qqq 93 Xm 71 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMACRsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACRsu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACRsu
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN *
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACRsu CoMACRsu CoMACRsu Format A3 nm 70 rrr0:0000 83 nm 70 rrr0:0qqq 93 Xm 70 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACRu
Group Syntax
Source Operand(s)
Unsigned Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACRu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACRu
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended and then the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACRu CoMACRu CoMACRu Format A3 nm 31 rrr0:0000 83 nm 31 rrr0:0qqq 93 Xm 31 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMACRu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACRu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACRu
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended and then the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACRu CoMACRu CoMACRu Format A3 nm 30 rrr0:0000 83 nm 30 rrr0:0qqq 93 Xm 30 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACRus
Group Syntax
Source Operand(s)
Mixed Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACRus op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACRus
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then the 40-bit ACC register contents are subtracted from the result. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMACRus CoMACRus CoMACRus Format A3 nm B1 rrr0:0000 83 nm B1 rrr0:0qqq 93 Xm B1 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMACRus
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACRus op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACRus
(tmp) (op1) * (op2) (ACC) (tmp) - (ACC) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then the 40-bit ACC register contents are subtracted from the result before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACRus CoMACRus CoMACRus Format A3 nm B0 rrr0:0000 83 nm B0 rrr0:0qqq 93 Xm B0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACsu
Group Syntax
Source Operand(s)
Mixed Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACsu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACsu
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACsu CoMACsu CoMACsu Format A3 nm 51 rrr0:0000 83 nm 51 rrr0:0qqq 93 Xm 51 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMACsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACsu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACsu
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACsu CoMACsu CoMACsu Format A3 nm 50 rrr0:0000 83 nm 50 rrr0:0qqq 93 Xm 50 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMACsuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACsu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACsu-
(tmp) (op1) * (op2) (ACC) (ACC) - (tmp) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACsuCoMACsuCoMACsuFormat A3 nm 60 rrr0:0000 83 nm 60 rrr0:0qqq 93 Xm 60 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMACu
Group Syntax
Source Operand(s)
Unsigned Multiply-Accumulate & Round Multiply/Multiply-Accumulate Instructions CoMACu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACu
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended and then added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACu CoMACu CoMACu Format A3 nm 11 rrr0:0000 83 nm 11 rrr0:0qqq 93 Xm 11 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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CoMACu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACu
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended and then added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACu CoMACu CoMACu Format A3 nm 10 rrr0:0000 83 nm 10 rrr0:0qqq 93 Xm 10 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMACuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACu-
(tmp) (op1) * (op2) (ACC) (ACC) - (tmp) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended and then subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACuCoMACuCoMACuFormat A3 nm 20 rrr0:0000 83 nm 20 rrr0:0qqq 93 Xm 20 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMACus
Group Syntax
Source Operand(s)
Mixed Multiply-Accumulate with Round Multiply/Multiply-Accumulate Instructions CoMACus op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMACus
Destination Operand(s) Operation
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then added to the 40-bit ACC register contents. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACus CoMACus CoMACus Format A3 nm 91 rrr0:0000 83 nm 91 rrr0:0qqq 93 Xm 91 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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CoMACus
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACus op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACus
(tmp) (op1) * (op2) (ACC) (ACC) + (tmp) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then added to the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACus CoMACus CoMACus Format A3 nm 90 rrr0:0000 83 nm 90 rrr0:0qqq 93 Xm 90 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMACusGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply-Accumulate Multiply/Multiply-Accumulate Instructions CoMACus- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMACus-
(tmp) (op1) * (op2) (ACC) (ACC) - (tmp) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended and then subtracted from the 40-bit ACC register contents before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMACusCoMACusCoMACusFormat A3 nm A0 rrr0:0000 83 nm A0 rrr0:0qqq 93 Xm A0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMAX
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Maximum Compare Instructions CoMAX op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMAX
(tmp) (op2) || (op1) (ACC) max((ACC),(tmp)) Description Compares a signed 40-bit operand against the 40-bit ACC register contents. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW) which is then sign-extended. If the contents of the 40-bit ACC register are smaller than the 40-bit operand, then the ACC register is loaded with it. Otherwise, the ACC register remains unchanged. The MS bit of the MCW register does not affect the result. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMAX CoMAX CoMAX Format A3 nm 3A rrr0:0000 83 nm 3A rrr0:0qqq 93 Xm 3A rrr0:0qqq Bytes 4 4 4 MSL * ME * MSV MC 0 MZ * MN * Sat. no
Always cleared. Set if the contents of ACC is changed. Not affected otherwise. Set if the MAE is used. Cleared otherwise. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMIN
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) min((ACC),(tmp))
Minimum Compare Instructions CoMIN op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMIN
Description Compares a signed 40-bit operand against the 40-bit ACC register contents. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). If the contents of the ACC register are greater than the 40-bit operand, then the ACC register is loaded with it. Otherwise, the ACC register remains unchanged. The MS bit of the MCW register does not affect the result. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMIN CoMIN CoMIN Format A3 nm 7A rrr0:0000 83 nm 7A rrr0:0qqq 93 Xm 7A rrr0:0qqq Bytes 4 4 4 MSL * ME * MSV MC 0 MZ * MN * Sat. no
Always cleared. Set if the contents of ACC is changed. Not affected otherwise. Set if the MAE is used. Cleared otherwise. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMOV
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Memory to Memory Move Data Movement Instructions CoMOV op1, op2
op2 WORD op1 WORD
CoMOV
Description Moves the contents of the memory location specified by the source operand op2 to the memory location specified by the destination operand op1. Note that in this case, unlike for the other instructions, IDXi can address the entire memory. This instruction does not affect the Mac Flags, but modifies the CPU Flags as any other MOV instruction. Note: CoMOV is the only MAC instruction which affects the CPU flags. MAC Flags are not affected. CPU Flags E * E Z V C N Z * V C N *
Set if the value of op2 represents the lowest possible negative number. Cleared otherwise. Used to signal the end of a table. Set if the value of the source operand op2 equals zero. Cleared otherwise. Not affected. Not affected. Set if the most significant bit of the source operand op2 is set. Cleared otherwise.
Encoding Mnemonic CoMOV Format D3 Xm 00 rrr0:0qqq Bytes 4
[IDXi*] , [Rwm*]
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CoMUL
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Signed Multiply with Round Multiply/Multiply-Accumulate Instructions CoMUL op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMUL
IF (MP = 1) THEN (ACC) ((op1) * (op2)) <<1 + 00 0000 8000h ELSE (ACC) (op1) * (op2) + 00 0000 8000h END IF (MAL) 0 Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted. Finally, the result is 2s complement rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN * Sat. yes
Always cleared. Not affected when MP or MS are cleared, otherwise, only set in case of 8000h by 8000h multiplication. ME Set when MP is set and MS is cleared and in case of 8000h by 8000h multiplication. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMUL CoMUL CoMUL Format A3 nm C1 rrr0:0000 83 nm C1 rrr0:0qqq 93 Xm C1 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMUL
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Signed Multiply Multiply/Multiply-Accumulate Instructions CoMUL op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMUL
IF (MP = 1) THEN (ACC) ((op1) * (op2)) <<1 ELSE (ACC) (op1) * (op2) END IF Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN * Sat. yes
Always cleared. Not affected when MP or MS are cleared, otherwise, only set in case of 8000h by 8000h multiplication. ME Set when MP is set and MS is cleared and in case of 8000h by 8000h multiplication. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoMUL CoMUL CoMUL Format A3 nm C0 rrr0:0000 83 nm C0 rrr0:0qqq 93 Xm C0 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Signed Multiply Multiply/Multiply-Accumulate Instructions CoMUL- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMUL-
IF (MP = 1) THEN (ACC) - ((op1) * (op2)) <<1 ELSE (ACC) - ((op1) * (op2)) END IF Description Multiplies the two signed 16-bit source operands op1 and op2. The resulting signed 32-bit product is first sign-extended; then, if the MP flag is set, it is one-bit left shifted; and, finally, it is negated before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULCoMULCoMULFormat A3 nm C8 rrr0:0000 83 nm C8 rrr0:0qqq 93 Xm C8 rrr0:0qqq Bytes 4 4 4 MSL 0 ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Always cleared. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply & Round Multiply/Multiply-Accumulate Instructions CoMULsu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMULsu
(ACC) (op1) * (op2) + 00 0000 8000h (MAL) 0 Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULsu CoMULsu CoMULsu Format A3 nm 41 rrr0:0000 83 nm 41 rrr0:0qqq 93 Xm 41 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMULsu
Group Syntax
Source Operand(s) Destination Operand(s) Operation (ACC) (op1) * (op2)
Mixed Multiply Multiply/Multiply-Accumulate Instructions CoMULsu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULsu
Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULsu CoMULsu CoMULsu Format A3 nm 40 rrr0:0000 83 nm 40 rrr0:0qqq 93 Xm 40 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULsuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply Multiply/Multiply-Accumulate Instructions CoMULsu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULsu-
(ACC) - ((op1) * (op2)) Description Multiplies the two signed and unsigned 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, is negated before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULsuCoMULsuCoMULsuFormat A3 nm 48 rrr0:0000 83 nm 48 rrr0:0qqq 93 Xm 48 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULu
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiply with Round Multiply/Multiply-Accumulate Instructions CoMULu op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMULu
(ACC) (op1) * (op2) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, it is rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN 0 Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Always cleared.
Encoding Mnemonic CoMULu CoMULu CoMULu Format A3 nm 01 rrr0:0000 83 nm 01 rrr0:0qqq 93 Xm 01 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMULu
Group Syntax
Source Operand(s) Destination Operand(s) Operation (ACC) (op1) * (op2)
Unsigned Multiply Multiply/Multiply-Accumulate Instructions CoMULu op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULu
Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is zero-extended before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN 0 Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Always cleared.
Encoding Mnemonic CoMULu CoMULu CoMULu Format A3 nm 00 rrr0:0000 83 nm 00 rrr0:0qqq 93 Xm 00 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULuGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Unsigned Multiply Multiply/Multiply-Accumulate Instructions CoMULu- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULu-
(ACC) - ((op1) * (op2)) Description Multiplies the two unsigned 16-bit source operands op1 and op2. The resulting unsigned 32-bit product is first zero-extended; then, it is negated before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL MSL * ME * MSV MC 0 MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Always cleared. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoMULuCoMULuCoMULuFormat A3 nm 08 rrr0:0000 83 nm 08 rrr0:0qqq 93 Xm 08 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoMULus
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply with Round Multiply/Multiply-Accumulate Instructions CoMULus op1, op2, rnd
op1, op2 WORD ACC 40-bit signed value
CoMULus
(ACC) (op1) * (op2) + 00 0000 8000h (MAL) 0 Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULus CoMULus CoMULus Format A3 nm 81 rrr0:0000 83 nm 81 rrr0:0qqq 93 Xm 81 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm , rnd Rwn , [Rwm*] , rnd [IDXi*] , [Rwm*] , rnd
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Detailed Instruction Description
CoMULus
Group Syntax
Source Operand(s) Destination Operand(s) Operation (ACC) (op1) * (op2)
Mixed Multiply Multiply/Multiply-Accumulate Instructions CoMULus op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULus
Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULus CoMULus CoMULus Format A3 nm 80 rrr0:0000 83 nm 80 rrr0:0qqq 93 Xm 80 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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CoMULusGroup Syntax
Source Operand(s) Destination Operand(s) Operation
Mixed Multiply Multiply/Multiply-Accumulate Instructions CoMULus- op1, op2
op1, op2 WORD ACC 40-bit signed value
CoMULus-
(ACC) - ((op1) * (op2)) Description Multiplies the two unsigned and signed 16-bit source operands op1 and op2, respectively. The resulting signed 32-bit product is first sign-extended; then, it is negated before being stored in the 40-bit ACC register. MAC Flags MV 0 MV MSL ME MSV MC MZ MN Encoding Mnemonic CoMULusCoMULusCoMULusFormat A3 nm 88 rrr0:0000 83 nm 88 rrr0:0qqq 93 Xm 88 rrr0:0qqq Bytes 4 4 4 MSL ME 0 MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Always cleared. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoNEG
Group Syntax
Source Operand(s) Destination Operand(s) Operation (ACC) 0 - (ACC)
Negate Accumulator Arithmetic Instructions CoNEG
ACC 40-bit signed value ACC 40-bit signed value
CoNEG
Description The ACC register contents are subtracted from zero before being stored in the 40-bit ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoNEG Format A3 00 32 rrr0:0000 Bytes 4
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CoNEG
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Negate Accumulator with Round Arithmetic Instructions CoNEG rnd
ACC 40-bit signed value ACC 40-bit signed value
CoNEG
(ACC) 0 - (ACC) + 00 0000 8000h (MAL) 0 Description The ACC register contents are subtracted from zero and the result is rounded before being stored in the 40-bit ACC register. The MAL register is cleared. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoNEG Format A3 00 72 rrr0:0000 Bytes 4
rnd
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Detailed Instruction Description
CoNOP
Group Syntax
Source Operand(s) Destination Operand(s) Operation No Operation Description Modifies the address pointers. MAC Flags MV MV MSL ME MSV MC MZ MN Encoding Mnemonic CoNOP CoNOP CoNOP MSL ME -
No-Operation Arithmetic Instructions CoNOP
none none
CoNOP
MSV -
MC -
MZ -
MN -
Sat. no
Not affected. Not affected. Not affected. Not affected. Not affected. Not affected. Not affected.
[IDXi*] , [Rwm*] [IDXi*] [Rwm*]
Format 93 Xm 5A rrr0:0qqq 93 X0 5A rrr0:0001 93 1m 5A rrr0:0qqq
Bytes 4 4 4
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Detailed Instruction Description
CoRND
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Round Accumulator Shift Instructions CoRND
ACC 40-bit signed value ACC 40-bit signed value signed value
CoRND
(ACC) (ACC) + 00 0000 8000h (MAL) 0 Description Rounds the ACC register contents by adding 00 0000 8000h and stores the result in the ACC register and the lower part of the ACC register. MAL, is cleared. Note: CoRND is a shortname for CoASHR #0, rnd MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic overflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic overflow occurred. Not affected otherwise. MC Set if a carry is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoRND Format A3 00 B2 rrr0:0000 Bytes 4
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Detailed Instruction Description
CoSHL
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Accumulator Logical Shift Left Shift Instructions CoSHL op1
op1 5-bit unsigned data ACC 40-bit signed value
CoSHL
(count) (op1) (C) <- (ACC[39]) DO WHILE ((count) 0) (C) (ACC[39]) (ACC[n]) (ACC[n-1]) [n=39...1] (ACC[0]) 0 (count) (count) -1 END WHILE Description Shifts the 40-bit ACC register contents left by the number of times specified by the operand op1. The least significant bits of the result are filled with zeros accordingly. Only shift values from 0 to 16 (inclusive) are allowed. op1 can be either a 5-bit unsigned immediate data (the shift range is from 0 to 16 in this case) or the four least significant bits (the shift range is from 0 to 15 in that case) of any register directly or indirectly addressed operand. Note: For this instruction only, the saturation is computed using the 40-bit result. So a sign shifted over the 40 bit result is disregarded. MAC Flags MV 0 MV MSL MSL * ME * MSV MC * MZ * MN * Sat. yes
Always cleared. Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Not affected. MC Carry flag is set according to the last most significant bit shifted out of ACC or according to the sign of ACC. MZ Set if result equals zero. Cleared otherwise.
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Detailed Instruction Description MN Encoding Mnemonic CoSHL CoSHL CoSHL Format A3 00 82 rrr#:# A3 nn 8A rrr0:0000 83 mm 8A rrr0:0qqq Bytes 4 4 4 Set if the most significant bit of the result is set. Cleared otherwise.
#data5 Rwn [Rwm*]
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CoSHR
Group Syntax
Source Operand(s) Destination Operand(s) Operation
Accumulator Logical Shift Right Shift Instructions CoSHR op1
op1 5-bit unsigned data ACC 40-bit signed value
CoSHR
(count) (op1) (C) 0 DO WHILE (count) 0 ((ACC[n]) (ACC[n+1]) [n=0...38] (ACC[39]) 0 (count) (count) -1 END WHILE Description Shifts the 40-bit ACC register contents right the number of times as specified by the operand op1. The most significant bits of the result are filled with zeros accordingly. Only shift values from 0 to 16 (inclusive) are allowed. op1 can be either a 5-bit unsigned immediate data (the shift range is from 0 to 16 in this case) or the four least significant bits (the shift range is from 0 to 15 in that case) of any register directly or indirectly addressed operand. The MS bit of the MCW register does not affect the result. MAC Flags MV 0 MV MSL ME MSV MC MZ MN MSL ME * MSV MC 0 MZ * MN * Sat. no
Always cleared. Not affected. Set if the MAE is used. Cleared otherwise. Not affected. Always cleared. Set if result equals zero. Cleared otherwise. Set if the most significant bit of the result is set. Cleared otherwise.
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Detailed Instruction Description Encoding Mnemonic CoSHR CoSHR CoSHR Format A3 00 92 rrr#:# A3 nn 9A rrr0:0000 83 mm 9A rrr0:0qqq Bytes 4 4 4
#data5 Rwn [Rwm*]
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CoSTORE
Group Syntax
Source Operand(s) Destination Operand(s) Operation (op1) (op2)
Store a MAC-Unit Register Data Movement Instructions CoSTORE op1, op2
op2 WORD op1 WORD
CoSTORE
Description Moves the contents of a MAC-Unit register specified by the source operand op2 to the location specified by the destination operand op1. MAC Flags MV MV MSL ME MSV MC MZ MN Encoding Mnemonic CoSTORE CoSTORE Format C3 nn wwww:w000 rrr0:0000 B3 nn wwww:w000 rrr0:0qqq Bytes 4 4 MSL ME MSV MC MZ MN Sat. no
Not affected. Not affected. Not affected. Not affected. Not affected. Not affected. Not affected.
Rwn , CoReg [Rwn*] , CoReg
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Detailed Instruction Description
CoSUB
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) (ACC) - (tmp)
Subtract Arithmetic Instructions CoSUB op1, op2
op1, op2 WORD ACC 40-bit signed value
CoSUB
Description Subtracts a 40-bit operand from the 40-bit ACC contents and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoSUB CoSUB CoSUB Format A3 nm 0A rrr0:0000 83 nm 0A rrr0:0qqq 93 Xm 0A rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoSUB2
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) 2 * (op2) || (op1) (ACC) (ACC) - (tmp)
Subtract Arithmetic Instructions CoSUB2 op1, op2
op1, op2 WORD ACC 40-bit signed value
CoSUB2
Description Subtracts a 40-bit operand from the 40-bit ACC contents and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is then multiplied by two before being subtracted from the ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoSUB2 CoSUB2 CoSUB2 Format A3 nm 4A rrr0:0000 83 nm 4A rrr0:0qqq 93 Xm 4A rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoSUB2R
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) 2 * (op2) || (op1) (ACC) (tmp) - (ACC)
Subtract Arithmetic Instructions CoSUB2R op1, op2
op1, op2 WORD ACC 40-bit signed value
CoSUB2R
Description Subtracts the 40-bit ACC contents from a 40-bit operand and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). The 40-bit operand is then multiplied by two before being subtracted from the ACC register. MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoSUB2R CoSUB2R CoSUB2R Format A3 nm 52 rrr0:0000 83 nm 52 rrr0:0qqq 93 Xm 52 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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Detailed Instruction Description
CoSUBR
Group Syntax
Source Operand(s) Destination Operand(s) Operation (tmp) (op2) || (op1) (ACC) (tmp) - (ACC)
Subtract Arithmetic Instructions CoSUBR op1, op2
op1, op2 WORD ACC 40-bit signed value
CoSUBR
Description Subtracts the 40-bit ACC contents from a 40-bit operand and stores the result in the ACC register. The 40-bit operand is a sign-extended result of the concatenation of the two source operands op1 (LSW) and op2 (MSW). MAC Flags MV * MV MSL * ME * MSV * MC * MZ * MN * Sat. yes
Set if an arithmetic underflow occurred, i.e. the result cannot be represented in the 40-bit data type. Cleared otherwise. MSL Set if the contents of ACC is automatically saturated. Not affected otherwise. ME Set if the MAE is used. Cleared otherwise. MSV Set if an arithmetic underflow occurred. Not affected otherwise. MC Set if a borrow is generated. Cleared otherwise. MZ Set if result equals zero. Cleared otherwise. MN Set if the most significant bit of the result is set. Cleared otherwise.
Encoding Mnemonic CoSUBR CoSUBR CoSUBR Format A3 nm 12 rrr0:0000 83 nm 12 rrr0:0qqq 93 Xm 12 rrr0:0qqq Bytes 4 4 4
Rwn , Rwm Rwn , [Rwm*] [IDXi*] , [Rwm*]
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8.3
Instructions for OCDS/ITC injection and System Control
The following table gives a brief overview of the instructions that are defined especially for injections via the Interrupt and PEC controller and for debugging reasons by the OCDS. All instruction are 32 bit wide and overlap the existing instruction set. All these instructuions are not modifying the PSW except direct writes to the PSW and the ITRAP/ ITRAPS instruction that adjust the level inside the PSW. All these instructions are only available for injection. operand mem24 symbol MM2 MM0 MM1 size 24 comment direct 24 bit address for memory access. The format MM2 MM0 MM1 means that the 24 bit address (byte2,byte1,byte0) has to be presented in the order byte2, byte0, byte1. direct 23bit (to be LSB extended by zero) for program access. selection of local/global banks 00 10 11 01 #data23 Rx Rbx Table 8-1 dd dd d:ddd x 23 4 global register bank local register bank 1 local register bank 2 reserved
#addr23 #banksel2
aa aa a:aaa ss
23 2
direct 23bit (to be LSB extended by zero) data to be written to CSP/IP. word GPR address byte GPR address
x 4 Used shortcuts
Mnemonic OLOAD
Operands mem24
Opcode 0D MM2 MM0 MM1
Cycle 1
Comment reads word from memory and writes to OCDS reads word from OCDS and writes to memory
OSTORE
mem24
1D MM2 MM0 MM1
1
Table 8-2
Instructions for Injection only
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Detailed Instruction Description Mnemonic OLOADB Operands mem24 Opcode 2D MM2 MM0 MM1 Cycle 1 Comment reads byte from memory and writes to OCDS reads byte from OCDS and writes to memory reads word from GPR and writes to OCDS reads word from OCDS and writes to GPR reads byte from GPR and writes to OCDS reads byte from OCDS and writes to GPR writes CSP/IP register to force a program brnach reads the current instruction pointer and writes it to OCDS Interrupt Trap with absolut address Short Interrupt Trap with10 bit trap number using VECSEG
OSTOREB
mem24
3D MM2 MM0 MM1
1
OLOAD
Rx, #banksel2
4D ss00:x 00 00
1
OSTORE
Rx, #banksel2
5D ss00:x 00 00
1
OLOADB
Rbx, #banksel2
6D ss00:x 00 00
1
OSTOREB
Rbx, #banksel2
7D ss00:x 00 00
1
MOVCSIP
#data23
9D dd dd d:ddd0
1
OLOADIP
8D 00 00 00
1
ITRAP
#addr23, #banksel2 #trap10, #banksel2
10ss:B aa aa a:aaa0
4
ITRAPS
11ss:B 00 0t t:tt00"
4
Table 8-2
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Instructions for Injection only
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Detailed Instruction Description Mnemonic PEC1) Operands mem24 Opcode CD MM2 MM0 MM1 Cycle 1 Comment word PEC transfer started by ITC word PEC transfer started by OCDS byte PEC transfer started by ITC byte PEC transfer started by OCDS reads memory and writes result to trace bus reads GPR and writes result to trace bus injected NOP (reserved for later use)
DPEC1)
mem24
DD MM2 MM0 MM1
1
PECB1)
mem24
AD MM2 MM0 MM1
1
DPECB1)
mem24
BD MM2 MM0 MM1
1
TLOAD
mem24
8A MM2 MM0 MM1
1
TLOAD
Rx, #banksel2
CA ss00:x 00 00
1
INOP
9A 00 00 00 AA 00 00 00 BA 00 00 00 DA 00 00 00 EA 00 00 00 FA 00 00 00 ED 00 00 00
1
CXLOAD
11
internal instruction used for switch context internal instruction used for switch context
CXSW
FD 00 00 00
19
Table 8-2
1)
Instructions for Injection only
The shown operand specifies the source address for the PEC operation. For the destination address a dedicated CPU input is provided.
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Summary of CPU/Subsystem Registers
9
Summary of CPU/Subsystem Registers
This chapter summarizes all registers implemented in the C166S V2 CPU. There are two register types: the General Purpose Registers (GPR) and the CPU-Special Function Registers (CSFR). GPRs are the working registers of the arithmetic and logic operations and may be also used as address pointers indirect addressing modes. CSFRs are the control registers of the C166S V2 CPU. The register set for the PEC and Interrupt Controller is listed. For easy reference, the SFRs are ordered in two different ways: * Sorted by the address, to identify a register at a given address. * Sorted by the register name, to find an address of a specific register.
9.1
General Purpose Registers (GPRs)
The General Purpose Registers (GPRs) are the working registers of the C166S V2 CPU. All GPRs are bit addressable. Table 9-1 Addressing Modes to Access Word-GPRs Reset Value UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH UUUUH
4-Bit Description Name Physical 8-Bit Address Address Address
1)
R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15
1)
(CP)+0 (CP)+2 (CP)+4 (CP)+6 (CP)+8
F0H F1H F2H F3H F4H
0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh Ch Dh Eh Fh
General Purpose Word Register R0 General Purpose Word Register R1 General Purpose Word Register R2 General Purpose Word Register R3 General Purpose Word Register R4 General Purpose Word Register R5 General Purpose Word Register R6 General Purpose Word Register R7 General Purpose Word Register R8 General Purpose Word Register R9
(CP)+10 F5H (CP)+12 F6H (CP)+14 F7H (CP)+16 F8H (CP)+18 F9H (CP)+20 FAH (CP)+22 FBH (CP)+24 FCH (CP)+26 FDH (CP)+28 FEH (CP)+30 FFH
General Purpose Word Register R10 UUUUH General Purpose Word Register R11 UUUUH General Purpose Word Register R12 UUUUH General Purpose Word Register R13 UUUUH General Purpose Word Register R14 UUUUH General Purpose Word Register R15 UUUUH
Addressing mode only usable if the GPR bank is memory mapped.
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Summary of CPU/Subsystem Registers The first 8 GPRs (R7...R0) may be also accessed bytewise. Unlike SFRs, writing to a GPR byte does not affect another byte of the GPR. The following byte-accessible registers have special names. Table 9-2 Addressing Modes to Access Byte-GPRs Reset Value UUH UUH UUH UUH UUH UUH UUH UUH UUH UUH
4-Bit Description Name Physical 8-Bit Address Address Address
1)
RL0 RH0 RL1 RH1 RL2 RH2 RL3 RH3 RL4 RH4 RL5 RH5 RL6 RH6 RL7 RH7
1)
(CP)+0 (CP)+1 (CP)+2 (CP)+3 (CP)+4 (CP)+5 (CP)+6 (CP)+7 (CP)+8 (CP)+9
F0H F1H F2H F3H F4H F5H F6H F7H F8H F9H
0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh Ch Dh Eh Fh
General Purpose Byte Register RL0 General Purpose Byte Register RL1 General Purpose Byte Register RL2 General Purpose Byte Register RL3 General Purpose Byte Register RL4 General Purpose Byte Register RL5 General Purpose Byte Register RL6 General Purpose Byte Register RL7 General Purpose Byte Register RL8 General Purpose Byte Register RL9
(CP)+10 FAH (CP)+11 FBH (CP)+12 FCH (CP)+13 FDH (CP)+14 FEH (CP)+15 FFH
General Purpose Byte Register RL10 UUH General Purpose Byte Register RL11 UUH General Purpose Byte Register RL12 UUH General Purpose Byte Register RL13 UUH General Purpose Byte Register RL14 UUH General Purpose Byte Register RL15 UUH
Addressing mode only usable if the GPR bank is memory mapped.
The 8-bit short addresses F0H...FEH within the ESFR area are reserved and provide access to the current register bank via short register addressing modes. The GPRs are mirrored to the ESFR area which allows access to the current register bank even after switching register spaces (see example below).
MOV EXTR MOV R5, DP3 ;GPR access via SFR area #1 R5, ODP3 ;GPR access via ESFR area
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9.2 9.2.1
Core Special Function Registers Ordered by Name
Table 9-3 lists all CSFRs implemented in the C166S V2 CPU, in alphabetical order. Bit addressable CSFRs are marked with the letter "b" in the "Name" column. CSFRs within the Extended CSFR-Space (ECSFRs) are marked with the letter "E" in the "8-Bit Address" column. Table 9-3 Name CP CPUCON1 CPUCON2 CPUID CSP DPP0 DPP1 DPP2 DPP3 IDX0 IDX1 MAL MAH MCW MDC MDH MDL MRW MSW ONES PSW QX0 Addressing Modes to Access Core-SFRs: Ordered by Name Physical 8-Bit Address Address FE10H FE18H FE1AH F00CH FE08H FE00H FE02H FE04H FE06H b FF08H b FF0AH FE5CH FE5EH b FFDCH b FF0EH FE0CH FE0EH b FFDAH b FFDEH b FF1EH b FF10H F000H 08H 0CH 0DH E-06H 04H 00H 01H 02H 03H 84H 85H 2EH 2FH EEH 87H 06H 07H EDH EFH 8FH 88H E-00H Description Context Pointer Core Control Register Core Control Register CPU Identification Register Code Segment Pointer (8 bits, not directly writable) Data Page Pointer 0 (10 bits) Data Page Pointer 1 (10 bits) Data Page Pointer 2 (10 bits) Data Page Pointer 3 (10 bits) MAC Address Pointer 0 MAC Address Pointer 1 MAC Accumulator - Low Word MAC Accumulator - High Word MAC Control Word Multiply Divide Control Register Multiply Divide Register - High Word Multiply Divide Register - Low Word MAC Repeat Word MAC Status Word Constant Value 1's Register (read only) Program Status Word MAC Offset Register X0 Reset Value FC00H 0000H 0000H 03??H1) 0000H 0000H 0001H 0002H 0003H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0200H FFFFH 0000H 0000H
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Summary of CPU/Subsystem Registers Table 9-3 Name QX1 QR0 QR1 SP STKOV STKUN TFR Addressing Modes to Access Core-SFRs: Ordered by Name (cont'd) Physical 8-Bit Address Address F002H F004H F006H FE12H FE14H FE16H b FFACH E-01H E-02H E-03H 09H 86H 0AH 0BH D6H 89H 8EH Description MAC Offset Register X1 MAC Offset Register R0 MAC Offset Register R1 Stack Pointer Stack Pointer Segment Register Stack Overflow Register Stack Underflow Register Trap Flag Register Vector Table Segment Register Constant Value 0's Register (read only) Reset Value 0000H 0000H 0000H FC00H 0000H FA00H FC00H 0000H ????H2) 0000H
SPSEG b FF0CH
VECSEG b FF12H ZEROS b FF1CH
1) 2)
`??': defined by reset configuration `????': defined by reset configuration
9.2.2
Ordered by Address
Table 9-4 lists all CSFRs implemented in the C166S V2 ordered by physical address. Bit addressable CSFRs are marked with the letter "b" in the "Name" column. CSFRs within the Extended SFR-Space (ESFRs) are marked with the letter "E" in the "8-Bit Address" column. Table 9-4 Name QX0 QX1 QR0 QR1 CPUID DPP0 DPP1 DPP2 DPP3 Addressing Modes to Access Core-SFRs: Ordered by Address Physical 8-Bit Description Address Address F000H F002H F004H F006H F00CH FE00H FE02H FE04H FE06H E-00H E-01H E-02H E-03H E-06H 00H 01H 02H 03H MAC Offset Register X0 MAC Offset Register X1 MAC Offset Register R0 MAC Offset Register R1 CPU Identification Register Data Page Pointer 0 (10 bits) Data Page Pointer 1 (10 bits) Data Page Pointer 2 (10 bits) Data Page Pointer 3 (10 bits) Reset Value 0000H 0000H 0000H 0000H 03??H1) 0000H 0001H 0002H 0003H
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Summary of CPU/Subsystem Registers Table 9-4 Name CSP MDH MDL CP SP STKOV STKUN CPUCON1 CPUCON2 MAL MAH IDX0 IDX1 MDC PSW Addressing Modes to Access Core-SFRs: Ordered by Address Physical 8-Bit Description Address Address FE08H FE0CH FE0EH FE10H FE12H FE14H FE16H FE18H FE1AH FE5CH FE5EH b FF08H b FF0AH b FF0EH b FF10H 04H 06H 07H 08H 09H 0AH 0BH 0CH 0DH 2EH 2FH 84H 85H 86H 87H 88H 89H 8EH 8FH D6H EDH EEH EFH Code Segment Pointer (8 bits, not directly writable) Multiply Divide Register - High Word Multiply Divide Register - Low Word Context Pointer Stack Pointer Stack Overflow Register Stack Underflow Register Core Control Register Core Control Register MAC Accumulator - Low Word MAC Accumulator - High Word MAC Address Pointer 0 MAC Address Pointer 1 Stack Pointer Segment Register Multiply Divide Control Register Program Status Word Vector Table Segment Register Constant Value 0s Register (read only) Constant Value 1s Register (read only) Trap Flag Register MAC Repeat Word MAC Control Word MAC Status Word Reset Value 0000H 0000H 0000H FC00H FC00H FA00H FC00H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H ????H2) 0000H FFFFH 0000H 0000H 0000H 0200H
SPSEG b FF0CH
VECSEG b FF12H ZEROS b FF1CH ONES TFR MRW MCW MSW
1) 2)
b FF1EH b FFACH b FFDAH b FFDCH b FFDEH
`??': defined by reset configuration `????': defined by reset configuration
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9.3 9.3.1
Register Overview Interrupt and Peripheral Event Controller Ordered by Name
Table 9-5 lists all xSFRs that are implemented in the C166S V2 Interrupt and Peripheral Event Controller, ordered by name. Bit addressable SFRs are marked with the letter "b" in the "Name" column. SFRs within the Extended SFR-Space (ESFRs) are marked with the letter "E" in the "8-Bit Address" column. Table 9-5 Register Overview Interrupt and PEC: Ordered by Name Name BNKSEL0 BNKSEL1 BNKSEL2 BNKSEL3 DSTP0 DSTP1 DSTP2 DSTP3 DSTP4 DSTP5 DSTP6 DSTP7 EOPIC1) FINT0ADDR FINT0CSP FINT1ADDR FINT1CSP IRQxIC
1)
Physical Address EC20H EC22H EC24H EC26H EC42H EC46H EC4AH EC4EH EC52H EC56H EC5AH EC5EH b F180H EC02H EC00H EC06H EC04H xxxxH FEC0H FEC2H FEC4H FEC6H FEC8H
8-bit Description Address ------------E-C0H ----xxH 60H 61H 62H 63H 64H Bank Selection Register 0 Bank Selection Register 1 Bank Selection Register 2 Bank Selection Register 3 PEC Channel 0 Destination Pointer PEC Channel 1 Destination Pointer PEC Channel 2 Destination Pointer PEC Channel 3 Destination Pointer PEC Channel 4 Destination Pointer PEC Channel 5 Destination Pointer PEC Channel 6 Destination Pointer PEC Channel 7 Destination Pointer End of PEC Interrupt Control Reg. Fast Interrupt 0 Address Register Fast Interrupt 0 CSP Register Fast Interrupt 1 Address Register Fast Interrupt 1 CSP Register Interrupt x Control Register PEC Channel 0 Control Register PEC Channel 1 Control Register PEC Channel 2 Control Register PEC Channel 3 Control Register PEC Channel 4 Control Register
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Reset Value 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H
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Summary of CPU/Subsystem Registers Table 9-5 Name PECC5 PECC6 PECC7 PECISNC PECSEG0 PECSEG1 PECSEG2 PECSEG3 PECSEG4 PECSEG5 PECSEG6 PECSEG7 SRCP0 SRCP1 SRCP2 SRCP3 SRCP4 SRCP5 SRCP6 SRCP7
1)
Register Overview Interrupt and PEC: Ordered by Name (cont'd) Physical Address FECAH FECCH FECEH b FFA8H EC80H EC82H EC84H EC86H EC88H EC8AH EC8C EC8E EC40 EC44 EC48 EC4C EC50 EC54 EC58 EC5C 8-bit Description Address 65H 66H 67H D4H ----------------PEC Channel 5 Control Register PEC Channel 6 Control Register PEC Channel 7 Control Register PEC Interrupt Subnode Control Reg. Reset Value 0000H 0000H 0000H 0000H
PEC Pointer 0 Segment Address Reg. 0000H PEC Pointer 1 Segment Address Reg. 0000H PEC Pointer 2 Segment Address Reg. 0000H PEC Pointer 3 Segment Address Reg. 0000H PEC Pointer 4 Segment Address Reg. 0000H PEC Pointer 5 Segment Address Reg. 0000H PEC Pointer 6 Segment Address Reg. 0000 PEC Pointer 7 Segment Address Reg. 0000 PEC Channel 0 Source Pointer PEC Channel 1 Source Pointer PEC Channel 2 Source Pointer PEC Channel 3 Source Pointer PEC Channel 4 Source Pointer PEC Channel 5 Source Pointer PEC Channel 6 Source Pointer PEC Channel 7 Source Pointer 0000 0000 0000 0000 0000 0000 0000 0000
The implementation and assignment of these Interrupt Control Registers are product specific.
9.3.2
Ordered by Address
Table 9-6 lists all xSFRs that are implemented in the C166S V2 Interrupt and Peripheral Event Controller ordered by address. Bit addressable SFRs are marked with the letter "b" in the "Name" column. SFRs within the Extended SFR-Space (ESFRs) are marked with the letter "E" in the "8-Bit Address" column.
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Summary of CPU/Subsystem Registers Table 9-6 Name FINT0CSP FINT0ADDR FINT1CSP FINT1ADDR BNKSEL0 BNKSEL1 BNKSEL2 BNKSEL3 SRCP0 DSTP0 SRCP1 DSTP1 SRCP2 DSTP2 SRCP3 DSTP3 SRCP4 DSTP4 SRCP5 DSTP5 SRCP6 DSTP6 SRCP7 DSTP7 PECSEG0 PECSEG1 PECSEG2 PECSEG3 PECSEG4 Register Overview Interrupt and PEC: Ordered by Address Physical Address EC00H EC02H EC04H EC06H EC20H EC22H EC24H EC26H EC40H EC42H EC44H EC46H EC48H EC4AH EC4CH EC4EH EC50H EC52H EC54H EC56H EC58H EC5AH EC5CH EC5EH EC80H EC82H EC84H EC86H EC88H 8-bit Description Address -----------------------------Fast Interrupt 0 CSP Register Fast Interrupt 0 Address Register Fast Interrupt 1 CSP Register Fast Interrupt 1 Address Register Bank Selection Register 0 Bank Selection Register 1 Bank Selection Register 2 Bank Selection Register 3 PEC Channel 0 Source Pointer PEC Channel 0 Destination Pointer PEC Channel 1 Source Pointer PEC Channel 1 Destination Pointer PEC Channel 2 Source Pointer PEC Channel 2 Destination Pointer PEC Channel 3 Source Pointer PEC Channel 3 Destination Pointer PEC Channel 4 Source Pointer PEC Channel 4 Destination Pointer PEC Channel 5 Source Pointer PEC Channel 5 Destination Pointer PEC Channel 6 Source Pointer PEC Channel 6 Destination Pointer PEC Channel 7 Source Pointer PEC Channel 7 Destination Pointer Reset Value 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H
PEC Pointer 0 Segment Address Reg. 0000H PEC Pointer 1 Segment Address Reg. 0000H PEC Pointer 2 Segment Address Reg. 0000H PEC Pointer 3 Segment Address Reg. 0000H PEC Pointer 4 Segment Address Reg. 0000H
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Summary of CPU/Subsystem Registers Table 9-6 Name PECSEG5 PECSEG6 PECSEG7 EOPIC1) PECC0 PECC1 PECC2 PECC3 PECC4 PECC5 PECC6 PECC7 IRQxIC1) PECISNC
1)
Register Overview Interrupt and PEC: Ordered by Address (cont'd) Physical Address EC8AH EC8CH EC8EH b F180H FEC0H FEC2H FEC4H FEC6H FEC8H FECAH FECCH FECEH xxxxH b FFA8H 8-bit Description Address ---E-C0H 60H 61H 62H 63H 64H 65H 66H 67H xxH D0H Reset Value
PEC Pointer 5 Segment Address Reg. 0000H PEC Pointer 6 Segment Address Reg. 0000H PEC Pointer 7 Segment Address Reg. 0000H End of PEC Interrupt Control Reg. PEC Channel 0 Control Register PEC Channel 1 Control Register PEC Channel 2 Control Register PEC Channel 3 Control Register PEC Channel 4 Control Register PEC Channel 5 Control Register PEC Channel 6 Control Register PEC Channel 7 Control Register Interrupt x Control Register PEC Interrupt Subnode Control Reg. 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H
The implementation and assignment of theses Interrupt Control Registers are product specific.
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9.4 9.4.1
Table 9-7 Name
Register Overview External Bus Controller Ordered by Name
Register Overview EBC: Ordered by Name Physical Address EE1EH EE26H EE 2EH EE36H EE 3EH EE46H EE 4EH EE00H EE02H EE12H EE1AH EE22H EE2AH EE32H EE 3AH EE 42H EE4AH EE10H EE18H EE20H EE28H EE 30H EE38H EE40H EE48H EE0CH EE0EH 8-Bit Address ---------------------------Description Address Window Selection for CS1 Address Window Selection for CS2 Address Window Selection for CS3 Address Window Selection for CS4 Address Window Selection for CS5 Address Window Selection for CS6 Address Window Selection for CS7 Alternate Function of EBC Pins Global Behavior of EBC Function Control for CS0 Function Control for CS1 Function Control for CS2 Function Control for CS3 Function Control for CS4 Function Control for CS5 Function Control for CS6 Function Control for CS7 Timing Control for CS0 Timing Control for CS1 Timing Control for CS2 Timing Control for CS3 Timing Control for CS4 Timing Control for CS5 Timing Control for CS6 Timing Control for CS7 Timing Control for Monitor Memory Timing Control for Startup Memory
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Reset Value 0000H 0000H 0000H 0000H 0000H 0000H 0000H 00F0H 0000H 0021H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 6243H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 6243H 6243H
ADDRSEL1 ADDRSEL2 ADDRSEL3 ADDRSEL4 ADDRSEL5 ADDRSEL6 ADDRSEL7 EBCMOD0 EBCMOD1 FCONCS0 FCONCS1 FCONCS2 FCONCS3 FCONCS4 FCONCS5 FCONCS6 FCONCS7 TCONCS0 TCONCS1 TCONCS2 TCONCS3 TCONCS4 TCONCS5 TCONCS6 TCONCS7 TCONCSMM TCONCSSM
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9.4.2
Table 9-8 Name
Ordered by Address
Register Overview EBC: Ordered by Name Physical Address EE00H EE02H EE0CH EE0EH EE10H EE12H EE18H EE1AH EE1EH EE20H EE22H EE26H EE28H EE2AH EE2EH EE30H EE32H EE36H EE38H EE3AH EE3EH EE40H EE42H EE46H EE48H EE4AH EE 4EH 8-Bit Address ---------------------------Description Alternate Function of EBC Pins Global Behavior of EBC Timing Control for Monitor Memory Timing Control for Startup Memory Timing Control for CS0 Function Control for CS0 Timing Control for CS1 Function Control for CS1 Address Window Selection for CS1 Timing Control for CS2 Function Control for CS2 Address Window Selection for CS2 Timing Control for CS3 Function Control for CS3 Address Window Selection for CS3 Timing Control for CS4 Function Control for CS4 address window selection for CS4 Timing Control for CS5 Function Control for CS5 Address Window Selection for CS5 Timing Control for CS6 Function Control for CS6 Address Window Selection for CS6 Timing Control for CS7 Function Control for CS7 Address Window Selection for CS7 Reset Value 00F0H 0000H 6243H 6243H 6243H 0021H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H 0000H
EBCMOD0 EBCMOD1 TCONCSMM TCONCSSM TCONCS0 FCONCS0 TCONCS1 FCONCS1 ADDRSEL1 TCONCS2 FCONCS2 ADDRSEL2 TCONCS3 FCONCS3 ADDRSEL3 TCONCS4 FCONCS4 ADDRSEL4 TCONCS5 FCONCS5 ADDRSEL5 TCONCS6 FCONCS6 ADDRSEL6 TCONCS7 FCONCS7 ADDRSEL7
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Keyword Index
10
Keyword Index
This section lists a number of keywords which refer to specific details of the C166S V2 in terms of its architecture, its functional units or functions. This helps to quickly find the answer to specific questions about the C166S V2.
A
Address Boundaries 99 Addressing Modes CoREG Addressing Mode 63 IDX Indirect Addressing Mode 56 Indirect Addressing Mode 53 Long Adressing Mode 52 Short Addressing Modes 46
E
EBC 13 End of PEC Interrupt Sub Node 143 External Bus Controller 13 External Bus Idle State 169 External Interrupt 14
F
Fast Bank Switching 131
B
Bit Protection 71 Block Diagram ITC / PEC 119 BWT Bit 140
G
General Purpose Register 100 GPR 100
C
Central System Control 14 CGU 14 Clock Generation Unit 14 Context Pointer Updating 43 Context Switch 40 Continuous PEC Transfers 140 COUNT Bit 140 CP Register 423, 425 CPUCON1 Register 423, 425 CPUCON2 Register 423, 425 CPUID Register 423, 424 CSP Register 423, 425 Cycle counts 194
I
ID Control 14 IDX0 Register 423, 425 IDX1 Register 423, 425 INC Bit 144 Instructions ADD 212 ADDB 213 ADDC 214 ADDCB 215 AND 216 ANDB 217 ASHR 218 ATOMIC 220 BAND 221 BCLR 222 BCMP 223 BFLDH 224 BFLDL 225 BMOV 226 BMOVN 227
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D
Data Page Boundaries 99 Data Page Pointer 49 Data Types 68 DMU 12
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Keyword Index BOR 228 BSET 229 BXOR 230 CALLA 231 CALLI 233 CALLR 234 CALLS 235 CMP 236 CMPB 237 CMPD1 238 CMPD2 239 CMPI1 240 CMPI2 241 CoABS 316, 317 CoADD 318 CoADD2 319 CoASHR 320, 322 CoCMP 324 CoLOAD 325 CoLOAD- 326 CoLOAD2 327 CoLOAD2- 327, 328 CoMAC 329, 331 CoMAC- 333 CoMACM 335, 337 CoMACM- 339 CoMACMR 341, 343 CoMACMRsu 345, 347 CoMACMRu 348, 350 CoMACMRus 351, 353 CoMACMsu 354, 356 CoMACMsu- 357 CoMACMu 358, 360 CoMACMu- 361 CoMACMus 362, 364 CoMACMus- 365 CoMACR 366, 368 CoMACRsu 370, 372 CoMACRu 373, 374 CoMACRus 375, 377 CoMACsu 378, 379 CoMACsu- 380 CoMACu 381, 382
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CoMACu- 383 CoMACus 384, 385 CoMACus- 386 CoMAX 387 CoMIN 388 CoMOV 389 CoMUL 390, 392 CoMUL- 394 CoMULsu 395, 396 CoMULsu- 397 CoMULu 398, 399 CoMULu- 400 CoMULus 401, 402 CoMULus- 403 CoNEG 404, 405 CoNOP 406 CoRND 407 CoSHL 408 CoSHR 410 CoSTORE 412 CoSUB 413 CoSUB2 414 CoSUB2R 415 CoSUBR 416 CPL 242 CPLB 243 DISWDT 244 DIV 245 DIVL 246 DIVLU 247 DIVU 248 EINIT 249 ENWDT 250 EXTP 251 EXTPR 253 EXTR 255 EXTS 256 EXTSR 258 IDLE 260 JB 261 JBC 262 JMPA 264 JMPI 266
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Keyword Index JMPR 267 JMPS 268 JNB 269 JNBS 270 MOV 272 MOVB 274 MOVBS 276 MOVBZ 277 MUL 278 MULU 279 NEG 280 NEGB 281 NOP 282 OR 283 ORB 284 PCALL 285 POP 287 PRIOR 288 PUSH 289 PWRDN 290 RET 291 RETI 292 RETP 293 RETS 294 ROL 295 ROR 297 SBRK 299 SCXT 300 SHL 301 SHR 303 SRST 305 SRVWDT 306 SUB 307 SUBB 308 SUBC 309 SUBCB 310 TRAP 311 XOR 313 XORB 314 Interrrupt Control Register 140 Interrupt Jump Table Cache 125 Interrupt System 118
J
JTAG 13
M
MAH Register 423, 425 MAL Register 423, 425 MCW Register 423, 425 MDC Register 423, 425 MDH Register 423, 425 MDL Register 423, 425 Memory External 98 ROM 93 MRW Register 423, 425 MSW Register 423, 425
N
NMI 117
O
OCDS 13 ONES Register 423, 425
P
PEC 138 Channel Actions 144 Control Register 139 Pointer Address Handling 146 Transfer Count 140 Peripheral Event Controller 138 PMU 12 Power Saving Control 14 Program Memory Unit 12 Protected Bits 71 PSW Register 423, 425
Q
QR0 Register 424 QR1 Register 424 QX0 Register 423, 424 QX1 Register 424
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R
Register CP 423, 425 CPUCON1 423, 425 CPUCON2 423, 425 CPUID 423, 424 CSP 423, 425 DPP0 423, 424 DPP1 423, 424 DPP2 423, 424 DPP3 423, 424 IDX0 423, 425 IDX1 423, 425 MAH 423, 425 MAL 423, 425 MCW 423, 425 MDC 423, 425 MDH 423, 425 MDL 423, 425 MRW 423, 425 MSW 423, 425 ONES 423, 425 PSW 423, 425 QR0 424 QR1 424 QX0 423, 424 QX1 424 SP 424, 425 SPSEG 424, 425 STKOV 424, 425 STKUN 424, 425 TFR 424, 425 VECSEG 424, 425 xxIC 140 ZEROS 424, 425 Reset Control 13
SP Register 424, 425 SPSEG Register 424, 425 STKOV Register 424, 425 STKUN Register 424, 425 System Control Unit 13
T
TFR Register 424, 425 Traps 135
V
VECSEG Register 424, 425
W
Watchdog Timer 14 WDT 14
Z
ZEROS Register 424, 425
S
SCU 13 Segment Boundaries 99 SFR 96 Sleep mode 14
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