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DashDSPTM 28-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End ADMCF341
Individual Enable and Disable for Each PWM Output High-Frequency Chopping Mode for Transformer Coupled Gate Drives External PWMTRIP Pin Integrated 6-Channel ADC Subsystem Three Bipolar ISENSE Inputs with Programmable Sample-and-Hold Amplifier and Overcurrent Protection (Usable as Three Dedicated Analog Inputs) Muxed Auxiliary Analog Inputs Internal Voltage Reference (2.5 V) Acquisition Synchronized to PWM Switching Frequency 9-Pin Digital I/O Port Bit Configurable as Input or Output Change of State Interrupt Support Two 16-Bit Auxiliary PWM Timers Synthesized Analog Output Programmable Frequency 0% to 100% Duty Cycle Two Programmable Operational Modes Independent Mode/Offset Mode Motor Types Permanent Magnet Synchronous Motors (PMSM) Brushless DC Motors (BDCM) AC Induction Motors (ACIM) APPLICATIONS Refrigerator and Air Conditioner Compressor Washing Machines Industrial Variable Speed Drives HVAC
FEATURES 20 MHz Fixed-Point DSP Core Single-Cycle Instruction Execution (50 ns) ADSP-21xx Family Code Compatibility Independent Computational Units ALU, Multiplier/Accumulator, Barrel Shifter Multifunction Instructions Single-Cycle Context Switch Powerful Program Sequencer Zero Overhead Looping Conditional Instruction Execution Two Independent Data Address Generators Memory Configuration 512 16-Bit Data Memory RAM 512 24-Bit Program Memory RAM 4K 24-Bit Program Memory ROM 4K 24-Bit Program Flash Memory Three Independent Flash Memory Sectors 3584 24-Bit, 256 24-Bit, 256 24-Bit Low-Cost Pin-Compatible ROM Option 16-Bit Watchdog Timer Programmable 16-Bit Internal Timer with Prescaler Two Double Buffered Serial Ports with SPI Mode Support Integrated Power-On Reset Function Three-Phase 16-Bit PWM Generation Unit: 16-Bit Center-Based PWM Generator Programmable PWM Pulsewidth Edge Resolution to 50 ns 153 Hz Minimum Switching Frequency Double/Single Duty Cycle Update Mode Control
FUNCTIONAL BLOCK DIAGRAM
MOTOR CONTROL PERIPHERALS ADSP-21xx BASE ARCHITECTURE DATA ADDRESS GENERATORS DAG 1 DAG 2 MEMORY BLOCK PROGRAM ROM 4K x 24 PROGRAM RAM 512 x 24 PROGRAM FLASH 4K x 24 DATA MEMORY 512 x 16 ADC SUBSYSTEM 3 VREF 2.5V ANALOG INPUTS SHA TIMERS 3 ISENSE AMP AND TRIP 6 16-BIT THREEPHASE PWM
PROGRAM SEQUENCER
PROGRAM MEMORY ADDRESS DATA MEMORY ADDRESS PROGRAM MEMORY DATA DATA MEMORY DATA
ARITHMETIC UNITS ALU MAC SHIFTER POR TIMER
SERIAL PORT SPORT 0 SPORT 1 PIO 9
2 x 16-BIT AUX PWM 2
WATCHDOG TIMER
DashDSP is a trademark of Analog Devices, Inc.
7 MULTIPLEXED ON EXTERNAL PINS
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2002
GND = otherwise ADMCF341-SPECIFICATIONS (V = 5%,noted.) 0 V. T = -40 C to +85 C. CLKIN = 10 MHz, unless
DD A
ANALOG-TO-DIGITAL CONVERTER
Parameter Signal Input Resolution1 Linearity Error2 Zero Offset3 Comparator Delay ADC High Level Input Current2 ADC Low Level Input Current2 Min 0.3 3 0 600 Typ Max 3.5 12 4 +7 +10 -10 Unit V Bits Bits mV ns mA mA Conditions/Comments VAUX0, VAUX1, VAUX2
-32
VIN = 3.5 V VIN = 0.0 V
NOTES 1 Resolution varies with PWM switching frequency (double update mode) 78.1 kHz = 8 bits, 4.9 kHz = 12 bits. 2 2.44KHz sample frequency, VAUX0, VAUX1, VAUX2. 3 Extrapolated point outside of operating range. 2.44KHz sample frequency. Specifications subject to change without notice.
ISENSE AMPLIFIER-TRIP
Parameter ISENSE Signal Operating Range ISENSE Signal Input Range ISENSE Gain ISENSE Gain Channel Matching ISENSE Gain Stability1 ISENSE Linearity2 ISENSE Internal Offset Voltage2 ISENSE Internal Offset Stability2 ISENSE Signal-to-Noise Ratio (SNRD)3 ISENSE Signal-to-Noise Ratio Less Distortion (SNR)3 ISENSE Total Harmonic Distortion3 ISENSE Input Current ISENSE Input Resistance TRIP Threshold Low TRIP Threshold High TRIP Minimum Pulsewidth4 Min -400 -800 -2.6 Typ Max +400 +800 -2.34 5.5 Unit mV mV % % % Bits V % dB dB dB dB mA kW mV mV ms Conditions/Comments -2.51 0.8 9 1.87 2.1 51 54 -40 -53 11.5 -690 +430 5 -430 +690 VIN = -400 mV to +400 mV VIN = -400 mV to +400 mV VIN = -400 mV to +400 mV
8 1.68
2.1
-130
+10
VIN = -400 mV to +400 mV
NOTES 1 Variation of gain with V DD and temperature. 2 VIN = -400 mV to +400 mV. 3 fIN = 1 kHz sine wave, V IN = -400 mV to +400 mV, f S = 4 kHz. 4 High or low trip threshold.
CURRENT SOURCE1
Parameter Programming Resolution Tuned Current 2
NOTES 1 For ADC calibration. 2 0.3 V to 3.5 V I CONST voltage.
Min 91
Typ 100
Max 3 109
Unit Bits mA
Conditions/Comments
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ADMCF341 VOLTAGE REFERENCE
Parameter Voltage Level (VREF) Drift
Specifications subject to change without notice.
Min 2.44
Typ 2.50 110
Max 2.55
Unit
Conditions/Comments
V -40C to +85C ppm/C
POWER-ON RESET
Parameter Reset Threshold Hysteresis Reset Active Timeout Period
*216 CLKOUT cycles. Specifications subject to change without notice.
Min 3.20
Typ 3.65 100 3.2*
Max 4.10
Unit V mV ms
Conditions/Comments
ELECTRICAL CHARACTERISTICS
Symbol VIL VIH VOL VOL VOH IIL IIL IIH IIH IIH IOZH IOZL IDD IDD Parameter Low Level Input Voltage High Level Input Voltage Low Level Output Voltage1 Low Level Output Voltage2 High Level Output Voltage Low Level Input Current RESET Pin3 Low Level Input Current High Level Input Current RESET Pin3 High Level Input Current4 High Level Input Current High Level Three-State Leakage Current5 Low Level Three-State Leakage Current5 Supply Current (Idle)6 Supply Current (Dynamic)6 Min 2 0.4 0.8 4 -100 -10 30 100 10 100 -10 55 135 Typ Max 0.8 Unit V V V V V mA mA mA mA mA mA mA mA mA Conditions/Comments
IOL = 2 mA IOL = 2 mA IOH = 0.5 mA VIN = 0 V VIN = 0 V VIN = VDD VIN = VDD VIN = VDD VIN = VDD VIN = 0 V VDD = 5.25 V VDD = 5.25 V
NOTES 1 Output pins PIO0-PIO8, AH, AL, BH, BL, CH, CL. 2 XTAL pin. 3 Internal pull-up, RESET. 4 Internal pull-down, PWMTRIP, PIO0-PIO8. 5 Three stateable pins, DT1, RFS1, TFS1, SCLK1. 6 Outputs not switching. Specifications subject to change without notice.
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ADMCF341
SPECIFICATIONS (continued)
FLASH MEMORY
Parameter Endurance Data Retention Program and Erase Operating Temperature Read Operating Temperature
Specifications subject to change without notice.
Min 10,000 15 0 -40
Typ
Max
Unit Cycles Years C C
Conditions/Comments Cycle = Erase/Program/Verify
85 +85
TIMING PARAMETERS
Parameter
Clock Signals
Min
Max
Unit
Signal tCK is defined as 0.5 tCKIN. The ADMCF341 uses an input clock with a frequency equal to half the instruction rate; a 10 MHz input clock (which is equivalent to 100 ns) yields a 50 ns processor cycle (equivalent to 20 MHz). When tCK values are within the range of 0.5 tCKIN period, they should be substituted for all relevant timing parameters to obtain specification value as in the following example: tCKH = 0.5 tCK - 10 ns = 0.5 50 ns - 10 ns = 15 ns Timing Requirements: tCKIN CLKIN Period CLKIN Width Low tCKIL tCKIH CLKIN Width High Switching Characteristics: CLKOUT Width Low tCKL tCKH CLKOUT Width High tCKOH CLKIN High to CLKOUT High Control Signals Switching Characteristics tRSP RESET Width Low PWM Shutdown Signals Switching Characteristics tPWMTPW PWMTRIP Width Low
*Applies after power-up sequence is complete. Specifications subject to change without notice.
100 20 20 0.5 tCK - 10 0.5 tCK - 10 0
150
ns ns ns ns ns ns
20
5 tCK*
ns
tCK
ns
tCKIN tCKIH
CLKIN
tCKIL tCKOH tCKH
CLKOUT
tCKL
Figure 1. Clock Signals
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ADMCF341 TIMING PARAMETERS
Parameter Serial Ports Timing Requirements SCLK Period tSCK tSCS DR/TFS/RFS Setup before SCLK Low tSCH DR/TFS/RFS Hold after SCLK Low SCLKIN Width tSCP Switching Characteristics tCC CLKOUT High to SCLKOUT tSCDE SCLK High to DT Enable SCLK High to DT Valid tSCDV tRH TFS/RFSOUT Hold after SCLK High tRD TFS/RFSOUT Delay from SCLK High DT Hold after SCLK High tSCDH tSCDD SCLK High to DT Disable tTDE TFS (Alt) to DT Enable TFS (Alt) to DT Valid tTDV tRDV RFS (Multichannel, Frame Delay Zero) to DT Valid
Specifications subject to change without notice.
Min
Max
Unit
100 15 20 40 0.25 tCK 0 0 30 0 30 0 25 30 0.25 tCK + 20 30
ns ns ns ns ns ns ns ns ns ns ns ns ns ns
CLKOUT
t CC
t CC
t SCK
SCLK
t SCS
DR RFSIN TFSIN
t SCH
t SCP t SCP
t RD t RH
RFSOUT TFSOUT
t SCDV t SCDE
DT
t SCDD t SCDH
t TDE t TDV
TFS (ALTERNATE FRAME MODE)
t RDV
RFS (MULTICHANNEL MODE, FRAME DELAY 0 [MFD = 0])
Figure 2. Serial Port Timing
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ADMCF341
ABSOLUTE MAXIMUM RATINGS* PIN FUNCTION DESCRIPTIONS
Supply Voltage (VDD) . . . . . . . . . . . . . . . . . . -0.3 V to +7.0 V Supply Voltage (AVDD) . . . . . . . . . . . . . . . . . -0.3 V to +7.0 V Input Voltage . . . . . . . . . . . . . . . . . . . . . -0.3 V to VDD +0.3 V Output Voltage Swing . . . . . . . . . . . . . . -0.3 V to VDD +0.3 V Operating Temperature Range (Ambient) . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature (5 sec) . . . . . . . . . . . . . . . . . . . . . . . 280C
*Stresses greater than those listed may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions greater than those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Mnemonic PORTA6/DR1 PORTA5/(FL1/DT1) PORTA4/(SCLK1/SCLK0) PORTA3/TFS0 PORTA2/RFS0 PORTA1/DT0 PORTA0/DR0 CLKIN XTAL VDD PWMTRIP ISENSE3 ISENSE2 ISENSE1 VAUX0 VAUX1 VAUX2 ICONST GND RESET CH CL BH BL AH AL PORTA8/(AUX0/CLKOUT) PORTA7/(AUX1/PWMSYNC)
Pin Type I/O I/O I/O I/O I/O I/O I/O I O SUP I I I I I I I O GND I O O O O O O I/O I/O
PIN CONFIGURATION
PORTA6/DR1 1 PORTA5/(FL1/DT1) 2 PORTA4/(SCLK1/SCLK0) 3 PORTA3/TFS0 4 PORTA2/RFS0 5 PORTA1/DT0 6 PORTA0/DR0 7 28 PORTA7/(AUX1/PWMSYNC) 27 PORTA8/(AUX0/CLKOUT) 26 AL 25 AH 24 BL
CL TOP VIEW 22 CLKIN 8 (Not to Scale) 21 CH XTAL 9 VDD 10 20 RESET 19 GND 18 ICONST 17 VAUX2 16 VAUX1 15 VAUX0
ADMCF341
23 BH
PWMTRIP 11 ISENSE3 12 ISENSE2 13 ISENSE1 14
ORDERING GUIDE
Model ADMCF341BR ADMCF341-EVALKIT
Temperature Range -40C to +85C N/A
Instruction Rate 20 MHz N/A
Package Description 28-Lead Wide Body (SOIC) Development Tool Kit
Package Option R-28
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADMCF341 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
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ADMCF341
GENERAL DESCRIPTION
The ADMCF341 is a low-cost, single-chip DSP-based controller, suitable for permanent magnet synchronous motors, ac induction motors, and brushless dc motors. The ADMCF341 integrates a 20 MHz, fixed-point DSP core with a complete set of motor control and system peripherals that permits fast, efficient development of motor controllers. The DSP core of the ADMCF341 is completely code-compatible with the ADSP-21xx DSP family and combines three computational units, data address generators, and a program sequencer. The computational units are an ALU, a multiplier/accumulator (MAC), and a barrel shifter. There are special instructions for bit manipulation, multiplication ( squared), biased rounding, and global interrupt masking. The system peripherals are the power-on reset circuit (POR), the watchdog timer, and two synchronous serial ports. The serial ports are configurable and double buffered, with hardware support for UART, SCI, and SPI port emulation. The ADMCF341 provides 512 24-bit program memory RAM, 4K 24-bit program memory ROM, 4K 24-bit program FLASH memory, and 512 16-bit data memory RAM. The user code can be stored and executed from the flash memory. The program and data memory RAM can be used for dynamic data storage or can be loaded through the serial port from an external device as in other ADMCxxx family parts. The program memory ROM contains a monitor function as well as useful routines for erasing, programming, and verifying the flash memory. The motor control peripherals of the ADMCF341 provide a 12-bit analog data acquisition system with six analog input channels with three dedicated ISENSE inputs (combining internal amplification, sampling, and overcurrent PWM shutdown features) and an internal voltage reference. In addition, a threephase, 16-bit, center-based PWM generation unit can be used
INSTRUCTION REGISTER
to produce high accuracy PWM signals with minimal processor overhead. The ADMCF341 also contains two 16-bit auxiliary PWM timer outputs and nine lines of digital I/O. Because the ADMCF341 has a limited number of pins, functions such as the auxiliary PWM timers and the serial communication ports are multiplexed with the nine programmable digital input/ output (PIO) pins. The pin functions can be independently selected to allow maximum flexibility for different applications.
DSP CORE ARCHITECTURE OVERVIEW
Figure 3 is an overall block diagram of the DSP core of the ADMCF341. The flexible architecture and comprehensive instruction set allow the processor to perform multiple operations in parallel. In one processor cycle (50 ns with a 10 MHz CLKIN) the DSP core can:

Generate the next program address Fetch the next instruction Perform one or two data moves Update one or two data address pointers Perform a computational operation Receive and transmit through the serial ports Decrement the interval timer Generate three-phase PWM waveforms for a power inverter Generate two signals using the 16-bit auxiliary PWM timers Acquire four analog signals Decrement the watchdog timer
This all takes place while the processor continues to:
DATA ADDRESS GENERATOR #1
DATA ADDRESS GENERATOR #2
PM ROM 4K 24 PROGRAM SEQUENCER 14 PM RAM 512 24 PMA BUS DMA BUS
FLASH PROGRAM MEMORY 4K 24
DM RAM 512 16
14
24
PMD BUS
BUS EXCHANGE 16 DMD BUS
INPUT REGS ALU OUTPUT REGS
INPUT REGS MAC OUTPUT REGS 16 R BUS
INPUT REGS SHIFTER OUTPUT REGS
CONTROL LOGIC COMPANDING CIRCUITRY
TIMER TRANSMIT REG RECEIVE REG SERIAL PORT 6
Figure 3. DSP Core Block Diagram
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ADMCF341
The processor contains three independent computational units: the arithmetic and logic unit (ALU), the multiplier/accumulator (MAC), and the shifter. The computational units process 16-bit data directly and have provisions to support multiprecision computations. The ALU performs a standard set of arithmetic and logic operations as well as provides support for division primitives. The MAC performs single-cycle multiply, multiply/add, and multiply/subtract operations with 40 bits of accumulation. The shifter performs logical and arithmetic shifts, normalization, denormalization, and derive-exponent operations. The shifter can be used to efficiently implement numeric format control, including floating-point representations. The internal result (R) bus directly connects the computational units so that the output of any unit may be the input of any unit on the next cycle. A powerful program sequencer and two dedicated data address generators ensure efficient delivery of operands to these computational units. The sequencer supports conditional jumps and subroutine calls and returns in a single cycle. With internal loop counters and loop stacks, the ADMCF341 executes looped code with zero overhead; no explicit jump instructions are required to maintain the loop. Two data address generators (DAGs) provide addresses for simultaneous dual operand fetches from data memory and program memory. Each DAG maintains and updates four address pointers (I registers). Whenever the pointer is used to access data (indirect addressing), it is post-modified by the value in one of four modifications (M registers). A length value may be associated with each pointer (L registers) to implement automatic modulo addressing for circular buffers. The circular buffering feature is also used by the serial ports for automatic data transfers to and from on-chip memory. DAG1 generates only data memory addresses and provides an optional bit-reversal capability. DAG2 may generate either program or data memory addresses but has no bit-reversal capability. Efficient data transfer is achieved with the use of five internal buses: modes of operation. Serial port 1 (SPORT1) is available with a limited number of I/Os. It is mainly intended for codebooting to serial ROMs (SROM) and support of the debugging tools. SPORT0 and SPORT1 can generate an internal programmable serial clock or accept an external serial clock. A programmable interval counter is also included in the DSP core and can be used to generate periodic interrupts. A 16-bit count register (TCOUNT) is decremented every n processor cycles, where n - 1 is a scaling value stored in the 8-bit TSCALE register. When the value of the counter reaches zero, an interrupt is generated, and the count register is reloaded from a 16-bit period register (TPERIOD). The ADMCF341 instruction set provides flexible data moves and multifunction (one or two data moves with a computation) instructions. Each instruction is executed in a single 50 ns processor cycle (for a 10 MHz CLKIN). The ADMCF341 assembly language uses an algebraic syntax for ease of coding and readability. A comprehensive set of development tools supports program development. For further information on the DSP core, refer to the ADSP-2100 Family User's Manual, Third Edition, with particular reference to the ADSP-2171.
SERIAL PORTS
The ADMCF341 incorporates two complete synchronous serial ports (SPORT1 and SPORT0) for serial communication and multiprocessor communication. Following is a brief list of capabilities of the ADMCF341 SPORTs. Refer to the ADSP-2100 Family User's Manual, Third Edition, for further details.
SPORTs are bidirectional and have a separate, double-buffered transmit and receive section. serial clock internally.
SPORTs use an external serial clock or generate their own SPORTs have independent framing for the receive and
transmit sections. Sections run in a frameless mode or with frame synchronization signals internally or externally generated. Frame synchronization signals are active high or inverted, with either of two pulsewidths and timings.

Program memory address (PMA) bus Program memory data (PMD) bus Data memory address (DMA) bus Data memory data (DMD) bus Result (R) bus
SPORTs support serial data word lengths from 3 bits to
Program memory can store both instructions and data, permitting the ADMCF341 to fetch two operands in a single cycle-- one from program memory and one from data memory. The ADMCF341 can fetch an operand from on-chip program memory and the next instruction in the same cycle. The ADMCF341 writes data from its 16-bit registers to the 24-bit program memory using the PX register to provide the lower 8 bits. When it reads data (not instructions) from 24-bit program memory to a 16-bit data register, the lower 8 bits are placed in the PX register. The ADMCF341 can respond to a number of distinct DSP core and peripheral interrupts. The DSP interrupts comprise a serial port receive interrupt, a serial port transmit interrupt, a timer interrupt, and two software interrupts. Additionally, the motor control peripherals include two PWM interrupts and a PIO interrupt. Serial port 0 (SPORT0) provides a complete synchronous serial interface with optional companding in hardware and a wide variety of framed and unframed data transmit and receive -8-
16 bits and provides optional A-law and m-law companding according to ITU (formerly CCITT) recommendation G.711. interrupts on completing a data word transfer.
SPORT receive and transmit sections can generate unique SPORTs can receive and transmit an entire circular buffer
of data with only one overhead cycle per data word. An interrupt is generated after a data buffer transfer.
SPORT0 has a multichannel interface to selectively receive
and transmit a 24-word, or 32-word, timedivision multiplexed, serial bitstream. only). The clock phase and polarity are programmable through the MODECTRL register.
SPORT0 can be configured as an SPI port (master mode SPORT1 is the default port for program/data memory boot
loading and for development tools interface. The DT1/FL1 pin can be configured as SROM/E2PROM reset signal.
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PIN FUNCTION DESCRIPTION Table II. Program Memory Map
The ADMCF341 is available in a 28-lead SOIC package. Table I describes the pins.
Table I. Pin List
Address Range 0x0000-0x002F 0x0030-0x01FF 0x0200-0x07FF 0x0800-0x17FF 0x1800-0x1FFF 0x2000-0x20FF 0x2100-0x21FF 0x2200-0x2FFF 0x3000-0x3FFF
Memory Type RAM RAM ROM FLASH FLASH FLASH
Function Internal Vector Table User Program Memory Reserved Reserved Program Memory Reserved User Program Memory Sector 0 User Program Memory Sector 1 User Program Memory Sector 2 Reserved
Pin Group Name
RESET SPORT11 SPORT01 CLKOUT CLKIN, XTAL PORTA0- PORTA81 AUX0-AUX11 AH-CL PWMTRIP ISENSE1- ISENSE3 VAUX0-VAUX2 ICONST VDD GND
No. of Input/ Pins Output Function
1 2 5 11 2 9 2 6 1 3 3 1 1 1 I I/O I/O I/O I, O I/O O O I I I O I I Processor Reset Input Serial Port 1 Pins (DT1/FL1, DR1, SCLK1/SCLK0 2) Serial Port 0 Pins (DT0, DR0 TFSO, SCLK1/SCLK0 2) Processor Clock Output External Clock or Quartz Crystal Connection Point Digital I/O Port Pins Auxiliary PWM Outputs PWM Outputs PWM Trip Signal ISENSE Inputs Auxiliary Analog Inputs ADC Constant Current Source Power Supply Ground
Table III. Data Memory Map
Address Range 0x0000-0x1FFF 0x2000-0x20FF 0x2100-0x37FF 0x3800-0x39FF 0x3A00-0x3BFF 0x3C00-0x3FFF
Memory Type
Function Reserved Memory Mapped Registers Reserved User Data Memory Reserved Memory Mapped Registers
RAM RAM
NOTES 1 Multiplexed pins, individually selectable through PORTA_SELECT and PORTA_DATA registers. 2 SCLK1/SCLK0 multiplexed signals. Selectable through MODECTRL Register Bit 4.
FLASH MEMORY SUBSYSTEM
INTERRUPT OVERVIEW
The ADMCF341 has 4K 24-bits of user-programmable, nonvolatile flash memory. A flash programming utility is provided with the development tools, which perform the basic device programming operations: erase, program, and verify. The flash memory array is portioned into three asymmetrically sized sectors of 256 words, 256 words, and 3584 words, labeled sector 0, sector 1, and sector 2, respectively. These sectors are mapped into external program memory address space. Four flash memory interface registers are connected to the DSP. These 16-bit registers are mapped into the register area of data memory space. They are named flash memory control register (FMCR), flash memory address register (FMAR), flash memory data register low (FMDRL), and flash memory data register high (FMDRH). These registers are diagrammed later in this data sheet. They are used by the flash memory programming utility. The user program may read these registers, but should not modify them directly. The flash programming utility provides a complete interface to the flash memory. It should be noted that the core accesses flash memory through an external memory interface that multiplexes the program memory and data memory buses into a single external bus. Therefore, if more than one external transfer must be made in the same instruction, there will be at least an overhead cycle required.
The ADMCF341 can respond to 18 different interrupt sources with minimal overhead, seven of which are internal DSP core interrupts and 11 from the motor control peripherals. The seven DSP core interrupts are SPORT1 receive (or IRQ0) and transmit (or IRQ1), SPORT0 receive and transmit, the internal timer, and two software interrupts. The motor control peripheral interrupts are the nine programmable I/Os and two from the PWM (PWMSYNC pulse and PWMTRIP). All motor control interrupts are multiplexed into the DSP core through the peripheral IRQ2 interrupt. The interrupts are internally prioritized and individually maskable. A detailed description of the entire interrupt system of the ADMCF341 is presented later, following a more detailed description of each peripheral block.
MEMORY MAP
The ADMCF341 has two distinct memory types: program and data. In general, program memory contains user code and coefficients, while the data memory is used to store variables and data during program execution. Three kinds of program memory are provided on the ADMCF341: RAM, ROM, and FLASH. The motor control peripherals are memory mapped into a region of the data memory space starting at 0x2000. The complete program and data memory maps are given in Tables II and III, respectively.
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ADMCF341
Special Flash Registers
22pF CLKOUT XTAL 10MHz CLKIN 22pF
The flash module has four nonvolatile 8-bit registers called special flash registers (SFRs) that are accessible independent of the main flash array, via the flash programming utility. These registers are for general-purpose, nonvolatile storage. When erased, the special flash registers contain all 0s. To read special flash registers from the user program, call the read_reg routine contained in ROM. Refer to the ADMCF34x DSP Motor Controller Developers Reference Manual for an example.
Boot-from-Flash Code
ADMCF341
RESET
Figure 4. Basic System Configuration
Clock Signals
A security feature is available in the form of a code that, when set, causes the processor to execute the program in flash memory at power-up or reset. In this mode, the flash programming utility and debugger are unable to communicate with the ADMCF341. Consequently, the contents of the flash memory can be neither programmed nor read. The boot-from-flash code may be set via the flash programming utility, when the user's program is thoroughly tested and loaded into flash program memory at address 0x2200. The user's program must contain a mechanism for clearing the boot-from-flash code if reprogramming the flash memory is desired. The only way to clear boot-from-flash is from within the user program, by calling the flash_init or auto_erase_reg routines that are included in the ROM. The user program must be signaled in some way to call the necessary routine to clear the boot-from-flash code. An example would be to detect a high level on a PIO pin during startup initialization and then call the flash_init or auto_erase_reg routine. The flash_init routine will erase the entire user program in flash memory before clearing the boot-from-flash code, thus ensuring the security of the user program. If security is not a concern, the auto_erase_reg routine can be used to clear the boot-from-flash code while leaving the user program intact. Refer to the ADMCF34x DSP Motor Controller Developer's Reference Manual for further instructions and an example of using the boot-from-flash code.
FLASH PROGRAM BOOT SEQUENCE
The ADMCF341 can be clocked either by a crystal or a TTLcompatible clock signal. For normal operation, the CLKIN input cannot be halted, changed during operation, or operated below the specified minimum frequency. If an external clock is used, it should be a TTL-compatible signal running at half the instruction rate. The signal is connected to the CLKIN pin of the ADMCF341. In this mode, with an external clock signal, the XTAL pin must be left unconnected. The ADMCF341 uses an input clock with a frequency equal to half the instruction rate; a 10 MHz input clock yields a 50 ns processor cycle (which is equivalent to 20 MHz). Normally, instructions are executed in a single processor cycle. All device timing is relative to the internal instruction rate, which is indicated by the CLKOUT signal when enabled. Because the ADMCF341 includes an on-chip oscillator feedback circuit, an external crystal may be used instead of a clock source, as shown in Figure 4. The crystal should be connected across the CLKIN and XTAL pins, with two capacitors as shown in Figure 4. A parallel-resonant, fundamental frequency, microprocessor grade crystal should be used. A clock output signal (CLKOUT) is generated by the processor at the processor's cycle rate of twice the input frequency.
Reset
On power-up or reset, the processor begins instruction execution at address 0x0800 of internal program ROM. The ROM monitor program that is located there checks the boot-fromflash code. If that code is set, the processor jumps to location 0x2200 in external flash program memory, where it expects to find the user's application program. If the boot-from-flash code is not set, the monitor attempts to boot from an external device as described in the ADMCF34x DSP Motor Controller Developers Reference Manual.
SYSTEM INTERFACE
The ADMCF341 DSP core and peripherals must be correctly reset when the device is powered up to assure proper unitization. The ADMCF341 contains an integrated power-on-reset (POR) circuit that provides a complete system reset on powerup and power-down. The POR circuit monitors the voltage on the ADMCF341 VDD pin and holds the DSP core and peripherals in reset while VDD is less than the threshold voltage level, VRST. When this voltage is exceeded, the ADMCF341 is held in reset for an additional 216 DSP clock cycles (TRST in Figure 5). During this time (TRST), the supply voltage must reach the recommended operating condition. On power-down, when the voltage on the VDD pin falls below VRST -VHYST, the ADMCF341 will be reset. Also, if the external RESET pin is actively pulled low at any time after power-up, a complete hardware reset of the ADMCF341 is initiated.
VRST VDD
Figure 4 shows a basic system configuration for the ADMCF341 with an external crystal.
VRST - VHYST
TRST
RESET
Figure 5. Power-On Reset Operation
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The ADMCF341 sets all internal stack pointers to the empty stack condition, masks all interrupts, clears the MSTAT register, and performs a full reset of all of the motor control peripherals. Following a power-up, it is possible to initiate a DSP core and motor control peripheral reset by pulling the RESET pin low. The RESET signal must be the minimum pulsewidth specification, tRSP. Following the reset sequence, the DSP core starts executing code from the internal PM ROM located at 0x0800.
DSP Control Registers
PWM switching patterns for control of brushless dc motors (BDCM), including electronically commutated motors (ECM). The six PWM output signals consist of three high side drive signals (AH, BH, and CH) and three low side drive signals (AL, BL, and CL). The switching frequency, dead time, and minimum pulsewidths of the generated PWM patterns are programmable using, respectively, the PWMTM, PWMDT, and PWMPD registers. In addition, three registers (PWMCHA, PWMCHB, and PWMCHC) control the duty cycles of the three pairs of PWM signals. Each of the six PWM output signals can be enabled or disabled by separate output enable bits of the PWMSEG register. In addition, three control bits of the PWMSEG register permit crossover of the two signals of a PWM pair for easy control of ECM or BDCM. In crossover mode, the high side PWM signals are diverted to the complementary low side output and the low side signals are diverted to the corresponding high side outputs. In many applications, there is a need to provide an isolation barrier in the gate-drive circuits that turn on the power devices of the inverter. In general, there are two common isolation techniques: optical isolation using optocouplers, and transformer isolation using pulse transformers. The PWM controller of the ADMCF341 permits mixing of the output PWM signals with a high-frequency chopping signal to permit an easy interface to such pulse transformers. The features of this gate-drive chopping mode can be controlled by the PWMGATE register. There is an 8-bit value within the PWMGATE register that directly controls the chopping frequency. In addition, highfrequency chopping can be independently enabled for the high side and the low side outputs using separate control bits in the PWMGATE register.
The DSP core has a system control register, SYSCNTL, memory-mapped at DM (0x3FFF). SPORT1 must be configured as a serial port by setting Bit 10. SPORT0 and SPORT1 are enabled by setting Bit 11 and Bit 12. The DSP core has a wait state control register, MEMWAIT, memory-mapped at DM (0x3FFE). The default value of this register is 0xFFFF. For proper operation of the ADMCF341, this register must always contain the value 0x8000. This value sets the minimum access time to the program memory. The configurations of both the SYSCNTL and MEMWAIT registers of the ADMCF341 are shown at the end of the data sheet.
THREE-PHASE PWM CONTROLLER Overview
The PWM generator block of the ADMCF341 is a flexible, programmable three-phase PWM waveform generator that can be programmed to generate the required switching patterns to drive a three-phase voltage source inverter for ac induction motors (ACIM) or permanent magnet synchronous motors (PMSM). In addition, the PWM block contains special functions that considerably simplify the generation of the required
PWM CONFIGURATION REGISTERS PWMTM (15...0) PWMDT (9...0) PWMPD (9...0) PWMSYNCWT (7...0) MODECTRL (6)
PWM DUTY CYCLE REGISTERS PWMCHA (15...0) PWMCHB (15...0) PWMCHC (15...0) PWMSEG (8...0) PWMGATE (9...0)
THREE-PHASE PWM TIMING UNIT CLK SYNC RESET
OUTPUT CONTROL UNIT SYNC
GATE DRIVE UNIT CLK CLKOUT
AH AL BH BL CH CL
PWMSYNC TO INTERRUPT CONTROLLER PWMTRIP OR ISENSE1 OVERCURRENT TRIP ANALOG BLOCK ISENSE2 ISENSE3 PWMTRIP
PWMSWT (0) PWM SHUTDOWN CONTROLLER
Figure 6. Overview of the PWM Controller of the ADMCF341
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The PWM generator is capable of operating in two distinct modes: single update mode and double update mode. In single update mode, the duty cycle values are programmable only once per PWM period, so that the resultant PWM patterns are symmetrical about the midpoint of the PWM period. In double update mode, a second updating of the PWM duty cycle values is implemented at the midpoint of the PWM period. In this mode, it is possible to produce asymmetrical PWM patterns that produce lower harmonic distortion in three-phase PWM inverters. This technique also permits the closed-loop controller to change the average voltage applied to the machine winding at a faster rate, allowing wider closed-loop bandwidths to be achieved. The operating mode of the PWM block (single or double update mode) is selected by a control bit in MODECTRL register. The PWM generator of the ADMCF341 also provides an internal signal that synchronizes the PWM switching frequency to the A/D operation. In single update mode, a PWMSYNC pulse is produced at the start of each PWM period. In double update mode, an additional PWMSYNC pulse is produced at the midpoint of each PWM period. The width of the PWMSYNC pulse is programmable through the PWMSYNCWT register. The PWM signals produced by the ADMCF341 can be shut off in a number of different ways. First, there is a dedicated asynchronous PWM shutdown pin, PWMTRIP, which, when brought LOW, instantaneously places all six PWM outputs in the OFF state. In addition, PWM shutdown is initiated when the voltage on any of the input pins (ISENSE) exceeds the trip thresholds (high or low) or the input is unconnected (floating). Because these two hardware shutdown mechanisms are asynchronous, and the associated PWM disable circuitry does not use clocked logic, the PWM will shut down even if the DSP clock is not running. The PWM system may also be shut down from software by writing to the PWMSWT register. Status information about the PWM system of the ADMCF341 is available to the user in the SYSSTAT register. In particular, the state of PWMTRIP is available, as well as a status bit that indicates whether the operation is in the first half or the second half of the PWM period. A functional block diagram of the PWM controller is shown in Figure 6. The generation of the six output PWM signals on pins AH to CL is controlled by four important blocks: The PWM controller is driven by a clock at the same frequency as the DSP instruction rate, CLKOUT, and is capable of generating two interrupts to the DSP core. One interrupt is generated on the occurrence of a PWMSYNC pulse, and the other is generated on the occurrence of any PWM shutdown action.
Three-Phase Timing Unit
The 16-bit three-phase timing unit is the core of the PWM controller and produces three pairs of pulsewidth modulated signals with high resolution and minimal processor overhead. There are four main configuration registers (PWMTM, PWMDT, PWMPD, and PWMSYNCWT) that determine the fundamental characteristics of the PWM outputs. In addition, the operating mode of the PWM (single or double update mode) is selected by bit 6 of the MODECTRL register. These registers, in conjunction with the three 16-bit duty cycle registers (PWMCHA, PWMCHB and PWMCHC), control the output of the three-phase timing unit.
PWM Switching Frequency: PWMTM Register
The PWM switching frequency is controlled by the PWM period register, PWMTM. The fundamental timing unit of the PWM controller is tCK = 1/fCLKOUT, where fCLKOUT is the CLKOUT frequency (DSP instruction rate). Therefore, for a 20 MHz CLKOUT, the fundamental time increment is 50 ns. The value written to the PWMTM register is effectively the number of tCK clock increments in half a PWM period. The required PWMTM value is a function of the desired PWM switching frequency (fPWM) and is given by:
PWMTM =
fCLKOUT fCLKIN = 2 fPWM fPWM
Therefore, the PWM switching period, TS, can be written as:
TS = 2 PWMTM t CK
For example, for a 20 MHz CLKOUT and a desired PWM switching frequency of 10 kHz (TS = 100 ms), the correct value to load into the PWMTM register is:
PWMTM =
20 106 = 1000 = 0x 3E 8 2 10 103
The three-phase PWM timing unit, which is the core of the
PWM controller, generates three pairs of complemented and dead-time-adjusted center-based PWM signals.
The largest value that can be written to the 16-bit PWMTM register is 0xFFFF = 65,535, which corresponds to a minimum PWM switching frequency of: f PWM,min = 20 106 = 153 Hz 2 65, 535
The output control unit allows the redirection of the out-
puts of the three-phase timing unit for each channel to either the high side or the low side output. In addition, the output control unit allows individual enabling/disabling of each of the six PWM output signals. and its subsequent mixing with the PWM signals.
for a CLKOUT frequency of 20 MHz.
PWM Switching Dead Time: PWMDT Register
The GATE drive unit provides the high chopping frequency The PWM shutdown controller manages the three PWM
shutdown modes (via the PWMTRIP pin, the analog block, or the PWMSWT register) and generates the correct RESET signal for the timing unit.
The second important PWM block parameter that must be initialized is the switching dead time. This is a short delay time introduced between turning off one PWM signal (e.g., AH) and turning on its complementary signal (e.g., AL). This short time delay is introduced to permit the power switch being turned off to completely recover its blocking capability before the complementary switch is turned on. This time delay prevents a potentially destructive short-circuit condition from developing across the dc link capacitor of a typical voltage source inverter.
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Dead time is controlled by the PWMDT register. The dead time is inserted into the three pairs of PWM output signals. The dead time, TD, is related to the value in the PWMDT register by:
TD = PWMDT 2 tCK = 2 PWMDT fCLKOUT
Therefore, a PWMDT value of 0x00A (= 10), introduces a 1 ms delay between the turn-off of any PWM signal (for example, AH) and the turn-on of its complementary signal (for example, AL). The amount of the dead time can therefore be programmed in increments of 2 tCK (or 100 ns for a 20 MHz CLKOUT). The PWMDT register is a 10-bit register. For a CLKOUT rate of 20 MHz its maximum value of 0x3FF (= 1023) corresponds to a maximum programmed dead time of:
TD max = 1023 2 tCK = 1023 2 50 10-9 sec = 102 ms
operation in the first half of each PWM period (between the rising edge of the original PWMSYNC pulse and the rising edge of the new PWMSYNC pulse, which is introduced in double update mode). Bit 3 of the SYSSTAT register is set during the second half of each PWM period. If required, a user may determine the status of this bit during a PWMSYNC interrupt service routine. The advantages of double update mode are that lower harmonic voltages can be produced by the PWM process and wider control bandwidths are possible. However, for a given PWM switching frequency, the PWMSYNC pulses occur at twice the rate in the double update mode. Because new duty cycle values must be computed in each PWMSYNC interrupt service routine, there is a larger computational burden on the DSP in double update mode.
Width of the PWMSYNC Pulse: PWMSYNCWT Register
The dead time can be programmed to zero by writing 0 to the PWMDT register.
PWM Operating Mode: MODECTRL and SYSSTAT Registers
The PWM controller of the ADMCF341 can operate in two distinct modes: single update mode and double update mode. The operating mode of the PWM controller is determined by the state of Bit 6 of the MODECTRL register. If this bit is cleared, the PWM operates in the single update mode. Setting Bit 6 places the PWM in the double update mode. By default, following either a peripheral reset or power-on, Bit 6 of the MODECTRL register is cleared. This means that the default operating mode is single update mode. In single update mode, a single PWMSYNC pulse is produced in each PWM period. The rising edge of this signal marks the start of a new PWM cycle and is used to latch new values from the PWM configuration registers (PWMTM, PWMDT, PWMPD, and PWMSYNCWT) and the PWM duty cycle registers (PWMCHA, PWMCHB, and PWMCHC) into the three-phase timing unit. The PWMSEG register is also latched into the output control unit on the rising edge of the PWMSYNC pulse. In effect, this means that the parameters of the PWM signals can be updated only once per PWM period at the start of each cycle. Thus, the generated PWM patterns are symmetrical about the midpoint of the switching period. In double update mode, there is an additional PWMSYNC pulse produced at the midpoint of each PWM period. The rising edge of this new PWMSYNC pulse is again used to latch new values of the PWM configuration registers, duty cycle registers, and the PWMSEG register. As a result, it is possible to alter both the characteristics (switching frequency, dead time, minimum pulsewidth, and PWMSYNC pulsewidth) and the output duty cycles at the midpoint of each PWM cycle. Consequently, it is possible to produce PWM switching patterns that are no longer symmetrical about the midpoint of the period (asymmetrical PWM patterns). In double update mode, operation in the first half or the second half of the PWM cycle is indicated by bit 3 of the SYSSTAT register. In double update mode, this bit is cleared during
The PWM controller of the ADMCF341 produces an internal PWM synchronization pulse at a rate equal to the PWM switching frequency in single update mode and at twice the PWM frequency in double update mode. This PWMSYNC synchronizes the operation of the PWM unit with the A/D converter system. The width of this PWMSYNC pulse is programmable by the PWMSYNCWT register. The width of the PWMSYNC pulse, TPWMSYNC, is given by:
TPWMSYNC = tCK ( PWMSYNCWT + 1)
which means that the width of the pulse is programmable from tCK to 256 tCK (corresponding to 50 ns to 12.8 ms for a CLKOUT rate of 20 MHz). Following a reset, the PWMSYNCWT register contains 0x27 (= 39) so that the default PWMSYNC width is 2.0 ms.
PWM Duty Cycles: PWMCHA, PWMCHB, PWMCHC Registers
The duty cycles of the six PWM output signals are controlled by the three duty cycle registers, PWMCHA, PWMCHB, and PWMCHC. The integer value in the register PWMCHA controls the duty cycle of the signals on AH and AL. PWMCHB controls the duty cycle of the signals on BH and BL, and PWMCHC controls the duty cycle of the signals on CH and CL. The duty cycle registers are programmed in integer counts of the fundamental time unit, tCK, and define the desired on-time of the high side PWM signal produced by the three-phase timing unit over half the PWM period. The switching signals produced by the three-phase timing unit are also adjusted to incorporate the programmed dead time value in the PWMDT register. The PWM is center-based. This means that in single update mode the resulting output waveforms are symmetrical and centered in the PWMSYNC period. Figure 7 presents a typical PWM timing diagram illustrating the PWM-related registers (PWMCHA, PWMTM, PWMDT, and PWMSYNCWT) control over the waveform timing in both half cycles of the PWM period. The magnitude of each parameter in the timing diagram is determined by multiplying the integer value in each register by tCK (typically 50 ns). It may be seen in the timing diagram how dead time is incorporated into the waveforms by moving the switching edges away from the original values set in the PWMCHA register.
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ADMCF341
PWMCHA PWMCHA PWMCHA1 PWMCHA2 AH 2 AL AL PWMSYNC PWMSYNCWT + 1 PWMSYNC SYSSTAT (3) PWMSYNCWT1 + 1 PWMSYNCWT2 + 1 PWMDT 2 PWMDT AH 2 PWMDT1 2 PWMDT2
SYSSTAT (3)
PWMTM
PWMTM
PWMTM1
PWMTM2
Figure 7. Typical PWM Outputs of Three-Phase Timing Unit in Single Update Mode
Figure 8. Typical PWM Outputs of Three-Phase Timing Unit in Double Update Mode
Each switching edge is moved by an equal amount (PWMDT tCK) to preserve the symmetrical output patterns. The PWMSYNC pulse, whose width is set by the PWMSYNCWT register, is also shown. Bit 3 of the SYSSTAT register indicates which half cycle is active. This can be useful in double update mode, as will be discussed later. The resultant on-times of the PWM signals shown in Figure 7 may be written as:
In general, the on-times of the PWM signals in double update mode are defined by: TAH = (PWMCHA1 + PWMCHA2 PWMDT1 - PWMDT2 ) TCK TAL = (PWMTM1 + PWMTM2 - PWMCHA1 PWMCHA2 - PWMDT1 - PWMDT2 ) tCK
d AH = TAH = TS
TAH = 2 ( PWMCHA - PWMDT ) tCK
TAL = 2 ( PWMTM - PWMCHA - PWMDT ) tCK
The corresponding duty cycles are:
d AH =
d AL =
TAH PWMCHA - PWMDT = TS PWMTM
TAL PWMTM - PWMCHA - PWMDT = TS PWMTM
PWMCHA1 + PWMCHA2 PWMDT1 + PWMDT2 PWMTM1 + PWMTM2 PWMTM1 + PWMTM2
d AL =
TAL PWMTM1 + PWMTM2 + PWMCHA1 = TS PWMTM1 + PWMTM2
Obviously, negative values of TAH and TAL are not permitted because the minimum permissible value is zero, corresponding to a 0% duty cycle. In a similar fashion, the maximum value is TS, corresponding to a 100% duty cycle. The output signals from the timing unit for operation in double update mode are shown in Figure 8. This illustrates a completely general case where the switching frequency, dead time, and duty cycle are all changed in the second half of the PWM period. Of course, the same value for any or all of these quantities could be used in both halves of the PWM cycle. However, it can be seen that there is no guarantee that symmetrical PWM signals will be produced by the timing unit in this double update mode. Additionally, it is seen that the dead time is inserted into the PWM signals in the same way as in single update mode.
PWMCHA2 + PWMDT1 + PWMCHA1 PWMTM1 + PWMTM2
because for the completely general case in double update mode, the switching period is given by:
TS = ( PWMTM1 + PWMTM2 ) tCK
Again, the values of TAH and TAL are constrained to lie between zero and TS. PWM signals similar to those illustrated in Figure 7 and Figure 8 can be produced on the BH, BL, CH, and CL outputs by programming the PWMCHB and PWMCHC registers in a manner identical to that described for PWMCHA. The PWM controller does not produce any PWM outputs until all of the PWMTM, PWMCHA, PWMCHB, and PWMCHC registers have been written to at least once. After these registers have been written, the counters in the three-phase timing unit are enabled. Writing to these registers also starts the main PWM timer. If, during initialization, the PWMTM register is written before the PWMCHA, PWMCHB, and PWMCHC registers, the first PWMSYNC pulse (and interrupt if enabled) will be generated (1.5 tCK PWMTM) seconds after the initial write to the PWMTM register in single update mode. In double update mode, the first PWMSYNC pulse will be generated (tCK PWMTM) seconds after the initial write to the PWMTM register in single update mode. REV. 0
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ADMCF341
Effective PWM Resolution
In single update mode, the same values of PWMCHA, PWMCHB, and PWMCHC are used to define the on-times in both half cycles of the PWM period. As a result, the effective resolution of the PWM generation process is 2 tCK (or 100 ns for a 20 MHz CLKOUT), since incrementing one of the duty cycle registers by one changes the resultant on-time of the associated PWM signals by tCK in each half period (or 2 tCK for the full period). In double update mode, improved resolution is possible since different values of the duty cycle registers are used to define the on-times in both the first and second halves of the PWM period. As a result, it is possible to adjust the on-time over the whole period in increments of tCK. This corresponds to an effective PWM resolution of tCK in double update mode (or 50 ns for a 20 MHz CLKOUT).
Table IV. Achievable PWM Resolution in Single and Double Update Modes
will remain OFF (0% duty cycle). Additionally, the AL signal will be turned ON for the entire half period (100% duty cycle).
Output Control Unit: PWMSEG Register
The operation of the output control unit is managed by the 9-bit read/write PWMSEG register. This register sets two distinct features of the output control unit that are directly useful in the control of ECM or BDCM. The PWMSEG register contains three crossover bits, one for each pair of PWM outputs. Setting bit 8 of the PWMSEG register enables the crossover mode for the AH/AL pair of PWM signals; setting bit 7 enables crossover on the BH/BL pair of PWM signals; and setting bit 6 enables crossover on the CH/CL pair of PWM signals. If crossover mode is enabled for any pair of PWM signals, the high side PWM signal from the timing unit (for example, AH) is diverted to the associated low side output of the output control unit so that the signal will ultimately appear at the AL pin. Of course, the corresponding low side output of the timing unit is also diverted to the complementary high side output of the output control unit so that the signal appears at pin AH. Following a reset, the three crossover bits are cleared so that the crossover mode is disabled on all three pairs of PWM signals. The PWMSEG register also contains six bits (bits 0 to 5) that can be used to individually enable or disable each of the six PWM outputs. If the associated bit of the PWMSEG register is set, the corresponding PWM output is disabled regardless of the value of the corresponding duty cycle register. This PWM output signal will remain in the OFF state as long as the corresponding enable/disable bit of the PWMSEG register is set. The PWM output enable function gates the crossover function. After a reset, all six enable bits of the PWMSEG register are cleared, thereby enabling all PWM outputs by default. In a manner identical to the duty cycle registers, the PWMSEG is latched on the rising edge of the PWMSYNC signal so that changes to this register only become effective at the start of each PWM cycle in single update mode. In double update mode, the PWMSEG register can also be updated at the midpoint of the PWM cycle. In the control of an ECM, only two inverter legs are switched at any time, and often the high side device in one leg must be switched ON at the same time as the low side driver in a second leg. Therefore, by programming identical duty cycles for two PWM channels (for example, let PWMCHA = PWMCHB) and setting bit 7 of the PWMSEG register to cross over the BH/BL pair of PWM signals, it is possible to turn ON the high side switch of phase A and the low side switch of phase B at the same time. In the control of an ECM, one inverter leg (phase C in this example) is disabled for a number of PWM cycles. This disable may be implemented by disabling both the CH and CL PWM outputs by setting bits 0 and 1 of the PWMSEG register. This is illustrated in Figure 7, where it can be seen that both the AH and BL signals are identical, because PWMCHA = PWM CHB, and the crossover bit for phase B is set. In addition, the other four signals (AL, BH, CH, and CL) have been disabled by setting the appropriate enable/disable bits of the PWMSEG register. For the situation illustrated in Figure 9, the appropriate value for the PWMSEG register is 0x00A7. In ECM operation, because each inverter leg is disabled for a certain period of time, the PWMSEG register is changed based upon the position of the rotor shaft (motor commutation).
Resolution Single Update Mode Double Update Mode (Bit) (kHz) PWM Frequency (kHz) PWM Frequency 8 9 10 11 12 39.1 19.5 9.8 4.9 2.4 78.4 39.1 19.5 9.8 4.9
Minimum Pulsewidth: PWMPD Register
In many power converter switching applications, it is desirable to eliminate PWM switching pulses shorter than a certain width. It takes a finite time to both turn on and turn off modern power semiconductor devices. Therefore, if the width of any of the PWM pulses is shorter than some minimum value, it may be desirable to completely eliminate the PWM switching for that particular cycle. The allowable minimum on-time for any of the six PWM outputs for half a PWM period that can be produced by the PWM controller may be programmed using the PWMPD register. The minimum on-time is programmed in increments of tCK so that the minimum on-time produced for any half PWM period, TMIN, is related to the value in the PWMPD register by:
TMIN = PWMPD tCK
A PWMPD value of 0x002 defines a permissible minimum on-time of 100 ns for a 20 MHz CLKOUT. In each half cycle of the PWM, the timing unit checks the ontime of each of the six PWM signals. If any of the times is found to be less than the value specified by the PWMPD register, the corresponding PWM signal is turned OFF for the entire half period, and its complementary signal is turned completely ON. Consider the example where PWMTM = 200, PWMCHA = 5, PWMDT = 3, and PWMPD = 10 with a CLKOUT of 20 MHz, while operating in single update mode. For this case, the PWM switching frequency is 50 kHz and the dead time is 300 ns. The minimum permissible on-time of any PWM signal over one-half of any period is 500 ns. Clearly, for this example, the dead-time adjusted on-time of the AH signal for one-half a PWM period is (5-3) 50 ns = 100 ns. Because this is less than the minimum permissible value, output AH of the timing unit REV. 0
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ADMCF341
PWMCHA = PWMCHB
PWMCHA
AH 2 AL BH BL PWMDT 2 PWMDT
PWMCHA
AH
2
AL
PWMDT
2
PWMDT
[4 PWMTM
(GDCLK+1)]
PWMTM
CH CL PWMTM PWMTM
Figure 10. Typical PWM Signals with HighFrequency Gate Chopping Enabled on Both High Side and Low Side Switches. (GDCLK Is the Integer Equivalent of the Value in Bits 0 to 7 of the PWMGATE Register.)
PWM Shutdown
Figure 9. An Example of PWM Signals Suitable for ECM Control. PWMCHA = PWMCHB, BH/BL are a Crossover Pair. AL, BH, CH, and CL Outputs are Disabled. Operation Is in Single Update Mode.
Gate Drive Unit: PWMGATE Register
The gate drive unit of the PWM controller adds features that simplify the design of isolated gate drive circuits for PWM inverters. If a transformer-coupled power device gate drive amplifier is used, the active PWM signal must be chopped at a high frequency. The PWMGATE register allows the programming of this high-frequency chopping mode. The chopped active PWM signals may be required for the high side drivers only, for the low side drivers only, or for both the high side and low side switches. Therefore, independent control of this mode for both high side and low side switches is included with two separate control bits in the PWMGATE register. Typical PWM output signals with high-frequency chopping enabled on both high side and low side signals are shown in Figure 10. Chopping of the high side PWM outputs (AH, BH and CH) is enabled by setting Bit 8 of the PWMGATE register. Chopping of the low side PWM outputs (AL, BL, and CL) is enabled by setting Bit 9 of the PWMGATE register. The high chopping frequency is controlled by the 8-bit word (GDCLK) written to Bits 0 to 7 of the PWMGATE register. The period and the frequency of this high-frequency carrier are:
TCHOP = 4 (GDCLK ) + 1 tCK
In the event of external fault conditions, it is essential that the PWM system be instantaneously shut down. Two methods of sensing a fault condition are provided by the ADMCF341. For the first method, a low level on the PWMTRIP pin initiates an instantaneous, asynchronous (independent of DSP clock) shutdown of the PWM controller. This places all six PWM outputs in the OFF state, disables the PWMSYNC pulse and associated interrupt signal, and generates a PWMTRIP interrupt signal. The PWMTRIP pin has an internal pull-down resistor so that even if the pin becomes disconnected, the PWM outputs will be disabled. The state of the PWMTRIP pin can be read from Bit 0 of the SYSSTAT register. The second method for detecting a fault condition is through the ISENSE pins of the analog block of the ADMCF341. When the voltage at any of the ISENSE pins exceeds the trip threshold (high or low), or the ISENSE pin is in high impedance (floating), PWMTRIP will be internally pulled low. The negative edge of the internal PWMTRIP will generate a shutdown in the same manner as a negative edge on pin PWMTRIP. It is possible through software to initiate a PWM shutdown by writing to the 1-bit read/write PWMSWT register (0x2061). Writing to this bit generates a PWM shutdown in a manner identical to the PWMTRIP or ISENSE pins. Following a PWM shutdown, it is possible to determine if the shutdown was generated from hardware or software by reading the same PWMSWT register. Reading this register also clears it. Restarting the PWM after a fault condition is detected requires clearing the fault and reinitializing the PWM. Clearing the fault requires PWMTRIP to return to a HIGH state and ISENSE to return to a voltage in the ISENSE trip level range. After the fault has been cleared, the PWM can be restarted by writing to registers PWMTM, PWMCHA, PWMCHB, and PWMCHC. After the fault is cleared and the PWM registers are initialized, internal timing of the three-phase timing unit will resume, and the new duty cycle values will be latched on the next rising edge of PWMSYNC.
PWM Registers
[
]
fCHOP =
[4 (GDCLK + 1)]
fCLKOUT
The GDCLK value may range from 0 to 255, corresponding to a programmable chopping frequency rate from 19.5 kHz to 5 MHz for a 20 MHz CLKOUT rate. The gate drive features must be programmed before operation of the PWM controller and typically are not changed during normal operation of the PWM controller. Following a reset, by default, all bits of the PWMGATE register are cleared so that high-frequency chopping is disabled.
The configuration of the PWM registers is described at the end of the data sheet. The parameters of the PWM block are tabulated in Table V.
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Table V. Fundamental Characteristics of PWM Generation Unit of ADMCF341
Parameter 16-BIT PWM TIMER Counter Resolution Edge Resolution (Single Update Mode) Edge Resolution (Double Update Mode) Programmable Dead Time Range Programmable Dead Time Increments Programmable Pulse Deletion Range Programmable Pulse Deletion Increments PWM Frequency Range PWMSYNC Pulsewidth (TCRST) Gate Drive Chop Frequency Range
NOTES 1 153 Hz is calculated based on 16-bit resolution. 2 78,431 Hz is calculated based on 8-bit resolution.
Min
Typ 16 100 50
Max
Unit Bits ns ns ms ns ms ns Hz ms MHz
0 100 0 50 1531 2.0 0.02
102 51 78,4312 12.8 5
ADC Overview
The ADC of the ADMCF341 is based upon the single slope conversion technique. This approach offers an inherently monotonic conversion process within the noise and stability of its components, and there will be no missing codes. The single slope technique has been adopted on the ADMCF341 for four channels that are simultaneously converted. Refer to Figure 11 for the functional schematic of the ADC. The main inputs (ISENSE1 to ISENSE3) are connected to the ADC converter through three front end blocks. Figure 15 shows the block diagram of a single front end block. Each front end block has a bipolar current amplifier (gain = -2.5) designed to acquire the voltage on a current-sensing resistor, whose voltage can be either positive or negative with respect to the power supply ground rail. The fourth channel has been configured with a serially connected 4-to-1 multiplexer. Table VI shows the multiplexer input selection codes. One of these auxiliary multiplexed channels is used to acquire the internal voltage reference (VREF) for calibration purposes.
Table VI. ADC Auxiliary Channel Selection
ISENSE1
ICONST_TRIM REG <2:0> MODECTRL REG <09..10..11> VOLTAGE CURRENT FILTER ICONST MODECTRL REG <07> CLK COMP VOLTAGE CURRENT CHANNEL2 COMP VOLTAGE ISENSE3 CURRENT CHANNEL3 COMP VAUX0 (V) VAUX1 (V) VAUX2 (V) VAUX3 (V) VREF ICONST MODECTRL REG <0..1> ADC1 ADC2 ADC3 ADCAUX V3L V2L V1L 12-BIT ADC TIMER BLOCK
CHANNEL1
ISENSE2
VAUX0 VAUX1 VAUX2
4-1 MULTIPLEXER
COMP
VAUXL
CAPACITOR RESET PWMSYNC (CONVST)
Select VAUX0 VAUX1 VAUX2 Calibration (VREF)
MODECTRL (1) ADCMUX1 0 0 1 1
MODECTRL (0) ADCMUX0 0 1 0 1
Figure 11. ADC Overview
Single Slope ADC Operations
The ADC conversion process is done by comparing each ADC input to a reference ramp voltage and timing the comparison of the two signals. The actual conversion point is the time-point intersection of the input voltage and the ramp voltage (VC), as shown in Figure 12. This time is converted to counts by the 12bit ADC timer block and is stored in the ADC registers. The ramp voltage used to perform the conversion is generated by driving a fixed current into an off-chip capacitor, where the capacitor voltage is:
VC = ( I C ) t
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Following reset, VC = 0 at t = 0. This reset and the start of the conversion process are initiated by the PWMSYNC pulse, as shown in Figure 12. The width of the PWMSYNC pulse is controlled by the PWMSYNCWT register and should be programmed according to Figure 13 to ensure complete resetting. In order to compensate for IC process manufacturing tolerances (and to adjust for capacitor tolerances), the current source of the ADMCF341 is software-programmable. Using software to set the magnitude of the ICONST current generator is accomplished by selecting one of eight steps over approximately 20% current range.
VC VCMAX V1
ADC Resolution
The ADC is intrinsically linked to the PWM block through the PWMSYNC pulse's control of the ADC conversion process. Because of this link, the effective resolution of the ADC is a function of both the PWM switching frequency and the rate at which the ADC counter timer is clocked. For a CLKOUT period of tCK and a PWM period of TPWM, the maximum count of the ADC is given by: Max Count = min ( 4095, (TPWM - TCRST )/ 2 tCK ) for MODECTRL Bit 7 = 0 Max Count = min ( 4095, (TPWM - TCRST )/ tCK ) for MODECTRL Bit 7 = 1 where TPWM is equal to the PWM period if operating in single update mode or equal to half that period if operating in double update mode. For an assumed CLKOUT frequency of 20 MHz and PWMSYNC pulsewidth of 2.0 ms, the effective resolution of the ADC block is tabulated for various PWM switching frequencies in Table VII.
Table VII. ADC Resolution Examples
TVIL TPWM - TCRST PWMSYNC
TCRST
PWM Frequency (kHz) 2.4 4 8 18 25
MODECTRL[7] = 0 Max Effective Count Resolution 4095 2480 1230 535 380 12 >11 >10 >9 >8
MODECTRL[7] = 1 Max Effective Count Resolution 4095 4095 2460 1070 760 12 12 >11 >10 >9
COMPARATOR OUTPUT
Figure 12. Analog Input Block Operation
The ADC system consists of four comparators and a single timer, which may be clocked at either the DSP rate or half the DSP rate, depending on the setting of the ADCCNT bit (bit 7) of the MODECTRL register. When this bit is cleared, the timer counts at a slower rate of CLKIN. When this bit is set, it counts at CLKOUT or twice the rate of CLKIN. ADC1, ADC2, ADC3, and ADCAUX are the registers that capture the conversion times, which are the timer values when the associated comparator trips.
200
Programmable Current Source
150
DECIMAL COUNTS
The ADMCF341 has an internal current source that is used to charge an external capacitor, generating the voltage ramp used for conversion. The magnitude of the output of the current source circuit is subject to manufacturing variations and can vary from one device to the next. Therefore, the ADMCF341 includes a programmable current source whose output can always be tuned to within 5% of the target 100 mA. A 3-bit register, ICONST_TRIM, allows the user to make this adjustment. The output current is proportional to the value written to the register: 0x0 produces the minimum output and 0x7 produces the maximum output. The default value of ICONST_TRIM after reset is 0x0.
Charging Capacitor Selection
100
50
The charging capacitor value is selected based on the sample (PWM) frequency desired. A too-small capacitor value will reduce the available resolution of the ADC by having the ramp voltage rise rapidly and convert too quickly, not utilizing all possible counts available in the PWM cycle. A too-large capacitor may not convert in the available PWM cycle returning 0x000. To select a charging capacitor use Figure 14. Select the sampling frequency desired, determine if the current source is to be tuned to a nominal 100 mA or left in the default (0x0 code) trim state, then determine the proper charge capacitor off the appropriate curve.
0 0 2 4 6 8 10 CHARGING CAPACITOR - nF
Figure 13. PWMSYNCWT Program Value
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100
VOLTAGE (THIS IS NOT AVAILABLE EXTERNALLY ON THE ADMCF341)
TRIP REF HIGH TRIP REF LOW OVERCURRENT COMPARATOR
TRIP (TO PWMTRIP FILTER)
CNOM - nF
TUNED ICONST
MUX
CURRENT -2.5 SHA PWMSYNC SHA STATE MACHINE CLOCKOUT SHA TIMER COUNTER
100
10
VxL (TO ADC)
DEFAULT ICONST
1 1 10
Figure 14. Timing Capacitor Selection
Analog Front End
SHA TIMER REGISTER
ADC CONVERSION STATUS BIT (ADC REGISTER) MODECTRL REGISTER CHANNEL SELECTION (ISENSE/V)
The main analog inputs of the ADMCF341 (ISENSE1 to ISENSE3) are connected to the ADC converter through three front end blocks. Figure 15 shows the block diagram of a single analog front end.
1 CYCLE N-1 2 N 3 4 N+1 5 6 N+2 7
Figure 15. Analog Front End Block Diagram
8 N+3
9
10 N+4
11
12 N+5
PWMSYNC
VC TSAMPLE SHA TIMER COUNTER TSAMPLE TSAMPLE TRACK SHA STATUS X T H T H
TSAMPLE
H
T
H
ISENSE INPUT
S
S
S
S
ADC REGISTER
DATA READY SAMPLED ON CYCLE N-2
INVALID LSB = 1
DATA READY SAMPLED ON CYCLE N
INVALID LSB = 1
DATA READY SAMPLED ON CYCLE N+2
DATA READY SAMPLED ON CYCLE N+4
Figure 16. ADC Conversion Sequence of a Current Input
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Table VIII. Fundamental Characteristics of Auxiliary PWM Timers
Parameter Resolution PWM Frequency
Test Conditions 10 MHz CLKIN
Min 0.152
Typ 16
Max
Unit Bits MHz
Each analog front end has two analog inputs: voltage and current. A 2-to-1 multiplexer selects which input will be converted; the multiplexer selection is determined by the MODECTRL register. Note that in the ADMCF341 only the current inputs (ISENSE) are externally available. The current input (ISENSE) is amplified through a bipolar amplifier (gain -2.5). There is an output offset that matches the amplifier output signal range to the input signal range of the A/D converter. The amplifier has built-in overcurrent and opencircuit protection. The overcurrent protection shuts the PWM Block when the voltage at any of the ISENSE pins exceeds the trip threshold (high or low). The open-circuit detection shuts the PWM block when any of the ISENSE inputs is in high impedance (for example, the current sense resistor or transducer is disconnected). The shutdown signals generated by the amplifiers are then OR-ed and filtered in order to avoid a spurious trip caused by the switching of the power devices. The amplifier is followed by a sample-and-hold amplifier (SHA). The SHA time is userprogrammable through the SHA timer register. The sampling time is set as a delay from the rising edge of the PWMSYNC signal and is calculated as:
TSAMPLE = (SHA _ CNT + 2) tCK
During the acquire phase (the PWMSYNC cycle during the sampling of the input value) the conversion takes place. However, the value on the ADC registers is not considered valid. This condition is signaled by the ADC by setting the LSB of the ADC register to high. On cycle N + 4, at the rising edge of the PWMSYNC signal (9), the timer counter is reloaded with a value smaller than the PWMSYNC pulsewidth. In this case the SHA samples within the PWMSYNC pulsewidth and the conversion takes place in the same PWMSYNC cycle [from (10) to (11)].
AUXILIARY PWM TIMERS Overview
The SHA timer counter has a minimum reload value of 0x0003, which ensures a minimum settling time of the SHA output in case the user is programming the SHA timer register to a value smaller than 0x0003. This means that the sampling time is programmable from 5 tCK to 65,535 tCK (corresponding to 250 ns to 3.28 ms for a CLKOUT rate of 20 MHz). The sampling time is limited, however, to the rising edge of the following PWMSYNC cycle. Each channel has an independent amplifier, SHA, and SHA timing unit/state machine. Figure 16 shows a conversion sequence of a single channel. At the beginning of the cycle N (rising edge of PWMSYNC signal (1), the timer counter is loaded with the value contained in the SHA_CNT register. After the timer counter has been reloaded, it starts counting down at the CLKOUT rate. In this phase the SHA state-machine forces the SHA in TRACK (sample) status. When the counter reaches the value of 0x0000 (after the time TSAMPLE from the rising edge of PWMSYNC), the SHA statemachine forces the SHA in HOLD status. The conversion of the sampled value is then taking place in the cycle N + 1 [from (4) to (5)] in Figure 16 and the result of the conversion is available on the ADC register at the cycle N + 2 [rising edge of PWMSYNC (5)]. On cycle N + 2, the reload value of the timer counter exceeds the period of the PWMSYNC signal. In this case the SHA statemachine forces the SHA in HOLD status at the rising edge of PWMSYNC of the next cycle (7). The conversion then takes place on cycle N + 3, and the conversion result is available on the ADC register at the cycle N + 4 [rising edge of PWMSYNC (9)].
The ADMCF341 provides two variable frequency, variable duty cycle, 16-bit, auxiliary PWM outputs that, when enabled, are available at the AUX1 and AUX0 pins. These auxiliary PWM outputs can be used to provide switching signals to other circuits in typical motor control systems, such as power factor corrected front end converters or other switching power converters. Alternatively, by adding a suitable filter network, the auxiliary PWM output signals can be used as simple single-bit digital-to-analog converters as shown in Figure 17. The auxiliary PWM system of the ADMCF341 can operate in two different modes: independent mode and offset mode. The operating mode of the auxiliary PWM system is controlled by Bit 8 of the MODECTRL register. Setting Bit 8 of the MODECTRL register places the auxiliary PWM system in the independent mode. In this mode, the two auxiliary PWM generators are completely independent and separate switching frequencies and duty cycles may be programmed for each auxiliary PWM output. In this mode, the 16-bit AUXTM0 register sets the switching frequency of the signal at the AUX0 output pin. Similarly, the 16-bit AUXTM1 register sets the switching frequency of the signal at the AUX1 pin. The fundamental time increment for the auxiliary PWM outputs is twice the DSP instruction rate (or 2 tCK) and the corresponding switching periods are given by:
TAUX 0 = 2 ( AUXTM 0 + 1) tCK TAUX 1 = 2 ( AUXTM1 + 1) tCK
Since the values in both AUXTM0 and AUXTM1 can range from 0 to 0xFFFF, the achievable switching frequency of the auxiliary PWM signals may range from 152.59 Hz to 10 MHz for a CLKOUT frequency of 20 MHz. The on-time of the two auxiliary PWM signals is programmed by the two 16-bit AUXCH0 and AUXCH1 registers, according to: TON , AUX 0 = 2 ( AUXCH 0) tCK TON , AUX 1 = 2 ( AUXCH1) tCK so that output duty cycles from 0% to 100% are possible. Duty cycles of 100% are produced if the on-time value exceeds the period value. Typical auxiliary PWM waveforms in independent mode are shown in Figure 18a. When bit 8 of the MODECTRL register is cleared, the auxiliary PWM channels are placed
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in offset mode. In offset mode, the switching frequency of the two signals on the AUX0 and AUX1 pins are identical and controlled by AUXTM0 in a manner similar to that previously described for independent mode. In addition, the on-times of both the AUX0 and AUX1 signals are controlled by the AUXCH0 and AUXCH1 registers as before. In this mode, however, the AUXTM1 register defines the offset time from the rising edge of the signal on the AUX0 pin to that on the AUX1 pin according to:
TOFFSET = 2 ( AUXTM1 + 1) tCK
2 2 AUX0 AUXCH0 (AUXTM0 + 1)
2 AUX1 2 2 (AUXTM1 + 1)
(AUXTM0 + 1)
AUXCH1
For correct operation in this mode, the value written to the AUXTM1 register must be less than the value written to the AUXTM0 register. Typical auxiliary PWM waveforms in offset mode are shown in Figure 18b. Again, duty cycles from 0% to 100% are possible in this mode. In both operating modes, the resolution of the auxiliary PWM system is 16 bits only at the minimum switching frequency (AUXTM0 = AUXTM1 = 65,535 in independent mode, AUXTM0 = 65,535 in offset mode). Obviously, as the switching frequency is increased, the resolution is reduced. Values can be written to the auxiliary PWM registers at any time. However, new duty cycle values written to the AUXCH0 and AUXCH1 registers only become effective at the start of the next cycle. Writing to the AUXTM0 or AUXTM1 registers causes the internal timers to be reset to 0 and new PWM cycles to begin. By default following a reset, bit 8 of the MODECTRL register is cleared, thus enabling offset mode. In addition, the registers AUXTM0 and AUXTM1 default to 0xFFFF, corresponding to the minimum switching frequency and zero offset. The on-time registers AUXCH0 and AUXCH1 default to 0x0000.
AUXPWM R1 R2 C1 C2
Figure 18b. Typical Auxiliary PWM Signals (All Times in Increments of tCK), Offset Mode
WATCHDOG TIMER
The ADMCF341 incorporates a watchdog timer that can perform a full reset of the DSP and motor control peripherals in the event of software error. The watchdog timer is enabled by writing a timeout value to the 16-bit WDTIMER register. The timeout value represents the number of CLKIN cycles required for the watchdog timer to count down to zero. When the watchdog timer reaches zero, a full DSP core and motor control peripheral reset is performed. In addition, bit 1 of the SYSSTAT register is set so that after a watchdog reset, the ADMCF341 can determine that the reset was due to the timeout of the watchdog timer and was not an external reset. Following a watchdog reset, bit 1 of the SYSSTAT register may be cleared by writing zero to the WDTIMER register. This clears the status bit but does not enable the watchdog timer. On reset, the watchdog timer is disabled and is only enabled when the first timeout value is written to the WDTIMER register. To prevent the watchdog timer from timing out, the user must write to the WDTIMER register at regular intervals (shorter than the programmed WDTIMER period value). On all but the first write to WDTIMER, the particular value written to the register is unimportant, since writing to WDTIMER simply reloads the first value written to this register.
PROGRAMMABLE DIGITAL INPUT/OUTPUT
R1 = R2 = 13k C1 = C2 = 10nF
Figure 17. Auxiliary PWM Output Filter
Auxiliary PWM Interface, Registers, and Pins
The registers of the auxiliary PWM system are summarized at the end of the data sheet.
The ADMCF341 has a nine-pin programmable digital input/ output (PIO) port (PORTA). The nine pins (PORTA0- PORTA8) are multiplexed with other on-chip peripheral functions, in accordance with Table IX. When configured as a PIO, each of these nine pins can act as an input or output, or an interrupt source. The operating mode (PIO or alternate function) of pins PORTA0 to PORTA8 is controlled by the PORTA_SELECT register. This 9-bit register has a bit for each input so that the mode of each pin may be selected individually. Bit 0 of PORTA_SELECT controls the operation of the PORTA0 pin, bit 1 controls the PORTA1 pin, etc. Setting the appropriate bit in the PORTA_SELECT register causes the corresponding pin to be configured for PIO functionality. Clearing the bit selects the alternate mode of the corresponding pin. Following power-on reset, all bits of PORTA_SELECT are set such that PIO functionality is selected. The second alternate function of PORTA7 is selected by bit 14 of the PORTA_SELECT register. The second alternate function of
2 2 AUX0 AUXCH0
(AUXTM0 + 1)
2 AUX1
AUXCH1
2
(AUXTM1 + 1)
2
AUXCH1
Figure 18a. Typical Auxiliary PWM Signals (All Times in Increments of tCK), Independent Mode
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Table IX. Port A Multiplexing
PORTA Pin PORTA8 PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0
First Alternate Function (Peripheral) AUX0 (Auxiliary PWM Output) AUX1 (Auxiliary PWM Output) DR1 (Data Receive SPORT1) FL1 (Flag Out SPORT1) SCLK1 (Serial Clock SPORT1) TFS0 (Transmit Frame Sync SPORT0) RFS0 (Receive Frame Sync SPORT0) DT0 (Data Transmit SPORT0) DR0 (Data Receive SPORT0)
Second Alternate Function (Peripheral) CLKOUT (System CLOCK) PWMSYNC (PWM) None DT1 (Data Transmit SPORT1) SCLK0 (Serial Clock SPORT0) None None None None
PORTA8 is selected by bit 15 of the PORTA_SELECT register. The second alternate function of the PORTA4 and PORTA5 pins is selected by bit 4 of MODECTRL Register (SPORT1 mode: boot mode/UART mode). Once PIO functionality has been selected for any or all of these nine pins, the direction may be set by the 9-bit PORTA_DIR register. Clearing any bit configures the corresponding PIO line as an input, while setting the bit configures it as an output. By default, following a reset all bits of PORTA_DIR are cleared, configuring the PIO lines as inputs. The data of the PORTA0 to PORTA8 lines is controlled by the PORTA_DATA register. These registers can be used to read data from those PIO lines configured as inputs and write data to those configured as outputs. Any of the nine pins that have been configured for PIO functionality can be made to act as an interrupt source by setting the appropriate bit of the PORTA_INTEN register. In order to act as an interrupt source the pin must also be configured as an input. An interrupt is generated upon a change of state (low-tohigh transition or high-to-low transition) on any input that has been configured as an interrupt source. Following a change of state event on any such input, the corresponding bit is set in the PORTA_FLAG register and a common PIO interrupt is generated. Reading the PORTA_FLAG register permits determining the interrupt source. Reading the PORTA_FLAG register automatically clears all bits of the registers. Following power-on or reset, all bits of PORTA_INTEN are cleared so that no interrupts are enabled. Each PIO line has an internal pull-down resistor so that following power-on or reset all nine lines are configured as input PIOs and will be read as logic lows if left unconnected.
PIO Registers
the internal timer, and two software interrupts. The motor control interrupts are the nine PORTA PIOs and two from the PWM block (PWMSYNC pulse and PWMTRIP). All the on-chip peripheral interrupts are multiplexed into the DSP core via the peripheral IRQ2 interrupt. They are also internally prioritized and individually maskable. The start address in the interrupt vector table for the ADMCF341 interrupt sources is shown in Table X. The interrupts are listed from highest to lowest priority. The PWMSYNC interrupt is triggered by a low-to-high transition on the PWMSYNC pulse. The PWMTRIP interrupt is triggered on a high-to-low transition on the PWMTRIP pin. A PIO interrupt is detected on any change of state (high-to-low or low-to-high) on the PIO lines. The entire interrupt control system of the ADMCF341 is configured and controlled by the IFC, IMASK, and ICNTL registers of the DSP core, the IRQFLAG register for the PWMSYNC and PWMTRIP interrupts, and PORTA_FLAG register for the PIO interrupts.
Table X. Interrupt Vector Addresses
Interrupt Source PWMTRIP Peripheral Interrupt (IRQ2) PWMSYNC PIO Software Interrupt 1 Software Interrupt 0 SPORT0 Transmit Interrupt SPORT0 Receive Interrupt SPORT1 Transmit Interrupt (or IRQ1) SPORT1 Receive Interrupt (or IRQ0) Timer
Interrupt Masking
Interrupt Vector Address 0x002C (Highest Priority) 0x0004 0x000C 0x0008 0x0018 0x001C 0x0010 0x0014 0x0020 0x0024 0x0028 (Lowest Priority)
The configuration of all registers of the PIO system is shown at the end of the data sheet.
INTERRUPT CONTROL
The ADMCF341 can respond to 18 different interrupt sources with minimal overhead. Seven of these interrupts are internal DSP core interrupts and 11 are from the on-chip peripherals. The seven DSP core interrupts are SPORT0 receive and transmit, SPORT1 receive (or IRQ0) and transmit (or IRQ1),
Interrupt masking (or disabling) is controlled by the IMASK register of the DSP core. This register contains individual bits that must be set to enable the various interrupt sources. If any peripheral interrupt is to be enabled, the IRQ2 interrupt enable bit (bit 9) of the IMASK register must be set. The configuration of the IMASK register of the ADMCF341 is shown at the end of the data sheet.
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Interrupt Configuration SYSTEM CONTROLLER
The IFC and ICNTL registers of the DSP core control and configure the interrupt controller of the DSP core. The IFC register is a 16-bit register that may be used to force and/or clear any of the eight DSP interrupts. Bits 0 to 7 of the IFC register may be used to clear the DSP interrupts while Bits 8 to 15 can be used to force a corresponding interrupt. Writing to Bits 11 and 12 in IFC is the only way to create the two software interrupts. The ICNTL register is used to configure the sensitivity (edge- or level-) of the IRQ0, IRQ1, and IRQ2 interrupts and to enable/disable interrupt nesting. Setting Bit 0 of ICNTL configures the IRQ0 as edge-sensitive, while clearing the bit configures it as level-sensitive. Bit 1 is used to configure the IRQ1 interrupt and Bit 2 is used to configure the IRQ2 interrupt. It is recommended that the IRQ2 interrupt always be configured as level-sensitive as this ensures that no peripheral interrupts are lost. Setting Bit 4 of the ICNTL register enables interrupt nesting. The configuration of both IFC and ICNTL registers is shown at the end of the data sheet.
INTERRUPT OPERATION
The system controller block of the ADMCF341 performs the following functions: 1. 2. 3. 4. 5. 6. 7. 8. 9. Manages the interface and data transfer between the DSP core and the motor control peripherals. Handles interrupts generated by the motor control peripherals and generates a DSP core interrupt signal IRQ2. Controls the ADC multiplexer select lines. Enables PWMTRIP and PWMSYNC interrupts. Controls the multiplexing of the SPORT1 and SPORT0 pins. Controls the PWM single/double update mode. Controls the ADC conversion time modes and the SHA timers. Controls the auxiliary PWM operation mode. Contains a status register (SYSSTAT) that indicates the state of the PWMTRIP pin, the watchdog timer, and the PWM timer.
Following a reset, the ROM code on the ADMCF341 must copy a default interrupt vector table into program memory RAM from address 0x0000 to 0x002F. Since each interrupt source has a dedicated four-word space in this vector table, it is possible to code short interrupt service routines (ISR) in place. Alternatively, it may be necessary to insert a JUMP instruction to the appropriate start address of the ISR if the ISR requires more memory. When an interrupt occurs, the program sequencer ensures that there is no latency (beyond synchronization delay) when processing unmasked interrupts. In the case of the timer, SPORT0, SPORT1, and software interrupts, the interrupt controller automatically jumps to the appropriate location in the interrupt vector table. At this point, a JUMP instruction to the appropriate ISR is required. Motor control peripheral interrupts are slightly different. When a peripheral interrupt is detected, a bit is set in the IRQFLAG register for PWMSYNC and PWMTRIP or in the PORTA_FLAG register for a PIO interrupt, and the IRQ2 line is pulled low until all pending interrupts are acknowledged. The DSP software must determine the source of the interrupts by reading the IRQFLAG register. If more than one interrupt occurs simultaneously, the higher priority interrupt service routine is executed. Reading the IRQFLAG register clears the PWMTRIP and PWMSYNC bits and acknowledges the interrupt, thus allowing further interrupts when the ISR exits. A user's PIO interrupt service routine must read the PORTA_FLAG register to determine which PIO port is the source of the interrupt. Reading register PORTA_FLAG clears all bits in the registers and acknowledges the interrupt, thus allowing further interrupts after the ISR exits. The configuration of all these registers is shown at the end of the data sheet.
10. Performs a reset of the motor control peripherals and control registers following a hardware, software, or watchdog initiated reset.
SPORT1 and SPORT0 Control
The ADMCF341 has two serial ports: SPORT0 and SPORT1. SPORT1 is available with a limited number of pins and is mainly intended as a secondary port for development tools interfacing and/or code booting from, as well as external serial memory. Figure 19 shows the internal multiplexing of the SPORT0 and SPORT1 signals. SPORT0 is intended as a general-purpose communication port. SPORT0 can support the following operating modes: SPORT, UART, and SPI.
SPORT1 Configuration
There are two operating modes for SPORT1: boot mode and UART mode. These modes are selectable through Bit 4 of the MODECTRL register. With SPORT1 in boot mode, the SPORT1 serial clock (SCLK1) is externally available through the SCLK1/SCLK0 pin. The signal SCLK1 is used to drive the external serial memory input clock. The SPORT1 flag signal (FL1) is externally available through the FL1/DT1 pin. This signal is used to drive the external serial memory input reset. With SPORT1 configured in UART mode, the SPORT0 serial clock (SCLK0) is externally available through the SCLK1/ SCLK0 pin. The SPORT1 data transmit (DT1) is externally available through the FL1/DT1 pin.
SPORT0 Configuration
SPORT0 can be configured in the following modes: SPORT mode, UART mode, and SPI mode. SPORT0 can be configured for UART mode. In this mode the DR0 and RFS0 signals of the internal serial port are connected together. SPORT0 can be configured to operate as the master SPI interface. The SPI mode is set through Bit 14 of the MODECTRL register. When SPORT0 is configured as the SPI interface, the SPORT I/O pins assume the configuration shown in Table XI.
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Table XI. SPORT0 Pin Assignment in SPI Mode
SPORT I/O Signal DT0 (Data Transmit)
SPI Mode MOSI (Master Output/ Slave Input) MISO (Master Input/ Slave Output) SS (Slave Select) Unused SCK (Serial Clock)
SPI Mode I/O Output
The slave select pin automatically generates the select signal at each word transfer. This pin can also be used as a generalpurpose I/O during the SPI transfer without affecting the SPORT operations. The SPI clock polarity and phase are configurable through Bits 13 and 12 of the MODECTRL Register. The SPI transfer using clock phase is shown in Figures 20 and 21.
DR0
Input
TFS0 RFS0 SCLK0
Output N/A Output
MODECTRL REGISTER (04) SPORT1 BOOT MODE/UART MODE
DT1 FL1 DSP CORE SPORT1 TFS1 RFS1 DR1 SCLK1
DT1/FL1
DR1
SCLK1/SCLK0
DT1 FL1 DSP CORE SPORT0 TFS1 RFS1 SCLK1 SPI CONTROL BLOCK DT0 DR0 TFS0
RFS0
MODECTRL REGISTER (15) SPORT0 SPORT MODE/UART MODE
MODECTRL REGISTER (14..13..12) SPORT0 SPI INTERFACE CONTROL
Figure 19. SPORT0 and SPORT1 Internal Multiplexing (Simplified Diagram)
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SCK CYCLE # 1 2 3 4 5 N
SCK (POLARITY = 0) SCK (POLARITY = 1) SS
MOSI SEE NOTE 1 MOSO SEE NOTE 2
MSB MSB
LSB LSB
NOTE 1. LSB OF PREVIOUSLY TRANSMITTED WORD 2. UNDEFINED
Figure 20. SPI Transfer Using Clock Phase CPHA = 0
SCK CYCLE # 1 2 3 4 5 N
SCK (POLARITY = 0) SCK (POLARITY = 1) SS
MOSI SEE NOTE 1 MOSO SEE NOTE 2
MSB MSB
LSB LSB
NOTES 1. LSB OF PREVIOUSLY TRANSMITTED WORD 2. UNDEFINED
Figure 21. SPI Transfer Using Clock Phase CPHA = 1
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Table XII. Peripheral Register Map
Address (hex) 0x2000 0x2001 0x2002 0x2003 0x2004 0x2005 0x2006 0x2007 0x2008 0x2009 0x200A 0x200B 0x200C 0x200D 0x200E 0x200F 0x2010 0x2011 0x2012 0x2013 0x2014 0x2015 0x2016 0x2017 0x2018 0x2019 . . . 48 0x2049 0x204A . . . 5F 0x2060 0x2061 0x2062 . . . 67 0x2068 0x2069 0x206A 0x206B 0x2070 0x2080 0x2081 0x2082 0x2083 0x2084 . . . FF
Name ADC1 ADC2 ADC3 ADCAUX PORTA_DIR PORTA_DATA PORTA_INTEN PORTA_FLAG PWMTM PWMDT PWMPD PWMGATE PWMCHA PWMCHB PWMCHC PWMSEG AUXCH0 AUXCH1 AUXTM0 AUXTM1 MODECTRL SYSSTAT IRQFLAG WDTIMER PORTA-SELECT PWMSYNCWT PWMSWT ICONST_TRIM SHA1_TM SHA2_TM SHA3_TM FMCR FMAR FMDRH FMDRL
Bits Used [15 . . . 4] [15 . . . 4] [15 . . . 4] [15 . . . 4] [8 . . . 0] [8 . . . 0] [8 . . . 0] [8 . . . 0] [15 . . . 0] [9 . . . 0] [9 . . . 0] [9 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [8 . . . 0] [7 . . . 0] [7 . . . 0] [7 . . . 0] [7 . . . 0] [8 . . . 0] [3 . . . 0] [1 . . . 0] [15 . . . 0] [8 . . . 0] [7 . . . 0] [0] [2 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [11 . . . 0] [13 . . . 0] [15 . . . 0]
Function ADC Results for ISENSE1 ADC Results for ISENSE2 ADC Results for ISENSE3 ADC Results for VAUX PA8 . . . PA0 Direction Setting PA8 . . . PA0 Input/Output Data PA8 . . . PA0 Interrupt Enable PA8 . . . PA0 Interrupt Status PWM Period PWM Dead Time PWM Pulse Deletion Time PWM Gate Drive Configuration PWM Channel A Pulsewidth PWM Channel B Pulsewidth PWM Channel C Pulsewidth PWM Segment Select AUX PWM Output 0 AUX PWM Output 1 Auxiliary PWM Frequency Value Auxiliary PWM Frequency Value/Offset Reserved Mode Control Register System Status Interrupt Status Watchdog Timer Reserved PA8 . . . PA0 Mode Select Reserved PWMSYNC Pulsewidth PWM S/W Trip Bit Reserved ICONST_TRIM Sample Hold Timer 1 Sample Hold Timer 2 Sample Hold Timer 3 Reserved Flash Memory Control Register Flash Memory Address Register Flash Memory Data Register High Flash Memory Data Register Low Reserved
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ADMCF341
Table XIII. DSP Core Registers
Address (hex) 0x3FFF 0x3FFE 0x3FFD 0x3FFC 0x3FFB 0x3FFA 0x3FF9 0x3FF8 0x3FF7 0x3FF6 0x3FF5 0x3FF4 0x3FF3 0x3FF2 0x3FF1 0x3FF0 0x3FEF
Name SYSCNTL MEMWAIT TPERIOD TCOUNT TSCALE SPORT0_RX_WORDS1 SPORT0_RX_WORDS0 SPORT0_TX_WORDS1 SPORT0_TX_WORDS0 SPORT0_CTRL_REG SPORT0_SCLKDIV SPORT0_RFSDIV SPORT0_AUTOBUF_CTRL SPORT1_CTRL_REG SPORT1_SCLKDIV SPORT1_RFSDIV SPORT1_AUTOBUF_CTRL
Bits [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [7 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0] [15 . . . 0]
Function System Control Register Memory Wait State Control Register Interval Timer Period Register Interval Timer Count Register Interval Timer Scale Register SPORT0 Multichannel Word 1 Receive SPORT0 Multichannel Word 0 Receive SPORT0 Multichannel Word 1 Transmit SPORT0 Multichannel Word 0 Transmit SPORT0 Control Register SPORT0 Clock Divide Register SPORT0 Receive Frame Sync Divide SPORT0 Autobuffer Control Register SPORT1 Control Register SPORT1 Clock Divide Register SPORT1 Receive Frame Sync Divide SPORT1 Autobuffer Control Register
FLASH MEMORY CONTROL REGISTER 15 1 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 0x2080
BOOT
MEMORY
FLASH
CODE
FLASH MEMORY ADDRESS REGISTER 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 0x2081
RESERVED ALWAYS READ 0
ADDRESS 11
0
15 0
14 0
13 0
FLASH MEMORY DATA REGISTER LOW (FMDRL) 12 11 10 9 8 7 6 5 4 3 0 0 0 0 0 0 0 0 0 0
2 0
1 0
0 0 0x2083
RESERVED ALWAYS READ 0
STATUS 5
0
DATA 7
0
15 0
14 0
13 0
FLASH MEMORY DATA REGISTER HIGH (FMDRH) 12 11 10 9 8 7 6 5 4 3 0 0 0 0 0 0 0 0 0 0
2 0
1 0
0 0 0x2082
DATA 23
8
MOST SIGNIFICANT BIT IS ON THE LEFT. FOR EXAMPLE, DATA23 IS BIT 15 OF FMDRH.
Figure 22. Configuration of Flash Memory Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
REV. 0
-27-
ADMCF341
PWMTM (R/W) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DM (0x 2008)
PWMTM
PWMDT (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0
fPWM =
fCLKOUT
2 PWMTM
DM (0x2009)
PWMDT
TD = PWMSEG (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0
2
PWMTM
fCLKOUT
DM (0x200F)
A CHANNEL CROSSOVER 0 = NO CROSSOVER 1 = CROSSOVER B CHANNEL CROSSOVER C CHANNEL CROSSOVER
CH OUTPUT DISABLE CL OUTPUT DISABLE BH OUTPUT DISABLE BL OUTPUT DISABLE AH OUTPUT DISABLE AL OUTPUT DISABLE 0 = ENABLE 1 = DISABLE
PWMSYNCWT (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 1 4 0 3 0 2 1 1 1 0 1 DM (0x2060)
PWMSYNCWT
TPWMSYNC, ON = PWMSYNCWT + 1 PWMSWT (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2061)
fCLKOUT
Figure 23. Configuration of PWM Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
-28-
REV. 0
ADMCF341
PWMPD (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x200A)
PWMPD PWMPD TMIN =
fCLKOUT
PWMGATE (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x200B)
GDCLK GATE DRIVE CHOPPING FREQUENCY 0 = DISABLE 1 = ENABLE LOW SIDE GATE CHOPPING HIGH SIDE GATE CHOPPING
fCHOP =
fCLKOUT
4 (GDCLK + 1)
PWMCHA (R/W) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DM (0x200C)
PWM CHANNEL A DUTY CYCLE
PWMCHB (R/W) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DM (0x200D)
PWM CHANNEL B DUTY CYCLE
PWMCHC (R/W) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DM (0x200E)
PWM CHANNEL C DUTY CYCLE
Figure 24. Configuration of Additional PWM Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
REV. 0
-29-
ADMCF341
PORTA_DIR (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2004)
PA0-PA8
0 = INPUT 1 = OUTPUT
PORTA_DATA (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2005)
PA0-PA8
0 = LOW LEVEL 1 = HIGH LEVEL
PORTA_SELECT (R/W) 15 0 0 = CLOCKOUT 1 = AUX0 14 0 13 0 12 0 11 0 10 0 9 0 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 1 DM (0x2049)
0 = AUX0/CLOCKOUT 1 = PA8
0 = DR0 1 = PA0
0 = PWMSYNC 1 = AUX1
0 = AUX1/PWMSYNC 1 = PA7
0 = DT0 1 = PA1
0 = DR1 1 = PA6
0 = RFS0 1 = PA2
0 = DT1/FL1 1 = PA5
0 = TFS0 1 = PA3
0 = SCLK1/SCLK0 1 = PA4
Figure 25. Configuration of PIO Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
-30-
REV. 0
ADMCF341
PORTA_INTEN (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2006)
0 = INTERRUPT DISABLE 1 = INTERRUPT ENABLE
PORTA_FLAG (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2007) 0 = INTERRUPT DISABLE 1 = INTERRUPT ENABLE
Figure 26. Configuration of Additional PIO Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
AUXCH0 (R/W) 9 8 7 6 0 0 0 0
15 0
14 0
13 0
12 0
11 0
10 0
5 0
4 0
3 0
2 0
1 0
0 0 DM (0x2010)
TON, AUX0 = 2 AUXCH1 (R/W) 9 8 7 6 0 0 0 0
(AUXCH0)
tCK
15 0
14 0
13 0
12 0
11 0
10 0
5 0
4 0
3 0
2 0
1 0
0 0 DM (0x2011)
TON, AUX1 = 2 AUXTM0 (R/W) 15 1 14 1 13 1 12 1 11 1 10 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1
(AUXCH1)
tCK
1 1
0 1 DM (0x2012)
AUX0 PERIOD = 2 AUXTM1 (R/W) 8 7 6 1 1 1
(AUXTM0 + 1)
tCK
15 1
14 1
13 1
12 1
11 1
10 1
9 1
5 1
4 1
3 1
2 1
1 1
0 1 DM (0x2013)
AUX1 PERIOD = 2 (AUXTM1) OFFSET = 2 (AUXTM1) tCK
tCK
Figure 27. Configuration of Auxiliary PWM Register
Default bit values are shown; if no value is shown, the bit field is undefined at reset.
REV. 0
-31-
ADMCF341
15 14 13 12 11 10 9 ADC1 (R) 8 7 6 5 4 3 0 2 0 1 0 0 0 DM (0x2000) CONVERSION STATUS ADC2 (R) 8 7 0 = DATA READY 1 = NOT READY
15
14
13
12
11
10
9
6
5
4
3 0
2 0
1 0
0 0 DM (0x2001) CONVERSION STATUS 0 = DATA READY 1 = NOT READY
15
14
13
12
11
10
9
ADC3 (R) 8 7
6
5
4
3 0
2 0
1 0
0 0 DM (0x2002) CONVERSION STATUS 0 = DATA READY 1 = NOT READY
15
14
13
12
11
10
9
ADCAUX (R) 8 7 6
5
4
3 0
2 0
1 0
0 0 DM (0x2003)
15 0
14 0
13 0
12 0
11 0
10 0
ICONST_TRIM (R/W) 9 8 7 6 0 0 0 0
5 0
4 0
3 0
2 0
1 0
0 0 DM (0x2068)
ICONST MIN = BITS 0 - 2 CLEARED. ICONST MAX = BITS 0 - 2 SET.
SHA1_TM (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2069)
SHA2 _TM (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x206A)
SHA3 _TM (R/W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x206B)
Figure 28. Configuration of ADC Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
-32-
REV. 0
ADMCF341
MODECTRL (R/W)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0 DM (0x2015)
0 = SPORT MODE 1 = UART MODE
SPORT 0 MODE SELECT
ADC MUX CONTROL 00 VAUX0 01 VAUX1 10 VAUX2 11 VREF
PWMTRIP INTERRUPT 0 = DISABLE 1 = ENABLE
0 = SPORT 1 = SPI MODE
SPORT 0 SPI MODE
0 = STANDARD 1 = REVERSE
SPI CLOCK POLARITY
PWMSYNC INTERRUPT
0 = DISABLE 1 = ENABLE
0 = PHA0 1 = PHA1
SPI CLOCK PHASE
SPORT1 MODE SELECT
0 = BOOT MODE 1 = UART MODE
0 = ISENSE 1 = VOLTAGE
CHANNEL 3 SELECTION
ADC MUX CONTROL
NOT USED IN ADMCF341 SET BIT TO ZERO
0 = ISENSE 1 = VOLTAGE
CHANNEL 2 SELECTION
PWM UPDATE MODE SELECT
0 = SINGLE UPDATE MODE 1 = DOUBLE UPDATE MODE
0 = ISENSE 1 = VOLTAGE
CHANNEL 1 SELECTION
0 = OFFSET MODE 1 = INDEPENDENT MODE
AUX PWM MODE SELECT
0 = CLKIN RATE 1 = CLKOUT RATE
ADC COUNTER
SYSSTAT (R) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 3 2 1 0
0
1
DM (0x2016) PWMTRIP PIN STATUS
0 = LOW 1 = HIGH
0 = 1ST HALF OF PWM CYCLE 1 = 2ND HALF OF PWM CYCLE
PWM TIMER STATUS
WATCHDOG STATUS
0 = NORMAL 1 = WATCHDOG RESET OCCURRED
IRQFLAG (R) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0
DM (0x2017)
PWMTRIP INTERRUPT
PWMSYNC INTERRUPT
0 = NO INTERRUPT 1 = INTERRUPT OCCURRED
WDTIMER (W) 15 0 14 0 13 0 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 0 DM (0x2018)
Figure 29. Configuration of Status/Control Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
REV. 0 -33-
ADMCF341
4
0
3
0
ICNTL 2 1 0 1
0
1
DSP REGISTER
0 = DISABLE 1 = ENABLE
INTERRUPT NESTING
IRQ0 SENSITIVITY IRQ1 SENSITIVITY IRQ2 SENSITIVITY 0 = LEVEL 1 = EDGE
IFC
15
0
INTERRUPT FORCE
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
DSP REGISTER
INTERRUPT CLEAR
IRQ2
TIMER
SPORT0 TRANSMIT
SPORT1 RECEIVE OR IRQ0
SPORT0 RECEIVE
SPORT1 TRANSMIT OR IRQ1
SOFTWARE 1
SOFTWARE 0
SOFTWARE 0
SOFTWARE 1
SPORT1 TRANSMIT OR IRQ1
SPORT0 RECEIVE
SPORT1 RECEIVE OR IRQ0
SPORT0 TRANSMIT
TIMER
IRQ2
IMASK (R/W)
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
1
1
1
0
0 DSP REGISTER
PERIPHERAL (OR IRQ2)
TIMER SPORT1 RECEIVE (OR IRQ0)
SPORT0 TRANSMIT
0 = DISABLE (MASK) 1 = ENABLE
SPORT0 RECEIVE
SPORT1 TRANSMIT (OR IRQ1)
DISABLE 0= (MASK) 1 = ENABLE
SOFTWARE 1
SOFTWARE 0
Figure 30. Configuration of Interrupt Control Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
-34-
REV. 0
ADMCF341
15 0 0 = DISABLED 1 = DISABLED 0 = DISABLED 1 = ENABLED 14 0 13 0 12 0 11 0 10 1 SYSCNTL (R/W) 9 8 7 6 0 0 0 0 5 1 4 1 3 1 2 1 1 1 0 1 DM (0x3FFF)
SPORT0 ENABLE
SPORT1 CONFIGURE
0 = FI, FO, IRQ0, IRQ1, SCLK 1 = SERIAL PORT
SPORT1 ENABLE MEMWAIT (R/W) 15 1 14 1 13 1 12 1 11 1 10 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 1 DM (0x3FFE)
Figure 31. Configuration of Registers
Default bit values are shown; if no value is shown, the bit field is undefined at reset. Reserved bits are shown on a gray field--these bits should always be written as shown.
REV. 0
-35-
ADMCF341
OUTLINE DIMENSIONS
Dimensions shown in mm and (inches).
28-Lead Wide-Body SOIC (R-28)
18.10 (0.7125) 17.70 (0.6969)
28
15
7.60 (0.2992) 7.40 (0.2914)
1 14
10.65 (0.419) 10.00 (0.394)
PIN 1
2.65 (0.1043) 2.35 (0.0926)
0.75 (0.029) 0.25 (0.010)
45
0.30 (0.0118) 0.10 (0.0040)
1.27 (0.0500) BSC
0.51 (0.020) 0.33 (0.013)
8 0 SEATING 0.32 (0.0125) PLANE 0.23 (0.0091)
1.27 (0.0500) 0.40 (0.016)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
-36-
REV. 0
PRINTED IN U.S.A.
C02470-0-4/02(0)

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