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EM MICROELECTRONIC - MARIN SA
EM6680
Ultra Low Power 8-pin Microcontroller
Features
True Low Power: 4.0 A active mode 3.0 A standby mode 0.65 A sleep mode
@ 1.5V, 32kHz, 25C
Stable RC oscillator 32 - 128kHz Prescaler
Figure 1. Architecture
VDD VDD
Power Supply
ROM 1536 x 16Bit
RAM 80 x 4Bit
Low Supply Voltage 1.2 V to 3.6 V No external component needed Available in TSSOP-8/14, SO-8/14 packages and die 4-bit ADC or 12 levels Supply Voltage Level Detector (SVLD) Max 4 (5*) outputs with 2 high drive outputs of 10mA Max. 5 (6*) inputs Sleep Counter Reset (automatic wake-up from sleep mode (EM patent)) Mask ROM 1536 x 16 bits RAM 80 x 4 bits Internal RC oscillator 32 kHz - 800 kHz 2 clocks per instruction cycle 72 basic instructions External CPU clock source possible Watchdog timer (2 sec) Power-On-Reset with Power-Check on Start-Up 3 wire serial port , 8 bit, master and slave mode Universal 10-bit counter, PWM, event counter Prescaler down to 1 Hz (freq. = 32 kHz) Frequency output 1Hz, 2048 Hz, CpuClk, PWM 6 internal interrupt sources ( 2x10-bit counter, 2x prescaler, SVLD, Serial Interface) 2 external interrupt sources (port A)
Power on Reset Sleep Counter Reset Watchdog
10-Bit Univ Count/Timer
Core EM6600
4-bit ADC
Interrupt Controller SVLD check
Port A
Serial Interface
Reset PA2 PA3 PA4 *PA5
PA0
PA1
PA1 & PA2: high current drive outputs
* PA5 available only in 14-pin package and in die
Figure 2. Pin Configuration
PA0
1 2 3 4 8
VDD VREG PA4 (Reset,ADC) VSS
Description
The EM6680 is an ultra-low voltage, low power microcontroller coming in a package as small as 8-pin TSSOP and working up to 0.4 MIPS. It comes with an integrated 4-bit ADC and 2 high current drive outputs of 10mA and it requires no external component. It has a sleep counter reset allowing automatic wake-up from sleep mode. It is designed for use in battery-operated and fieldpowered applications requiring an extended lifetime. A high integration level make it an ideal choice for cost sensitive applications. The EM6680 contains the equivalent of 3kB mask ROM and a RC oscillator with frequencies between 32 and 800kHz selectable by metal option. It also has a poweron reset, watchdog timer, 10 bit up/down counter, PWM and several clock functions. Tools include windows-based simulator and emulator. A ROMless version is also available for validation in development stage (EMDK6680A).
TSSOP-8, SO-8
PA1 PA2 PA3
EM6680
7 6 5
NC PA0 PA1 PA2 PA3 NC NC
1 2 3 4 5 6 7
14 13 12
NC VDD VREG PA5 PA4 (Reset,ADC) VSS NC
TSSOP-14, SO-14
EM6680
11 10 9 8
Typical Applications
Household appliances Safety and security devices Automotive controls Sensor interfaces Watchdog Intelligent ADC Driver (LED, triac)
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EM6680
EM6680 at a glance
Power Supply
- Low voltage low power architecture including internal voltage regulator - 1.2 V to 3.6 V supply voltage - 4.0 A in active mode - 3.5 A in standby mode - 0.35 A in sleep mode @ 1.5V, 32kHz, 25C
4(5)-Bit I/O PA[3:0] & PA[4] / PA[5]*
- Direct input read on the port terminals - 2 Debounce function available muxed on 4 inputs - 2 Interrupt request on positive or negative edge - Pull-up or pull-down or none selectable by register, except PA[4] where pullup/down is mask selection - 2 Test variables (software) for conditional jumps - PA[1] and PA[3/4] are inputs for the event counter - PA[3/4] Reset input (register selectable) - All outputs can be put tri-state (default) - Selectable pull-downs in input mode - CMOS or Nch. open drain outputs - Weak pull-up selectable in Nch. open drain mode
RAM
- 80 x 4 bit, directly addressable
ROM
- 1536 x 16 bit (~3k Byte), metal mask programmable
CPU
- 4-bit RISC architecture - 2 clock cycles per instruction (CPI=2) - 72 basic instructions
4-bit ADC & Voltage Level Det. (SVLD)
- External voltage compare from PA[4] input possible (low resolution 4 bit AD converter) -12 different levels from 1.2 V to 3.0 V for SVLD - Used for Power Check after POR (1.25V or 1.85V) - Busy flag during measure - Interrupt generated if SVLD measurement low
Main Operating Modes and Resets
- Active mode (CPU is running) - Standby mode (CPU in halt, peripherals running) - Sleep mode (no clock, data kept) - Initial Power-On-Reset with Power-Check - Watchdog reset (logic) - Reset terminal (software option on PA[3/4]) - Sleep Counter reset from Sleep mode - Wakeup on change from Sleep mode
10-Bit Universal Counter
- 10, 8, 6 or 4 bit up/down counting - Parallel load - Event counting (PA[1] or PA[3/4]) - 8 different input clocks - Full 10 bit or limited (8, 6, 4 bit) compare function - 2 interrupt requests (on compare and on 0) - Hi-frequency input on PA[1] and PA[3/4] or CPUclk/2 - Pulse width modulation (PWM) output
Prescaler
- Divider (4 stages) to best fit CPU clock (32kHz - 1MHz to 32kHz system clock to keep peripherals timing close to specification - 15 stage system clock divider from 32kHz down to 1Hz - 2 Interrupt requests (3 different frequencies) - Prescaler reset (4kHz to 1Hz)
Interrupt Controller
- 2 external and 6 internal interrupt request sources - Each interrupt request can individually be masked - Each interrupt flag can individually be reset - Automatic reset of each interrupt request after read - General interrupt request to CPU can be disabled - Automatic enabling of general interrupt request flag when going into HALT mode
8-Bit Serial Interface
- 3 wire (Clock, DataIn , DataOut) master/slave mode - READY output during data transfer - Maximum shift clock is equal to the main system clock - Interrupt request to the CPU after 8 bit data transfer - Supports different serial formats - pins shared with general 4 bit PA[3:0] I/O port
Sleep Counter Reset (SCR)
- wake up the EM6680 from sleep mode - 4 timings selectable by register - Inhibit SCR by register
Oscillator
- RC Oscillator range: 32/50kHz to 500/800kHz (metal selectable from 32/50, 64/100, 128/200, 256/400 or 500/800 kHz typ. for CPU clock) - No external components are necessary - Temperature compensated - External clock source possible from PA[1]
Package form available
- TSSOP-8/14 - SO-8/14 - Die form (9 pin possible due to additional I/O pin)
NB: All frequencies written in this document are related to a typical system clock of 32 kHz !
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EM6680
Table of Contents
FEATURES______________________________ 1
1H
8.4
PULSE WIDTH MODULATION (PWM) _______ 28
47H
DESCRIPTION ___________________________ 1
2H
8.4.1 8.4.2
How the PWM Generator works._________429 PWM Characteristics__________________430
8H4 9H4 50H 51H
EM6680 AT A GLANCE ____________________ 2
3H
1. 2. 2.1 2.2 2.3 3. 4. 4.1 4.2 4.3 4.4 4.5 4.6 5. 5.1 5.2 5.3 6. 6.1 6.2
PIN DESCRIPTION FOR EM6680 _______ 4
4H
OPERATING MODES ________________ ACTIVE MODE_______________________ STANDBY (HALT) MODE _______________ SLEEP MODE _______________________ POWER SUPPLY____________________
5H 6H 7H 8H 9H 10H
5 5 5 5 6
8.5 COUNTER SETUP _____________________ 30 8.6 10-BIT COUNTER REGISTERS ____________ 31 9. SUPPLY VOLTAGE LEVEL DETECTOR / 4-BIT ADC ______________________________ 33
52H
10. ADC/SVLD COMPARATOR CHARACTERISTICS ______________________ 36
53H
11. 12. 12.1 13. 14. 15. 15.1
RAM _____________________________ 36
54H
RESET ____________________________ 7 POR WITH POWER-CHECK RESET_________ 8 INPUT PORT A RESET __________________ 9 DIGITAL WATCHDOG TIMER RESET ________ 9 SLEEP COUNTER RESET _______________ 10 WAKE-UP ON CHANGE ________________ 10 THE CPU STATE AFTER RESET __________ 10 OSCILLATOR AND PRESCALER _____ 11 RC OSCILLATOR OR EXTERNAL CLOCK_____ 11 SPECIAL 4 STAGE FREQUENCY DIVIDER ____ 12 PRESCALER ________________________ 12 INPUT AND OUTPUT PORT A ________ 14 INPUT / OUTPUT PORT OVERVIEW ________ 14 PORTA AS INPUT AND ITS MULTIPLEXING ___ 15
1H 12H 13H 14H 15H 16H 17H 18H 19H 20H 21H 2H 23H
INTERRUPT CONTROLLER __________ 37 INTERRUPT CONTROL REGISTERS _________ 38 PERIPHERAL MEMORY MAP _________ 39
5H 56H 57H
ACTIVE SUPPLY CURRENT TEST _____ 41
58H
MASK OPTIONS ____________________ 42 INPUT / OUTPUT PORTS ________________ 42
59H 60H
15.1.1 15.1.2 15.1.3 15.1.4 15.1.5 15.1.6 15.1.7
Port A Metal Options __________________642 RC oscillator Frequency Option _________643 Debouncer Frequency Option ___________643 Power-Check Level Option _____________643 ADC/SVLD Voltage Level #15___________643 Counter Update option ________________644 Voltage Regulator level ________________644
1H6 2H6 3H6 4H6 5H6 6H 7H6 68H
6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.2.7 6.2.8 6.2.9 6.2.10 6.2.11
Debouncer __________________________215 IRQ on Port A _______________________216 Pull-up/down ________________________216 Software test variables ________________217 Port A for 10-Bit Counter _______________217 Port A Wake-Up on change_____________217 Port A for Serial Interface ______________317 Port A for External Reset_______________317 Port PA[4] as Comparator Input _________317 Reset and Sleep on Port A _____________317 Port A Blocked Inputs _________________317
4H2 5H2 6H2 7H2 8H2 9H2 0H3 1H3 2H3 3H 4H3 35H
16. 16.1 16.2 16.3 16.4 17. 17.1 17.2 17.3 17.4 17.5 17.6 17.7 17.8 18. 18.1 18.2 19. 19.1 19.2
6.3 6.4 7. 7.1 7.2 7.3 8. 8.1 8.2 8.3
PORTA AS OUTPUT AND ITS MULTIPLEXING _ 18
CMOS / Nch. Open Drain Output ________318
6H3
6.3.1
PORT A REGISTERS___________________ SERIAL PORT _____________________ GENERAL FUNCTIONAL DESCRIPTION______ DETAILED FUNCTIONAL DESCRIPTION______
37H 38H 39H 40H 42H
19 21 22 22
1H4
7.2.1
Output Modes _______________________423
SERIAL INTERFACE REGISTERS __________ 25 10-BIT COUNTER __________________ 26 FULL AND LIMITED BIT COUNTING ________ 26 FREQUENCY SELECT AND UP/DOWN COUNTING427 EVENT COUNTING____________________ 28
43H 4H 5H4 46H
TEMP. AND VOLTAGE BEHAVIORS ___ 45 IDD CURRENT (TYPICAL) AND VREG FOR 2 THRESHOLDS AND 1/3 OF POSSIBLE CURRENT FOR VREG.___________________________ 45 PULL-DOWN RESISTANCE (TYPICAL) _______ 45 PULL-UP RESISTANCE (TYPICAL)__________ 45 OUTPUT CURRENTS (TYPICAL) ___________ 46 ELECTRICAL SPECIFICATION ________ 48 ABSOLUTE MAXIMUM RATINGS ___________ 48 HANDLING PROCEDURES _______________ 48 STANDARD OPERATING CONDITIONS _______ 48 DC CHARACTERISTICS - POWER SUPPLY ___ 49 SUPPLY VOLTAGE LEVEL DETECTOR _______ 51 DC CHARACTERISTICS - I/O PINS _________ 53 RC OSCILLATOR FREQUENCY ____________ 54 SLEEP COUNTER RESET - SCR __________ 55 PACKAGE DIMENSIONS _____________ 56 SO-8/14 ___________________________ 56 TSSOP-8/14 _______________________ 57 ORDERING INFORMATION ___________ 58 PACKAGE MARKING ___________________ 58 CUSTOMER MARKING __________________ 58
69H 70H 71H 72H 73H 74H 75H 76H 7H 78H 79H 80H 81H 82H 83H 84H 85H 86H 87H
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EM6680
1. Pin Description for EM6680
Table 1 EM6680 pin descriptions
# On Chip 1 2 3 4 5 6 7* 8 9 SO-8 1 2 3 4 5 6 NC 7 8 Signal Name PA0 PA1 PA2 PA3 Vss PA4 PA5 Vreg Vdd Description general I/O, serial In, Wake-Up on Change, IRQ source,... general I/O, serial CLK, timer source, external clock general I/O, serial Out, freq., CPU reset status output,... general I/O, serial Rdy/Cs, Interrupt source, Reset ground - negative supply pin general I, Reset, timer source, Interrupt source, Wake-Up, Compare I general I/O, freq, Wake-Up on Change, IRQ source regulated voltage supported by 100nF tw. Vss positive supply pin - capacitance tw. Vdd (C depends on Vdd noise)
Figure 3. Typical configuration for Vdd > 1.5V
Vdd Vdd Vreg
Voltage regulator
Vbat
C I/O pad
SVLD 4-bit ADC Level Shifter
uPUS 4bits core Digital peripherals RAM 64 x 4 bits ROM 1536 x 16 bits
Analog peripherals RC oscillator Power-on-Reset Sleep Reset Cnt
Vreg Capacitor 100nF
C
Vss
For Vdd > 1.5V
Typ_config_vdd+15.vsd
Figure 4. Typical configuration for Vdd < 1.5V
Vdd Vdd Regulated Voltage Vreg
Voltage regulator
Vbat
C I/O pad
SVLD 4-bit ADC Level Shifter
uPUS 4bits core Digital peripherals RAM 64 x 4 bits ROM 1536 x 16 bits
Analog peripherals RC oscillator Power-on-Reset Sleep Reset Cnt
Vreg Capacitor 100nF
C
Vss
For Vdd > 1.5V
Typ_config_vdd+15.vsd
NOTE: State of I/O pads may not be defined until Vreg reaches typ. 0.8V and Power-On-Reset logic supplied by Vreg clears them to Inputs. On I/O pins there are protective diodes towards Vdd and Vss.
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EM6680
2. Operating modes
The EM6680 can operate in three different modes of which 2 are low-power dissipation modes (Stand-By and Sleep). The modes and transitions between them are shown in Figure 5. 1.) Active mode 2.) Stand-By mode 3.) Sleep mode Figure 5. EM6680 operating mode transitions
START-UP RC oscilator running
POWER-ON
Power-On-Reset & Power Check Level POR static level Power-Check Active
PORwPC 8 oscillator periods PORwPC
RESET reset synchronizer and Power-Check
8 CPU clock periods
resetPortA WDreset
PORwPC
PORwPC
Reset-pad WDreset
ACTIVE or running mode
HALT instruction
interrupt/event
STAND-BY or HALT mode Clocks active
SleepResCnt WakeUp on Change
SLEEP
Everything stopped Registers and RAM keep their value
Sleep bit set
2.1 ACTIVE Mode
The active mode is the actual CPU running mode. Instructions are read from the internal ROM and executed by the CPU. Leaving the active mode: via the halt instruction to go into standby mode, writing the SLEEP bit to go into Sleep mode or detecting the reset to go into reset mode.
2.2 STANDBY (Halt) Mode
Executing a HALT instruction puts the EM6680 into standby mode. The voltage regulator, oscillator, watchdog timer, interrupts, timers and counters are operating. However, the CPU stops since the clock related to instruction execution stops. Registers, RAM and I/O pins retain their states prior to STANDBY mode. STANDBY is cancelled by a RESET or an Interrupt request if enabled.
2.3 SLEEP Mode
Writing to the Sleep bit in the RegSysCntl1 register puts the EM6680 in sleep mode. The oscillator stops and most functions of the EM6680 are inactive. To be able to write to the Sleep bit, the SleepEn bit in RegSysCntl2 must first be set to "1". In SLEEP mode only the voltage regulator is active to maintain the RAM data integrity, the peripheral functions are stopped and the CPU is reset. SLEEP mode may be cancelled by Wake/Up on change, external reset or by Sleep Reset Counter if any of them is enabled. Waking up from sleep mode may takes some time to guarantee stable oscillation. Coming back from sleep mode puts the EM6681 in reset state and as such reinitializes all registers to their reset value. Waking up from sleep mode clears the Sleep flag but not the SleepEn bit. Inspecting the SleepEn allows to determine if the EM6680 was powered up (SleepEn = "0") or woken from sleep mode (SleepEn = "1").
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EM6680
Table 2.3.1 Shows the Status of different EM6680 blocks in these three main operating modes. Peripheral /// EM6680 mode POR (static) Voltage regulator RC-oscillator Clocks (Prescaler & RC divider) CPU Peripheral register RAM Timer/Counter Supply Voltage Level Det.=SVLD PortA / Reset pad debounced Interrupts / events Watch-Dog timer Wake Up on Change PortA Sleep Reset Counter ACTIVE mode On On On On Running "On" "On" "On" can be activated Yes Yes - possible On / Off (soft selectable) No Off STAND-BY mode On On On On In HALT - Stopped "On" retain value retain value "On" if activated before "On" if activated before Yes Yes - possible On / Off (soft selectable) No Off SLEEP mode On On (Low-Power) Off Off Stopped retain value retain value stopped Off No No - not possible No On/Off (soft select.) On/Off (soft select.)
3. Power Supply
The EM6680 is supplied by a single external power supply between Vdd (VBAT) and VSS (ground). A built-in voltage regulator generates Vreg providing regulated voltage for the oscillator and the internal logic. The output drivers are supplied directly from the external supply VDD. Internal power configuration is shown in Figure 3 and Figure 4. To supply the internal core logic it is possible to use either the internal voltage regulator (Vreg < VDD) or directly ( Vreg = VDD). The selection is done by metal 1 mask option. By default the voltage regulator is used. Refer to chapter 0 for the metal mask selection.
8H
The internal voltage regulator is chosen for high voltage systems. It saves power by reducing the internal core logic's power supply to an optimum value. However, due to the inherent voltage drop over the regulator the minimal VDD value is restricted to 1.4V . A direct VDD connection can be selected for systems running on a 1.5V battery. The 1k resistor together with the external capacitor on Vreg is filtering the Vdd supply to the internal core. In this case the minimum VDD value can be as low as 1.2 V.
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EM6680
4. Reset
Figure 6. illustrates the reset structure of the EM6680. One can see that there are five possible reset sources :
(1) Internal initial Power On Reset (POR) circuitry with Power-Check. (2) External reset from PA[3/4] if software enabled (3) Internal reset from the Digital Watchdog. (4) Internal reset from the Sleep Counter Reset. (5) Wake-Up on change from PA[0/5] or PA[3/4] if software enabled. POR, ResetCold, System Reset, Reset CPU System Reset, Reset CPU System Reset, Reset CPU System Reset, Reset CPU System Reset, Reset CPU
Table 4.1 Reset sources that can be used in different Operating modes Reset Sources POR (static) with Power Check Software enabled reset on PA[3/4] Digital Watch-Dog Timer Sleep Counter Reset Wake Up on Change from Sleep Going in Sleep mode XS = software enable Figure 6. EM6680 Reset Structure
RESETs generation logic diagram
Ck[1] WDVal Write- Reset Read Statuts Watchdog times WDVa NoWDtim
SCRsel0 SCRsel1
ACTIVE mode Yes XS dig. debounce XS No No Yes
STAND-BY mode Yes XS dig. debounce XS No No No
SLEEP mode Yes XS analog debounce No XS XS No
Sleep Counter Reset Oscillator
typ . 100Hz
Prescaler
Write- Active Read Statuts
SleepEn
Sleep
Sleep
Internal Data Bus
resetCold
System Reset Delay
ResSys Peripherals & CPU
Analogue Filter
ck[15]
Wake up (on change)
Debounce POR & Power-check InResAH POR
ck[9]
Set PORstatus Reset Rd RegSysCntl1 PA[3/4]Resin All signals enter bottom, left, top and output on the right side of the boxes
PA[3] PA[4]
All reset sources activate the System Reset (ResSys). The `System Reset Delay' ensures that the system reset remains active long enough for all system functions to be reset (active for 12 system clock cycles. CPU is reset by the same reset As well as activating the system reset, the POR also resets all bits in registers marked `p' and the sleep enable (SleepEn) latch. System reset does not reset these register bits, nor the sleep enable latch.
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EM6680
4.1 POR with Power-Check Reset
POR and Power-Check are supervising the Vreg(digital) which follows more or less the Vdd supply voltage on start-up to guarantee proper operation after Power-On. The power check initiates a resetcold signal, which gets released when the Vdd supply voltage is high enough for the IC to function correctly. Figure 7. EM6680 resetcold signal as a result of Power-On-Reset and Power-Check
Vbat
Vreg
SVLD
Voltage Regulator
Bandgap Reference Vreg (digital) EN POR
resetcold To SYSTEM PORstatic
Static POR
2
Vbat, Vreg
6 3
Vbat Vreg
~1.25V SVLD lev5 SVLD lev4 ~1.2V
~1.0V POR level ~0.9V
1
4
5
7
time POR
resetcold
At power-on a POR cell with a static level of typ. 1.0V is checked. At time (1) in Figure 7. when the supply is increasing a power-check logic is switched-on with POR signal high. This logic enables the SVLD-level5 check which keeps resetcold active high until Vdd > SVLD-level5 (2). The circuit enters the active operating mode after (2), region (3). If afterwards Vdd drops below the selected SVLDlevel4 (4) low supply will be detected, but this does not generate a POR signal. Low supply will be detected only if the measurement is done at time (4). If Vreg drops below the static POR level of 0.90V when Vdd Supply is going down (POR static level has a hysteresys) then the POR and resetcold signals go high immediately (5) , SVLD level5 gets forced and power check is switched on. Because POR was done, the Vld_lev[3:0] was reset to value 0101, and Power-check makes resetcold inactive low again at time (6) where Vbat is above SVLD level 5. If there is only a very short Vdd drop (of few s), below the POR level, POR will not react because Vreg is supported by external capacitance and it drops slower than Vdd and the logic still works (7). IMPORTANT: special care should be taken, when Power Supply starts to fall close to or below Vdd min. Frequent checking of the SVLD level must be done. Below the minimum Vdd level specified, the circuit operation is not guaranteed. To distinguish between POR reset and all other types of reset, the PORstatus bit in RegSysCntl2 is set on at every POR and is cleared by writing the RegSysCntl1 register. With metal option SVLD level9 @ 1.85V can be selected at higher RC oscillator frequencies to guarantee proper operation at higher frequencies. Note: Low supply detection may be used to go in protected sleep mode. During sleep mode the circuit operation is stopped. Resuming from Sleep mode (Reset or Wake-up) will automatically perform a Power-Check . As such the systems will only resume to active mode if the Power-Check condition is full-filled. The SVLD level which was selected at the time one entered sleep mode will be used as Power-Check level (exception: if during Sleep one has a POR condition then the default SVLD level will be applied.)
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EM6680
4.2 Input Port A Reset
By writing the PA[3/4]ResIn in RegFreqRst registers the PA[3] or PA[4] input becomes dedicated for external reset. This bit is cleared by POR only. Which input is selected is set by IrqPA[3l/4h] bit from RegPACntl2 register which is described in Chapter 6. Bit InResAH in the RegFreqRst register selects the PA[3/4] reset function in Active and standby (Halt) mode. If set to `0' the PA[3/4] reset is inhibited. If Set to `1' than PA[3/4] input goes through a debouncer and needs to respect timing associated with the debounce clock selection made by DebSel bit in RegPresc register. This InResetAH bit has no action in sleep mode, where a Hi pulse on PA[3/4] always immediately triggers a system reset (only small analogue debouncer is attached to filter 1 or 2 s spikes).
89H
Overview of control bits and possible reset from PA[3] or PA[4] is specified in table 4.2.1 below. Table 4.2.1 Possible Reset from PA[3] or PA[4] ACTIVE or STAND-BY mode NO reset from PA[3] or PA[4] 0 X NO reset from PA[3] or PA[4] 1 0 Debounce reset with debck of 1 1 * Ck[14]/ Ck[11]/ Ck[8] needing 0.25 ms / 2 ms / 16ms Hi pulse typ. * Ck[14]/ Ck[11]/ Ck[8] are explained in chapter 5.2 Prescaler.
90H
PA[3/4]ResIn InResAH
SLEEP mode NO reset from PA[3] or PA[4] Reset with small analog filter Reset with small analog filter
4.3 Digital Watchdog Timer Reset
The Digital Watchdog is a simple, non-programmable, 2-bit timer, that counts on each rising edge of Ck[1]. It will generate a system reset if it is not periodically cleared. The watchdog timer function can be inhibited by activating an inhibit digital watchdog bit (NoWDtim) located in RegVLDCntl. At power up, and after any system reset, the watchdog timer is activated. If for any reason the CPU stops or stays in a loop where watchdog timer is not periodically cleared, it activates the system reset signal. This function can be used to detect program overrun, endless loops, etc. For normal operation, the watchdog timer must be reset periodically by software at least every 2.5 seconds (system clock = 32 KHz), or a system reset signal is generated. The watchdog timer is reset by writing a `1' to the WDReset bit in the timer. This resets the timer to zero and timer operation restarts immediately. When a `0' is written to WDReset there is no effect. The watchdog timer also operates in standby mode and thus, to avoid a system reset, standby should not be active for more than 2.5 seconds. From a System Reset state, the watchdog timer will become active after 3.5 seconds. However, if the watchdog timer is influenced from other sources (i.e. prescaler reset), then it could become active after just 2.5 seconds. It is therefore recommended to use the Prescaler IRQHz1 interrupt to periodically reset the watchdog every second. It is possible to read the current status of the watchdog timer in RegSysCntl2. After watchdog reset, the counting sequence is (on each rising edge of CK[1]) : `00', `01', `10', `11', {WDVal1 WDVal0}). When reaching the `11' state, the watchdog reset will be active within 1/2 second. The watchdog reset activates the system reset which in turn resets the watchdog. If the watchdog is inhibited it's timer is reset and therefore always reads `0'. Table 4.3.1 Watchdog timer register RegSysCntl2 Bit Name Reset R/W Description 3 WDReset 0 W Reset the Watchdog (The Read value is always '0') 1 Resets the Logic Watchdog 0 no action 2 SleepEn 0 R/W See Operating modes (sleep) 1 WDVal1 0 R Watchdog timer data 1/4 ck[1] 0 WDVal0 0 R Watchdog timer data 1/2 ck[1] 3 PORstatus 1 P* R Power-On-Reset status 1 P* POR sets the PORstatus bit which is cleared by writing register RegSysCntl1
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EM6680
4.4 Sleep Counter Reset
To profit the most from Low Power Sleep Mode and still supervise the circuit surrounding, one can enable the Sleep Counter Reset which only runs in Sleep mode and periodically wakes up the EM6680. Four (4) different Wake-Up periods are possible as seen in table below. Control bits SleepCntDis which is set to default `0'by POR enables the Sleep Counter when the circuit goes into Sleep mode. The SCRsel1, SCRsel0 bits that are used to determine Wake-Up period are in the RegSleepCR register. To disable the Sleep Counter in Sleep mode SleepCntDis must be set to `1'. Table 4.4.2 Register RegSleepCR Bit Name Reset 3 NoPullPA[4] 0 por 2 SleepCntDis 0 por 1 SCRsel1 0 por 0 SCRsel0 0 por R/W R/W R/W R/W R/W Description Remove pull-up/down from PA[4] input Disable Sleep Reset Counter when Hi Selection bit 1 for Sleep RCWake-Up period Selection bit 0 for Sleep RCWake-Up period
Table 4.4.3 Wake-Up period from Sleep selection SCRsel1 SCRsel0 Sleep Reset Counter periods 0 0 1.5 internal low speed RC clock periods 0 1 15.5 internal low speed RC clock periods 1 0 127.5 internal low speed RC clock periods 1 1 1023.5 internal low speed RC clock periods Refer to table 17.8 or the actual SCR timeout period timings
91H
Sleep Counter Reset (SCR) uses the same prescaler (see chapter 5.3) as the System Clock in Active and StandBy mode. Prescaler reset is made automatically just before going into Sleep mode if SCR is enable. This causes the Sleep Reset Counter to have its specified period.
4.5 Wake-Up on Change
By writing the WUchEn[0/5] and/or WUchEn[3/4] bit in RegPaCntl2 registers the PA[0] or PA[5] and/or PA[3] or PA[4] can generate a reset from sleep on any polaritychange on a selected pin. The port selection is defined with bits IrqPA[0l/5h] and IrqPA[3l/4h]. See also chapter 6 and Figure 10 for more details.
4.6 The CPU State after Reset
Reset initializes the CPU as shown in Table 4.6.1 below.
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Table 4.6.1 Initial CPU value after Reset. Name Bits Program counter 0 12 Program counter 1 12 Program counter 2 12 Stack pointer 2 Index register 7 Carry flag 1 Zero flag 1 Halt 1 Instruction register 16 Periphery registers 4
Symbol PC0 PC1 PC2 SP IX CY Z HALT IR Reg.....
Initial Value $000 (as a result of Jump 0) Undefined Undefined SP[0] selected Undefined Undefined Undefined 0 Jump 0 See peripheral memory map
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5. Oscillator and Prescaler 5.1 RC Oscillator or external Clock
EM6680 can use the internal RC oscillator or external clock source for its operation. The built-in RC oscillator without external components generates the system operating clock for the CPU and peripheral blocks. The RC oscillator is supplied by the regulated voltage. The RC oscillator frequency can be chosen from 5 possibilities with a metal option with 2 basic frequencies. These are typically 32kHz, 64kHz, 128kHz, 256kHz or 500kHz for 32kHz basic frequency or 50kHz, 100kHz, 200kHz, 400kHz or 800kHz for 50kHz basic frequency . Depending on the selected RC frequency. A special 4 stage freq. divider is available to be able to deliver to Prescaler which generates all System clock except CPU clock, a frequency close to 32 or 50 kHz to keep the peripheral timing as close as possible to specifications. Please note that Vddmin must be higher when working with higher frequencies - contact EM for details. After POR the circuit always starts with the internal RC oscillator, but it can be switched to the external clock by setting the ExtCPUclkON bit in the register RegPresc. The external clock is input at PA[1] and must be in range from min. 10Khz to max. 1MHz. With this external frequency input all timing for peripherals change and the special 4 stage freq. divider must be adapted to best suit the applied external frequency to keep 32/50kHz System clock as close as possible. The system clock must be less than 64kHz. The external clock source must be a square wave with full amplitude from Vss to Vdd. See Table 5.2.2 for advised special divisions depending on the external clock frequency. Switching from internal RC oscillator to External clock or back from External clock to RC oscillator is made without generating a glitch on the internal clock. Once the circuit is running on the external Clock one can disable the RC oscillator by setting the RCoscOff bit in RegSCntl2 to `1'. In sleep mode the oscillator is stopped. It can be stopped also by setting the RCoscOff bit. This bit can be set only if ExtCPUClkOn was set before, indicating that the CPUck was switched from the internal RC oscillator to the external clock which MUST be present. If the External Clock stops without going into Sleep mode first the EM6680 can block and only POR can reset it. Figure 8. below shows the connection of the RC oscillator and external clock and generation of CPUclk and System clock = SysClk which is divided by the special 4 stage Freq. Divider if needed as described in 5.2 and prescaler described in 5.3.
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Figure 8. Clock source for CPU or system peripherals
RC oscillator 32kHz - 512kHz 50kHz - 800kHz metal option selection External clock 10kHz - 800kHz ExtCPUclkON
div16
RCClk
0 MUX CPUclk Frequency divider div2 div4 div1 div8
PA[1]
1
PAout[5] MUX foutSel[1:0] PA[5]
Automatic clock selection SysClk = 32kHz or 50kHz depending on selected RCClk selection
MUX CpuClk SysClk Ck[12] Ck[1] Sout PAout[2] ResSys Ck[14] MUX PA[2]
MUX
To Peripherals Ck[15:1]
SysClk
PRESCALER LOW 15 stages divider Ck[15:1]
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5.2 Special 4 stage Frequency Divider
If an internal RC clock or external frequency higher than 32 kHz or 50 kHz is selected, then the special 4 stage Frequency Divider must be used to select a frequency close to 32 kHz or 50 kHz for the SysClk - system clock used by the Prescaler. This is done by metal option. If the external clock will be used, the same metal option used to select the division for SysClk. Table below shows recommended divisions in this 4 stage divider. Table 5.2.1 PA[1] I/O status depending on its RegPACntl3 and RegPa0OE registers
Ext. clock 10 kHz - 50 kHz 55 kHz - 100 kHz 110 kHz - 200 kHz 220 kHz - 400 kHz 400 kHz - 1 MHz RC frequency (1)base (2) base 32 64 128 256 500 50 100 200 400 800 RC frequency or External freq. MUST be divided by No Division to SysClk Divided by 2 Divided by 4 Divided by 8 Divided by 16 Typical Obtained SysClk Min.- typ. If RC - Max. [kHz] 10 - 32 - 50 27.5 27.5 27.5 10 - - - - 32 32 32 32 - - - - 50 50 50 62.5
5.3 Prescaler
The prescaler consists of a fifteen element divider chain which delivers clock signals for the peripheral circuits such as timer/counter, debouncer and edge detectors, as well as generating prescaler interrupts. The input to the prescaler is the system clock signal closest to 32 kHz or 50 kHz which comes from the RC oscillator or external clock as divided by the preceding divider. Power on initializes the prescaler to Hex(0001). Table 5.3.1 Prescaler Clock Name Definition
Function System clock System clock / 2 System clock / 4 System clock / 8 System clock/ 16 System clock / 32 System clock / 64 System clock / 128 Name Ck[16] Ck[15] Ck[14] Ck[13] Ck[12] Ck[11] Ck[10] ck [9] 32 KHz SysClk 32768 Hz 16384 Hz 8192 Hz 4096 Hz 2048 Hz 1024 Hz 512 Hz 256 Hz 50 KHz SysClk 50000 Hz 25000 Hz 12500 Hz 6250 Hz 3125 Hz 1562 Hz 781 Hz 390 Hz Function System clock / 256 System clock / 512 System clock / 1024 System clock / 2048 System clock / 4096 System clock / 8192 System clock / 16384 System clock / 32768 Name Ck[8] Ck[7] Ck[6] Ck[5] Ck[4] Ck[3] Ck[2] Ck[1] 32 KHz SysClk 128 Hz 64 Hz 32 Hz 16 Hz 8 Hz 4 Hz 2 Hz 1 Hz 50 KHz SysClk 195 Hz 97 Hz 49 Hz 24 Hz 12 Hz 6 Hz 3 Hz 1.5 Hz
Figure 9. Prescaler Frequency Timing
Prescaler Reset SysClk = System clock Ck[16]
Ck[15] Ck[14] Ck[13] Horizontal Scale change Ck[2] Ck[1]
First positive edge of 1 Hz clock Ck[1] is 1 sec after the falling reset edge
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Table 5.3.2 Control of Prescaler Register RegPresc
Bit 3 2 1 0 Name ExtCPUclkON ResPresc PrIntSel DebSel Reset p 0 0 0 R/W R/W R/W R/W R/W Description Ext. Clock selection instead of RC oscillator for CPUClk. Write Reset prescaler 1 Reset the divider chain from Ck[14] to Ck[2], sets Ck[1]. 0 No action. The Read value is always '0' Prescaler Interrupt select. 0 Interrupt from Ck[4] (typ. 8/12 Hz) 1 Interrupt from Ck[7] (typ. 64/97 Hz) Debounce clock select. 0 Debouncer with Ck[8] 1 Debouncer with Ck[11] or Ck[14]
p* reset to `0' by POR only. With DebSel = 1 one may choose either the Ck[11] or Ck[14] debouncer frequency by selecting the corresponding metal mask option. Relative to 32kHz the corresponding max. debouncer times are then 2 ms or 0.25 ms. For the metal mask selection refer to chapter 15.1.3
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Switching the PrIntSel may generate an interrupt request. Avoid it with MaskIRQ64/8 = 0 selection during the switching operation. The prescaler contains 2 interrupt sources: - IRQ64/8 ; this is Ck[7] or Ck[4] positive edge interrupt, the selection is depending on bit PrIntSel. - IRQHz1 ; this is Ck[1] positive edge interrupt There is no interrupt generation on reset. The first IRQHz1 Interrupt occurs typically. 1 sec (if SysClk = 32kHz) after reset. (0.65 sec if SysClk is 50kHz).
NOTE: If not written explicitly all timing in peripherals is calculated for 32 kHz System Clock !
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6. Input and Output port A
The EM6680 has: - one 4-bit input/output port ( port A[3:0] ) - one 1 bit input port. ( port PA[4] ) - one optional 1 bit input/output ( port PA[5] ) available in die form or 14 pin package. Pull-up and Pull-down resistors can be added to all these ports with metal and/or register options.
6.1 Input / Output Port Overview
Table 6.1.1 Input and Output port overview
Pin n in 8 pin package General I/O Serial interface WakeUp on change Softw. pullUp/Down Metal option pullUp/Down Timer input Irq debounce & active edge selection. CPU soft. variable input Analogue compare Input External reset input External CPU clock input PWM timer out freq. Output (CpuClk, SysClk, 2kHz, 1Hz) CPU reset condition PA[0] 1 I/O Sin I yes* I yes --yes* I yes* I ---yes O --PA[1] 2 I/O Sclk I/O -yes -yes I ----yes I yes O --PA[2] 3 I/O Sout O -yes --------yes* O yes O PA[3] 4 I/O Rdy/CS O yes* I yes -yes* I yes* I yes* I -yes* I ----PA[4] 6 I -yes* I yes yes yes* I yes* I yes* I yes I yes* I ----PA[5]* NC* I/O -yes* I yes --yes* I yes* I ----yes* O --
NC* - Pad PA[5] is Not Connected in 8-pin package, available only in die form
Yes* ;
The function is software selectable on one of PA[0], IrqPA[0l/5h] and IrqPA[3l/4h] settings.
PA[5] or PA[3], PA[4], depending on the
As shown in Figure 10, Logic for the Wake up on change reset which is possible only from Sleep mode, Debouce and IRQ function on Rising or falling edge are implemented only twice but can be attached and configured by registers to 4 different pads when used as inputs. Ports PA[0] and PA[5] can be configured to have wakeup on Change, and debounced or non-debounced IRQ on the falling or rising edge. The same function is available on ports PA[3] or PA[4] which in addition can be dedicated to input reset . Registers RegPACntl1 and RegPACntl2 make this selection. Table 6.1.2 Register RegPACntl1 Bit 3 2 1 0 Name POR R/W Description DebounceNoPA[3/4] 0 R/W Debouncer on when Low for PA[3/4] input DebounceNoPA[0/5] 0 R/W Debouncer on when Low for PA[0/5] input EdgeFallingPA[3/4] 0 R/W IRQ edge selector for interrupt from PA[3/4] input EdgeFallingPA[0/5] 0 R/W IRQ edge selector for interrupt from PA[0/5] input * Default is debouncer On and Rising edge for IRQ Name POR R/W Description WUchEnPA[3/4] 0 R/W WakeUp on change EN on PA[3] or PA[4] WUchEnPA[0/5] 0 R/W WakeUp on change EN on PA[0] or PA[5] IrqPA[3l/4h] 0 R/W PA[3] if Low / PA[4] if High for IRQ source IrqPA[0l/5h] 0 R/W PA[0] if Low / PA[5] if High for IRQ source * Default: No wake Up on change and IRQ source, or reset and timer input, would be PA[3], PA[0]
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Table 6.1.3 Register RegPACntl2 Bit 3 2 1 0
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6.2 PortA as Input and its Multiplexing
The EM6680 can have up to 5 (6* in Die form or 14 pin package) 1-bit general purpose CMOS input ports. The port A input can be read at any time, pull-up or pull-down resistors can be chosen by software and metal options for PA[3:0] and PA[5] if available. PA[4] has only metal option pull-up or pull-down resistor. Figure 10 explains how the inputs are treated with control signals and how they are distributed to different peripherals and the CPU. This is also listed in Table 6.1.1 Input and Output ports overview. Figure 10. EM6680 Multiplexed Inputs diagram
PA[4] extVcheck PA[1]
Qdeb Qdeb Input to peripherals is blocked if used for SVLD comparator input
extVcheck
to SVLD Logic
TimCk0 TimCk7
I0 Z QB QB Z I1 S
to Timer / Event Counter
CkDeb Debounce PA[0] PA[5]
irqPA[0l/5h] Sleep RdRegPA0 PA[3:0] RdRegPA1 PA[5:4] I0
Q Q
PA[1] PA[0]
Serial Clock Input to Serial Interface Serial Data Input
debouncerYesPA[0/5] WakeUp on change In Out
EdgeFallingPA[0/5] uPVar[1] to CPU uPVar[2] WUchEnPA[0/5] Internal Data Bus DB [3:0]
I1 S
CkDeb Debounce PA[3] PA[4]
irqPA[3l/4h] I0 Z I1 S
Qdeb Q I0 Z QB I1 S
IRQPA[0/5] IRQPA[3/4]
to Interrupt Logic
debouncerYesPA[3/4]
EdgeFallingPA[3/4]
Sleep
WakeUp on change In Out WUchEnPA[3/4] Small Analogue Filter In Out
InResAH
WakeUp on Change
to Reset Logic PA3/4_reset ResFlt
ResDis PA3/4resln
All signals enter bottom, left, top and output on the right side of the boxes
EM6680_fig10.vsd
Some Input functions are explained below.
6.2.1 Debouncer
The debouncer is clocked with one of the possible debounce clocks (Ck[11] / Ck[8] and can be used only in Active or StandBy mode (as only in these two modes clocks are running). The input signal has to be stable on two successive debouncer rising clock edges and must not change between them. The debouncer clock Ck[11] can be replaced with Ck[14] by metal option, refer to 15.1.3 .
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Figure 11. Debouncer function
DEBOUNCER function (signal must be stable during two Deb Clk rising edges)
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6.2.2 IRQ on Port A
For interrupt request generation (IRQ) one can choose direct or debounced input and rising or falling edge IRQ triggering. With the debouncer selected debounceYesPA[x/y], the input must be stable for two rising edges of the selected debouncer clock CkDeb. This means a worst case of 16ms(default) or 2ms (0.25ms by metal mask) with a system clock of 32kHz. Either a rising or falling edge on the port A inputs - with or without debouncing - can generate an interrupt request. This selection is done by edgeFallingPA[x/y]. PortA can generate max 2 different interrupt requests. Each has its own interrupt mask bit in the RegIRQMask1 register. When an IRQ occurs, inspection of the RegIRQ1 and RegIRQ2 registers allow the interrupt to be identified and treated. At power on or after any reset the RegIRQMask1 is set to 0, thus disabling any input interrupt. A new interrupt is only stored with the next active edge after the corresponding interrupt mask is cleared. See also the interrupt chapter 9. It is recommended to mask the port A IRQ's while one changes the selected IRQ edge. Otherwise one may generate an unwanted IRQ (Software IRQ). I.e. if a bit PA[0/5] is `0' then changing from positive to negative edge selection on PA[0/5] will immediately trigger an IRQPA[0/5] if the IRQ was not masked.
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6.2.3 Pull-up/down
On Each terminal of PA[3:0] and PA[5] an internal pull-up (metal mask MAPU[n]) and pull-down (metal mask MAPD[n]) resistor can be connected per metal mask option. By default the two resistors are in place. In this case one can choose by software to have either a pull-up, a pull-down or no resistor. See below for better understanding. With the mask option in place, the default pull value is Pull-Down (initialized by POR). Once the software up and running this may be changed to pull-up if needed. If the port is used also as output please check Chapter 6.3.1 CMOS / Nch. Open Drain Output. PA[4] can have only strong Pull-up or Pull-down resistor. This resistor can be disconnected by software in register RegSleepCR bit NoPullPA[4]. For Metal mask selection and available resistor values refer to chapter 15.
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Pull-down ON: MAPD[n] must be in place , AND bit NoPdPA[n] must be `0' .
with n=0, 1, 2, 3, 5
Pull-down OFF: MAPD[n] is not in place, OR if MAPD[n] is in place NoPdPA[n] = `1' cuts off the pull-down. OR selecting NchOpDrPA[n] = `1' cuts off the pull-down. Pull-up ON : MAPU[n] must be in place, AND bit NchOpDrPA[n] must be `1' , AND (bit OEnPA[n] = `0' (input mode) OR if OEnPA[n] = `1' while PAData[n] = 1. ) MAPU[n] is not in place, OR if MAPU[n] is in place NchOpDrPA[n] = `0' cuts off the pull-up, OR if MAPU[n] is in place and if NchOpDrPA[n] = `1' then PAData[n] = 0 cuts off the pull-up.
Pull-up OFF :
Never pull-up and pull-down can be active at the same time. Any port A input must never be left open (high impedance state, not connected, etc. ) unless the internal pull resistor is in place (mask option) and switched on (register selection). Any open input may draw a significant cross current which adds to the total chip consumption. Note: The mask settings MAPU[n]) and MAPD[n] do not define the default pull direction, but the pull possibilities. It is the software which defines the pull direction (pull-up or pull-down). The only exception is on PA[4] where the user must decide if he wants pull-up or pull-down. For this input the selected pull direction will always be valid unless the software disconnects the pull resistor.
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6.2.4 Software test variables
As shown in Figure 10 PA[0/5] or PA[3/4] are also used as input conditions for conditional software branches. These CPU inputs are always debounced and non-inverted. * debounced PA[0/5] is connected to CPU TestVar1 * debounced PA[3/4] is connected to CPU TestVar2 CPU TestVar3 is connected to VSS and can not be used in Software.
6.2.5 Port A for 10-Bit Counter
The PA[1] and PA[3/4] inputs can be used as the clock input terminal for the 10 bit counter. * PA[1] is at counter clock selection 0. The input is direct ( no debouncer is possible * PA[3/4] is at counter clock selection 7. As for the IRQ generation, debounced or input directly and non-inverted or inverted input is possible. This is defined with the register RegPaCntl1. Debouncing the input is always recommended.
6.2.6 Port A Wake-Up on change
In sleep mode if configured port PA[0/5] or PA[3/4] inputs are continuously monitored to wake up on change, which will immediately wake up the EM6680.
6.2.7 Port A for Serial Interface
When the serial interface is used in slave mode, PA[0] is used for serial data input and PA[1] for the serial clock.
6.2.8 Port A for External Reset
In Active and Stand-by (Halt) mode a positive debounced pulse on PA[3/4] can be the source of a reset when PA[3/4]ResIn and InResAH are set at `1'. When IrqPA[3l/4h] is `0' than PA[3] is selected for Reset source and when IrqPA[3l/4h] is `1' than PA[4] is selected for Reset source.
6.2.9 Port PA[4] as Comparator Input
When using the PA[4] as an input to the internal SVLD comparator NO pull resistor should be connected on this terminal. Otherwise the device may draw excessive current. First PA[4] pull-up/down resistor should be disconnected by software and the ExtVcheck bit can be set to `1'. This dedicates PA[4] as SVLD resistor divider input to the SVLD comparator. At this point the measurements respect the same timing as any other SVLD measurements as explained in Chapter Supply Voltage Detector. It can also generate an IRQ if the input voltage is lower as Comparator level. Thus configured a direct read of PA[4] will result in reading `0'.
6.2.10 Reset and Sleep on Port A
During circuit initialisation, all Control registers are reset by Power On Reset and therefore all pull-ups are off and all pull-downs are on. During Sleep mode, the circuit is in Reset State. However the Reset State does not reset the Control registers, RAM and pull-downs, if previously turned on. After any reset the serial interface parameters are reset to : Slave mode, Start and Status = 0, LSB first, negative edge shift , PA[3:0] tri-state.
6.2.11 Port A Blocked Inputs
In sleep mode if PortA inputs are not used and prepared for Wake-Up on Change or Reset these inputs are blocked. At that time port can be undefined from external and this will not generate an over-consumption. PA[0] PA[1] PA[2] PA[3] PA[4] PA[5] : Blocked if Sleep bit set and no IRQ or Wake-up defined on this input : Blocked if Sleep bit set : Blocked if Sleep bit set : Blocked if Sleep bit set and no IRQ or Wake-up defined on this input : Blocked if Sleep bit set and no IRQ or Wake-up defined on this input Also blocked if External VLD check enabled : Never blocked
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6.3 PortA as Output and its Multiplexing
The EM6680 can have up to 4 (5 in Die form or 14-pin package) bit general purpose CMOS or N-channel Open Drain Output ports. Table 6.1.1 Input and Output ports overview shows all the possibilities. Figure 12 shows the output architecture and possible output signals together with software controlled pull-up and pull-down resistors which are disconnected when the port is an output and in a defined state, to preclude additional consumption. The output multiplexing registers are RegPACntl3 and RegPACntl4. Figure 12. Port A Architecture (Outputs)
Pull-down Register (NoPdPA[n]) Pd[n]
Open Drain Control Register (NchOpPA[n]) OD[n] Vdd
Output Enable Register (OEnPA[n]) OE[n] Port A Input / Output Control Logic Port A Data Register (PAout[n]) out[n] Output Mux Registers mux[n] PA[5,3:0] Vdd
Active Pull-up in Nch. Open Drain Mode Metal Option MAPu[n]
Internal DATA Bus
Metal Option MAPd[n] Multiplexed Outputs from: - Serial Interface - PWM, frequency out. - System Reset Active Pull-down Read Port A
Block Input (Low) To Irq, Reset, Clock, etc
6.3.1 CMOS / Nch. Open Drain Output
The port A outputs can be configured as either CMOS or Nch. open drain outputs. In CMOS both logic `1' and `0' are driven out on the terminal. In Nch. Open Drain only the logic `0' is driven on the terminal, the logic `1' value is defined by the internal pull-up resistor (if implemented), or high impedance. Figure 13. CMOS or Nch. Open Drain Outputs
CMOS Output Nchannel Open Drain Output
Vdd
Active Pull-up for High State Daout[n] Mux Other Outputs Out Mux Control Tri-State Output Buffer is Closed PA[5,3:0] I/O Terminal Other Outputs Out Mux Control Daout[n] Mux Tri-State Output Buffer : High Impedance for Data = `1' I/O Terminal PA[5,3:0]
NOTE: State of I/O pads may not be defined until Vreg reaches typ. 0.8V and Power-On-Reset logic supplied by Vreg clears them to Inputs. This time depends on how fast capacitor on Vreg is charged and typ. it can be in range of couple of ms.
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6.4 Port A registers
The two Control registers for Input control, RegPACntl1 and RegPACntl2, were already shown in chapter 6; Input / Output Ports Overview. Table 6.4.1 Register RegPA0
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Name Reset PAData[3] 0 PAData[2] 0 PAData[1] 0 PAData[0] 0 * Direct read on Port A terminals Table 6.4.2 Register RegPa0OE Bit 3 2 1 0
Bit 3 2 1 0
R/W R* /W R* /W R* /W R* /W
Description PA[3] input and PAout[3] output PA[2] input and PAout[2] output PA[1] input and PAout[1] output PA[0] input and PAout[0] output
Name Reset R/W Description OEnPA[3] 0 R/W I/O control for PA[3] , output when OEnPA[3] = Hi OEnPA[2] R/W I/O control for PA[2] , output when OEnPA[2] = Hi 0 P** OEnPA[1] 0 R/W I/O control for PA[1] , output when OEnPA[1] = Hi OEnPA[0] 0 R/W I/O control for PA[0] , output when OEnPA[0] = Hi ** On POR PA[2] is output (OEnPA[2]='1') until System reset is finished to output Reset condition. After Reset is finished and circuit starts to execute instructions PA[2] becomes tri-state input. Table 6.4.3 Register Pa0noPDown Bit Name POR* R/W Description 3 NoPdPA[3] 0 R/W No pull-down on PA[3] 2 NoPdPA[2] 0 R/W No pull-down on PA[2] 1 NoPdPA[1] 0 R/W No pull-down on PA[1] 0 NoPdPA[0] 0 R/W No pull-down on PA[0] POR* Reset only with Power On Reset Table 6.4.4 Register Pa0NchOpenDr Bit 3 2 1 0 Name POR* R/W Description NchOpDrPA[3] 0 R/W Nch. Open Drain on PA[3] NchOpDrPA[2] 0 R/W Nch. Open Drain on PA[2] NchOpDrPA[1] 0 R/W Nch. Open Drain on PA[1] NchOpDrPA[0] 0 R/W Nch. Open Drain on PA[0] * Reset only with Power On Reset, Default "0" is: CMOS on PA[3..0] Name Reset R/W Description NchOpDrPA[5] p** R* /W Nch. Open Drain on PA[5] OEnPA[5] 0 R* /W I/O control for PA[5] , output when OEnPA[5] = Hi PAData[5] 0 R* /W PA[5] input and PAout[5] output PAData[4]* 0 R* PA[4] input * Direct read on Port A terminals p** reset to `0' by POR only Name InResAH PA3/4resIn foutSel[1] foutSel[0] POR p p x x R/W R/W R/W R/W R/W Description Input reset On in Active and StandBy mode PA3/4 dedicated for Input reset when set at `1' Output Frequency selection (foutSel[1:0]) (11) CPUclk, (10) SysClk, (01) 2kHz, (00) 1Hz
Table 6.4.5 Register RegPA1 Bit 3 2 1 0
Table 6.4.6 Register RegFreqRst Bit 3 2 1 0
Interrupt PortA Control bits MaskIRQPA[0/5] and MaskIRQPA[3/4] used to enable (Mask) the Interrupt ReQuest IRQ from PortA are in register RegIRQMask1. Interrupt status bits IRQPA[0/5] and IRQPA[3/4] used to signal the Interrupt from PortA are in register RegIRQ1. They are both shown in Chapter Interrupt Controller.
Note: CPUClk = RCClk if no external clock used.
In case of external clock, CPUClk is equal to the PA[1] input clock.
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Output multiplexing registers are shown below. Table 6.4.7 Register RegPACntl3 Bit Name POR R/W 3 SerialStPA[3] 0 R/W 2 SerialCkPA[1] 0 R/W 1 PWMoutPA[1] 0 R/W 0 PWMoutPA[0] 0 R/W Table 6.4.8 Register RegPACntl4 Bit Name POR R/W 3 NoPdPA[5] 0 R/W 2 freqOutPA[5] 0 R/W 1 Sout/rstPA[2] 1 R/W 0 freqOutPA[2] 1 R/W Description Output selection for PA[3] when output Output selection for PA[1] when output Output selection for PA[1] when output Output selection for PA[0] when output Description No pull-down on PA[5] Output selection for PA[5] when output Output selection for PA[2] when output Output selection for PA[2] when output
Table 6.4.9 PA[0] I/O status depending on its RegPACntl3 and RegPa0OE registers OEnPA[0] PWMoutPA[0] Description of PA[0] terminal Input 0 X PAout[0] general Output 1 0 PWM Output from the 10-Bit Counter 1 1 Table 6.4.10 PA[1] I/O status depending on its RegPACntl3 and RegPa0OE registers OEnPA[1] SerialCkPA[1] PWMoutPA[1] Description of PA[1] terminal Input 0 X X PAout[1] general Output 1 0 0 PWM Output from the 10-Bit Counter 1 0 1 Sclk (Serial interface clock output) 1 1 X Table 6.4.11 PA[2] I/O status depending on its RegPACntl4 and RegPa0OE registers OEnPA[2] Sout/rstPA[2] freqOutPA[2] Description of PA[2] terminal 0 X X Input 1 0 0 PAout[2] general Output 1 0 1 Freq. Output (CPUClk, SysClk, 2kHz, 1Hz) 1 1 0 Sout (Serial interface data output) High level `1' during Reset state output 1 1 1 8kHz frequency output while out of reset state Low level `0' output during sleep 0 PA[0] = `1' Output: high level during Reset state 1 1 PA[4] = `1' Input: out of reset state and during sleep PA[1] = `0' Frequency output is selected in 6.4.6 Register RegFreqRst Table 6.4.12 PA[3] I/O status depending on its RegPACntl3 and RegPa0OE registers OEnPA[3] SerialStPA[3] Description of PA[3] terminal Input 0 X PAout[3] general Output 1 0 Rdy/CS (Serial interface status output) 1 1 Table 6.4.13 PA[5] I/O status depending on its RegPACntl4 and RegPA1 registers OEnPA[5] freqOutPA[5] Description of PA[5] terminal Input 0 X PAout[5] general Output 1 0 Freq. Output (CPUClk, SysClk, 2kHz, 1Hz) 1 1 Frequency output is selected in 6.4.6 Register RegFreqRst Note: CPUClk = RCClk if no external clock used. In case of external clock, CPUClk is equal to the PA[1] input clock.
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7. Serial Port
The EM6680 contains a simple, half duplex three wire synchronous type serial interface., which can be used to program or read an external EEPROM, ADC, ... etc. Its I/O are multiplexed on Port A. For data reception, a shift-register converts the serial input data on the SIN(PA[0]) terminal to a parallel format, which is subsequently read by the CPU in registers RegSDataL and RegSDataH for low and high nibble. To transmit data, the CPU loads data into the shift register, which then serializes it on the SOUT(PA[2]) terminal. It is possible for the shift register to simultaneously shift data out on the SOUT terminal and shift data in on the SIN terminal. In Master mode, the shifting clock is supplied internally by the Prescaler : one of three prescaler frequencies are available, Ck[16], Ck[15] or Ck[14]. In Slave mode, the shifting clock is supplied externally on the SCLKIn(PA[1]) terminal. In either mode, it is possible to program : the shifting edge, shift MSB first or LSB first and direct shift output. All these selection are done in register RegSCntl1 and RegSCntl2. Figure 14. Serial Interface Architecture
Serial Master Clock Output SCLKout to SCLK PA[1] 8-bit Shift Register Mux External Slave Clock Source (SCLKin from SCLK PA[1] Clock Enable
Shift Ck Write Tx Read Tx Shift complete (8th Shift Clock)
Internal Master Clock Source (ck[16,15,14])
Serial Input Data from SIN PA[0]
Serial Output Data to SOUT PA[2] IRQSerial
Internal DATA bus
Mode Control & Status Registers
Start Status Direct MSB;LSB Shift First Status ResetStart
Status to CS/Ready PA[3]
Control Logic
The PA[3..0] terminal configuration is shown in Figure 10 and 12. When the Serial Interface is used then care should be taken not to use inputs and outputs needed for Serial Interface for other peripherals !: PA[0] {SIN} must be dedicated to Serial input if needed and can not be used for IRQ, Software Variable jumps or Output. It can be still used for Wake-Up on Change PA[1] {SCLK} is an output for Master mode {SCLKOut} and an input for Slave mode {SCLKIn}. But different functions can be Switched On/Off with care as they are needed. PA[2] {SOUT} must be dedicated to Serial Data Output if needed and can not be used for Analogue input, or other Output. PA[3] {CS / Ready } if used for serial Interface status output. When used for Serial Interface it should not be used for IRQ, Software Variable jumps or Output. It can be still used for Wake-Up on Change. Note: Before using the serial interface, the corresponding circuit terminals must be configured accordingly.
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7.1 General Functional Description
After power on or after any reset the serial interface is in serial slave mode with Start and Status set to 0, LSB first, negative shift edge and all outputs are in high impedance state. When the Start bit is set, the shift operation is enabled and the serial interface is ready to transmit or receive data, eight shift operations are performed: 8 serial data values are read from the data input terminal into the shift register and the previous loaded 8-bits are send out via the data output terminal. After the eight shift operation, an interrupt is generated, and the Start bit is reset. Parallel to serial conversion procedure ( master mode example ). Setup the circuit IO's accordingly. Write to RegSCntl1 serial control (clock freq. in master mode, edge and MSB/LSB select). Write to RegSDataL and RegSDataH (shift out data values). Write to RegSCntl2 (Start=1, mode select, status). Starts the shift out After the eighth clock an interrupt is generated, Start becomes low. Then, interrupt handling Serial to parallel conversion procedure (slave mode example). Setup the circuit IO's accordingly. Write to RegSCntl1 (slave mode, edge and MSB/LSB select). Write to RegSCntl2 (Start=1, mode select, status). After eight serial clocks an interrupt is generated, Start becomes low. Interrupt handling. Shift register RegSDataL and RegSDataH read. A new shift operation can be authorized.
7.2 Detailed Functional Description
Master or Slave mode is selected in the control register RegSCntl1. In Slave mode, the serial clock comes from an external device and is input via the PA[1] terminal as a synchronous clock (SCLKIn) to the serial interface. The serial clock is ignored as long as the Start bit is not set. After setting Start, only the eight following active edges of the serial clock input PA[1] are used to shift the serial data in and out. After eight serial clock edges the Start bit is reset. The PA[3] terminal is a copy of the (Start OR Status) bit values, it can be used to indicate to the external master, that the interface is ready to operate or it can be used as a chip select signal in case of an external slave. In Master mode, the synchronous serial clock is generated internally from the system clock. The frequency is selected from one out of three sources ( MS0 and MS1 bits in RegSCntl1) . The serial shifting clock is only generated during Start = high and is output to the SCLK terminal as the Master Clock (SCLKOut). When Start is low, the serial clock output on PA[1] is 0. An interrupt request IRQSerial is generated after the eight shift operations are done. This signal is set by the last negative edge of the serial interface clock on PA[1] (master or slave mode) and is reset to 0 by the next write of Start or by any reset. This interrupt can be masked with register RegIRQMask2. For more details about the interrupt handling see chapter 11. Serial data input on PA[0] is sampled by the positive or negative serial shifting clock edge, as selected by the Control Register POSnNeg bit. Serial data input is shifted in LSB first or MSB first, as selected by the Control Register MSBnLSB bit.
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7.2.1 Output Modes
Serial data output is given out in two different ways. Refer also to Figures 15 and 16. Figure 15. Direct or Re-Synchronized Output
Direct Shift Out
Re-Synchronised Shift Out
* OM[0] = 0 : The serial output data is generated with the selected shift register clock (POSnNeg). The first data bit is available directly after the Start bit is set. * OM[0] = 1 : The serial output data is re-synchronized by the positive serial interface clock edge, independent of the selected clock shifting edge. The first data bit is available on the first positive serial interface clock edge after Start=`1'. Table 7.2.1 Output Mode Selection in RegSCntl2 OM[0] 0 1 Output mode Serial-Direct Serial-Synchronized Description Direct shift pos. or neg. edge data out Re-synchronized positive edge data shift out
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Figure 16. Shift Operation and IRQ Generation
Note : A write operation in the control registers or in the data registers while Start is high will change internal values and may cause an error condition. The user must take care of the serial interface status before writing internal registers. In order to read the correct values on the data registers, the shift operation must be halted during the read accesses. Figure 17. Example of Basic Serial Port Connections
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7.3 Serial Interface Registers
Table 7.3.1 Register RegSCntl1 Bit 3 2 1 0 Name Reset R/W Description MS1 0 R/W Frequency selection MS0 0 R/W Frequency selection POSnNeg 0 R/W Positive or negative clock edge selection for shift operation MSBnLSB 0 R/W Shift MSB or LSB value first (0=LSB first) Default "0" is: Slave mode external clock, negative edge, LSB first
Table 7.3.2 Frequency and Master Slave Mode Selection MS1 MS0 Description Slave mode: Clock from external 0 0 Master mode Ck[14]: System clock / 4 0 1 Master mode Ck[15]: System clock / 2 1 0 Master modeCk[16]: System clock 1 1
Table 7.3.3 Register RegSCntl2 Bit 3 2 1 0 Description Enabling the interface, Ready or Chip Select output on PA[3] RC oscill. disable when set @ `1' if ExtCPUclkOn is `1' `0': Direct shift Output, `1': Output resynchronized Default "0" is: Interface disabled, status 0, direct shift output. Name Start Status RCoscOff OM[0] Reset 0 0 0 0 R/W R/W R/W R/W R/W
Table 7.3.4 Register RegSDataL Bit 3 2 1 0 Name Reset SerDataL[3] 0 SerDataL[2] 0 SerDataL[1] 0 SerDataL[0] 0 Default "0" is: Data equal 0. R/W R/W R/W R/W R/W Description Serial data low nibble Serial data low nibble Serial data low nibble Serial data low nibble
Table 7.3.5 Register RegSDataH Bit 3 2 1 0 Name Reset SerDataH[3] 0 SerDataH[2] 0 SerDataH[1] 0 SerDataH[0] 0 Default "0" is: Data equal 0. R/W R/W R/W R/W R/W Description Serial data high nibble Serial data high nibble Serial data high nibble Serial data high nibble
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8. 10-bit Counter
The EM6680 has a built-in universal cyclic counter. It can be configured as 10, 8, 6 or 4-bit counter. If 10-bits are selected we call that full bit counting, if 8, 6 or 4-bits are selected we call that limited bit counting. The counter works in up- or down count mode. Eight clocks can be used as the input clock source, six of them are prescaler frequencies and two are coming from the input pads PA[1] (direct only) and PA[3/4] (direct or debounced). In this case the counter can be used as an event counter. The counter generates an interrupt request IRQCount0 every time it reaches 0 in down count mode or 3FF in up count mode. Another interrupt request IRQCntComp is generated in compare mode whenever the counter value matches the compare data register value. Each of this interrupt requests can be masked (default). See section 9 for more information about the interrupt handling. A 10-bit data register CReg[9:0] is used to initialize the counter at a specific value (load into Count[9:0]). This data register (CReg[9:0]) is also used to compare its value against Count[9:0] for equivalence. A Pulse-Width-Modulation signal (PWM) can be generated and output on port A terminal PA[0] or PA[1].
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Figure 18. 10-bit Counter Block Diagram
Comparator
Up / Down Counter
Data Registers Control Registers
8.1 Full and Limited Bit Counting
In Full Bit Counting mode the counter uses its maximum of 10-bits length (default ). With the BitSel[1,0] bits in register RegCDataH one can lower the counter length, for IRQ generation, to 8, 6 or 4 bits. This means that actually the counter always uses all the 10-bits, but IRQCount0 generation is only performed on the number of selected bits. The unused counter bits may or may not be taken into account for the IRQComp generation depending on bit SelIntFull. Refer to chapter 8.4. Table 8.1.1. Counter length selection BitSel[1] BitSel[0 ] 0 0 0 1 1 0 1 1 counter length 10-Bit 8-Bit 6-Bit 4-Bit
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8.2 Frequency Select and Up/Down Counting
Eight (8) different input clocks can be selected to drive the Counter. The selection is done with bits CountFSel2...0 in register RegCCntl1. Six (6) of this input clocks are coming from the prescaler. The maximum prescaler clock frequency for the counter is half the system clock SysClk and the lowest is 1Hz typ. Therefore a complete counter roll over can take as much as 17.07 minutes (1Hz clock, 10 bit length) or as little as 977 s (Ck[15] typ 16.3kHz, 4 bit length). The IRQCount0, generated at each roll over, can be used for time bases, measurements length definitions, input polling, wake up from Halt mode, etc. The IRQCount0 and IRQComp are generated with the system clock Ck[16] rising edge. IRQCount0 condition in up count mode is : reaching 3FF if 10-bit counter length (or FF, 3F, F in 8, 6, 4-bit counter length). In down count mode the condition is reaching `0'. The non-selected bits are `don't care'. For IRQComp refer to section 8.4. Note: The Prescaler and the Microprocessor clock's are usually non-synchronous, therefore time bases generated are max. n, min. n-1 clock cycles long (n being the selected counter start value in count down mode). However the prescaler clock can be synchronized with P commands using for instance the prescaler reset function. Figure 19. Counter Clock Timing
Prescaler Frequencies or Debounced Port A Clocks System Clock Prescaler Clock Counting Counter IRQ's
Non Debounced Port A Clocks (System Clock Independent) System Clock Port A Clock Divided Clock Counting Counter IRQ's
The two remaining clock sources are coming from the PA[1] or PA[3/4] terminals. Refer to Figure 10 on page 15 for details. Input PA[1] can be only direct non-debounce input, second PA[3/4] can be either debounce (Ck[11] or Ck[8]) or direct input, the input polarity can also be chosen. The outputs for Timer clock inputs are named TimCk0 and TimCk7 respectively. For the debouncer and input polarity selection refer to chapter 6. In the case of port A input clock without debouncer, the counting clock frequency will be half the input clock on port A. The counter advances on every odd numbered port A negative edge ( divided clock is high level ). IRQCount0 and IRQComp will be generated on the rising PA[3/4] or PA[1] input clock edge. In this condition the EM6680 is able to count with a higher clock rate as the internal system clock (Hi-Frequency Input). Maximum port A input frequency is limited to 500kHz (@Vdd 1.5 V). If higher frequencies are needed, please contact EM Microelectronic's. In both, up or down count (default) mode, the counter is cyclic. The counting direction is chosen in register RegCCntl1 bit Up/Down (default `0' is down count). The counter increases or decreases its value with each positive clock edge of the selected input clock source. Start up synchronization is necessary because one can not always know the clock status when enabling the counter. With EvCount=0, the counter will only start on the next positive clock edge after a previously latched negative edge, while the Start bit was already set to `1'. This synchronization is done differently if event count mode (bit EvCount) is chosen. Refer also to Figure 20. Internal Clock Synchronization.
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8.3 Event Counting
The counter can be used in a special event count mode where a certain number of events (clocks) on the PA[1] (only non-debounced and only rising edge) or PA[3/4] input are counted. In this mode the counting will start directly on the next active clock edge on the selected port A input. Figure 20. Internal Clock Synchronization
Ck Start
Count[9:0] +/-1
Ck Start
Count[9:0] +/-1
Ck Start
Count[9:0]
Ck Start
Count[9:0] +/-1
EvCount = 0
EvCount = 0
EvCount = 1
EvCount = 1
The Event Count mode is switched on by setting bit EvCount in the register RegCCntl2 to `1'. PA[3] or PA[4] input depending on IrqPA[3l/4h] bit in RegPaCntl1 can be inverted depending on edgeFallingPA[3/4] in register RegPaCntl1 and should be debounced. The debouncer is switched on with debounceNoPA[3/4] at `0' in the same register. Its frequency depends on the bit DebSel from register RegPresc setting. Refer also to Figure 10 for PortA Inputs Function. As already said for other PA[1] input only possibility is to count rising nondebounced edges. A previously loaded register value (CReg[9:0]) can be compared against the actual counter value (Count[9:0]). If the two are matching (equality) then an interrupt (IRQComp) is generated. The compare function is switched on with the bit EnComp in the register RegCCntl2. With EnComp = 0 no IRQComp is generated. Starting the counter with the same value as the compare register is possible, no IRQ is generated on start. Full or Limited bit compare are possible, defined by bit SelIntFull in register RegSysCntl1. EnComp must be written after a load operation (Load = 1). Every load operation resets the bit EnComp. Full bit compare function. Bit SelIntFull is set to `1'. The function behaves as described above independent of the selected counter length. Limited bit counting together with full bit compare can be used to generate a certain amount of IRQCount0 interrupts until the counter generates the IRQComp interrupt. With PWMOn=`1' the counter would have automatically stopped after the IRQComp, with PWMOn=`0' it will continue until the software stops it. EnComp must be cleared before setting SelIntFull and before starting the counter again. Be careful, PWMoutPA[0] also redefines the port PA[0] or PWMoutPA[1] the PA[1] output data. (refer to section 0). The signal PWMOn is acombination of PWMOutPA[0], PWMOutPA[1], SerialCkPA[1]
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PWMOn = (PWMOutPA[0] OR PWMOutPA[1]) AND NOT(SeriaCktPA[1])) Limited bit compare With the bit SelIntFull set to `0' (default) the compare function will only take as many bits into account as defined by the counter length selection BitSel[1:0] (see chapter 6.3).
8.4 Pulse Width Modulation (PWM)
The PWM generator uses the behavior of the Compare function (see above) so EnComp must be set to activate the PWM function.. At each Roll Over or Compare Match the PWM state - which is output on port PA[0] or PA[1] - will toggle. The start value on PA[0] or PA[1] is forced while EnComp is 0 the value is depending on the up or down count mode. Every counter value load operation resets the bit EnComp and therefore the PWM start value is reinstalled. One can output PWM signal to PA[0] or PA[1]. Setting PWMoutPA[0] to `1' in register RegPaCntl3 routes the counter PWM output to PA[0]. Insure that PA[0] is set to output mode. Setting PWMoutPA[1] to `1' in register RegPaCntl3 routes the counter PWM output to PA[1]. Insure that PA[1] is set to output mode. Refer to section 6.3 and 6.4 for the port A output setup.
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The PWM signal generation is independent of the limited or full bit compare selection bit SelIntFull. However if SelIntFull = 1 (FULL) and the counter compare function is limited to lower than 10 bits one can generate a predefined number of output pulses. In this case, the number of output pulses is defined by the value of the unused counter bits. It will count from the start value until the IRQComp match. One must not use a compare value of hex 0 in up count mode nor a value of hex 3FF (or FF,3F, F if limited bit compare) in down count mode. For instance, loading the counter in up count mode with hex 000 and the comparator with hex C52 which will be identified as : - bits[11:10] are limiting the counter to limits to 4 bits length, =03 - bits [9:4] are the unused counter bits = hex 05 (bin 000101), - bits [3:0] (comparator value = 2). (BitSel[1,0]) (number of PWM pulses) (length of PWM pulse)
Thus after 5 PWM-pulses of 2 clocks cycles length the Counter generates an IRQComp and stops. The same example with SelIntFull=0 (limited bit compare) will produce an unlimited number of PWM at a length of 2 clock cycles.
8.4.1 How the PWM Generator works.
For Up Count Mode; Setting the counter in up count and PWM mode the PA[0] or PA[1] PWM output is defined to be 0 (EnComp=0 forces the PWM output to 0 in upcount mode, 1 in downcount). Each Roll Over will set the output to `1' and each Compare Match will set it back to `0'. The Compare Match for PWM always only works on the defined counter length. This, independent of the SelIntFull setting which is valid only for the IRQ generation. Refer also to the compare setup in chapter 0.
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In above example the PWM starts counting up on hex 0, 2 cycles later compare match PWM to `0', 14 cycles later roll over PWM to `1' 2 cycles later compare match PWM to `0' , etc. until the completion of the 5 pulses. The normal IRQ generation remains on during PWM output. If no IRQ's are wanted, the corresponding masks need to be set. Figure 21. PWM Output in Up Count Mode
Clock Count[9 :0] 03E Roll-over Compare IRQCount0 IRQComp PWM output 03F 000 001 ... Data-1 Data Data+1 Data+2
Figure 22. PWM Output in Down Count Mode
Clock Count[9 :0] 001 Roll-over Compare IRQCount0 IRQComp PWM output 000 3FF 3FE ... Data+1 Data Data-1 Data-2
In Down Count Mode everything is inverted. The PWM output starts with the `1' value. Each Roll Over will set the output to `0' and each Compare Match will set it back to `1'. Due to this positive pulse length is always longer by 1 selected clock period compared to written value. Example: for 25% positive pulse duty cycle on 4 bit counter one must write 3 in counter instead of 4. For limited pulse generation one must load the complementary pulse number value. I.e. for 5 pulses counting on 4 bits load bits[9 :4] with hex 3A (bin 111010).
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8.4.2 PWM Characteristics
PWM resolution is : 10bits (1024 steps), 8bits (256 steps), 6bits (64 steps) or 4 bits (16 steps) the minimal signal period is : 16 (4-bit) x Fmax* 16 x 1/Ck[15] 977 s (32 KHz) the maximum signal period is : 1024 x Fmin* 1024 x 1/Ck[1] 1024 s (32 KHz) the minimal pulse width is : 1 bit 1 x 1/Ck[15] 61 s (32 KHz) * This values are for Fmax or Fmin derived from the internal system clock (32kHz). Much shorter (and longer) PWM pulses can be achieved by using the port A as frequency input. One must not use a compare value of hex 0 in up count mode nor a value of hex 3FF (or FF,3F, F if limited bit compare) in down-count mode.
8.5 Counter Setup
RegCDataL[3:0], RegCDataM[3:0], RegCDataH[1:0] are used to store the initial count value called CReg[9:0] which is written into the count register bits Count[9:0] when writing the bit Load to `1' in RegCCntl2. This bit is automatically reset thereafter. The counter value Count[9:0] can be read out at any time, except when using non-debounced high frequency port A input clock. To maintain data integrity the lower nibble Count[3:0] must always be read first. The ShCount[9:4] values are shadow registers to the counter. To keep the data integrity during a counter read operation (3 reads), the counter values [9:4] are copied into these registers with the read of the count[3:0] register. If using non-debounced high frequency port A input the counter must be stopped while reading the Count[3:0] value to maintain the data integrity. In down count mode an interrupt request IRQCount0 is generated when the counter reaches 0. In up count mode, an interrupt request is generated when the counter reaches 3FF (or FF,3F,F if limited bit counting). Never an interrupt request is generated by loading a value into the counter register. When the counter is programmed from up into down mode or vice versa, the counter value Count[9:0] gets inverted. As a consequence, the initial value of the counter must be programmed after the Up/Down selection. Loading the counter with hex 000 is equivalent to writing stop mode, the Start bit is reset, no interrupt request is generated. How to use the counter; If PWM output is required one has to decide first on which PA port to put it. After corresponding port Output Enable OEnPA[n] must be set PWMoutPA[n] = 1 in step 5. ( n= 0 or 1) 1st, set the counter into stop mode (Start=0). 2nd, select the frequency and up- or down count mode in RegCCntl1. 3rd, write the data registers RegCDataL, RegCDataM, RegCDataH (counter start value and length) 4th, load the counter, Load=1, and choose the mode. (EvCount, EnComp=0) 5th, select bits PWMoutPA[n] in RegPaCntl3 and SelIntFull in RegSysCntl1 6th, if compare mode desired , then write RegCDataL, RegCDataM, RegCDataH (compare value) 7th, set bit Start and select EnComp in RegCCntl2.
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8.6 10-bit Counter Registers
Table 8.6.1. Register RegCCntl1 Bit 3 2 1 0 Name Reset R/W Up/Down 0 R/W CountFSel2 0 R/W CountFSel1 0 R/W CountFsel0 0 R/W Default : PA0 ,selected as input clock, Down counting Description Up or down counting Input clock selection Input clock selection Input clock selection
Table 8.6.2. Counter Input Frequency Selection with CountFSel[2..0] CountFSel2 CountFSel1 0 0 0 0 1 0 1 0 0 1 0 1 1 1 1 1 Table 8.6.3. Register RegCCntl2 Bit 3 2 1 0 CountFSel0 0 1 0 1 0 1 0 1 clock source selection Port A PA[1] = non debounced only TimCk0 Prescaler Ck[15] typ. 16 kHz Prescaler Ck[12] typ. 2 kHz Prescaler Ck[10] typ. 512 Hz Prescaler Ck[8] typ. 128 Hz Prescaler Ck[4] typ. 8 Hz Prescaler Ck[1] typ. 1 Hz Port A PA[3/4]
Name Reset R/W Description Start 0 R/W Start/Stop control EvCount 0 R/W Event counter enable EnComp 0 R/W Enable comparator Load 0 R/W Write: load counter register; Read: always 0 Default : Stop, no event count, no comparator, no load Table 8.6.4. System Control register RegSysCntl1 Bit Name Reset R/W Description 3 IntEn 0 R/W General interrupt enable 2 Sleep 0 R/W Sleep mode 1 SetIntFull 0 R/W Compare Interrupt select (note 1) 0 ChTmDis p 0* R/W Disable Test modes by setting it to 1 (MUST be DONE) p 0* ChTmDis is cleared on POR to be able to enter test modes at EM. Note: At program start the user must write the ChTmDis bit to `1' to prevent from accidentally going into factory test mode. Setting this bit to `1' must be done after a minimum number of instructions, see table 8.6.5 below. Additionally the Port PA0 must not be declared as output before the same number of cycles are passed. These precautions are necessary to guarantee proper factory circuit testing. ChTmDis bit needs to be reconfirmed (write `1' ) at every access to register RegSysCntl1 Table 8.6.5. Number of instructions before cutting Test access Min Nb. of instructions before ChTmDis is CPU frequency set or PortPA[0] declared as an output Basic frequency (32 kHz or 50 kHz) 4 Basic f. x 2 ( 64 kHz or 100 kHz) 8 Basic f. x 4 ( 128 kHz) 16 By writing to RegSysCntl1 - setting ChTmDis to 1 PORstatus will be cleared. Test mode is totally disabled also if PortPA[0] is declared as an output. OenPA[0] = `1' (note 1) Default : Interrupt on limited bit compare for Counter
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Table 8.6.6. Register RegCDataL, Counter/Compare Low Data Nibble Bit 3 2 1 0 3 2 1 0 Name CReg[3] CReg[2] CReg[1] CReg[0] Count[3] Count[2] Count[1] Count[0] Reset 0 0 0 0 0 0 0 0 R/W W W W W R R R R Description Counter data bit 3 Counter data bit 2 Counter data bit 1 Counter data bit 0 Data register bit 3 Data register bit 2 Data register bit 1 Data register bit 0
Table 8.6.7. Register RegCDataM, Counter/Compare Middle Data Nibble Bit 3 2 1 0 3 2 1 0 Name CReg[7] CReg[6] CReg[5] CReg[4] ShCount[7] ShCount[6] ShCount[5] ShCount[4] Reset 0 0 0 0 0 0 0 0 R/W W W W W R R R R Description Counter data bit 7 Counter data bit 6 Counter data bit 5 Counter data bit 4 Data register bit 7 Data register bit 6 Data register bit 5 Data register bit 4
Table 8.6.8. Register RegCDataH, Counter/Compare High Data Nibble Bit 3 2 1 0 1 0 Name BitSel[1] BitSel[0] CReg[9] CReg[8] ShCount[9] ShCount[8] Reset 0 0 0 0 0 0 R/W R/W R/W W W R R Description Bit select for limited bit count/compare Bit select for limited bit count/compare Counter data bit 9 Counter data bit 8 Data register bit 9 Data register bit 8
Table 8.6.9. Counter Length Selection BitSel[1] BitSel[0 ] 0 0 0 1 1 0 1 1
counter length 10-Bit 8-Bit 6-Bit 4-Bit
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9. Supply Voltage Level Detector / 4-bit ADC
The EM6680 has a built-in circuitry made up of a comparator with band-gap reference and a resistor divider chain with 16 terminals to detect levels from 0.5V to 2.75V with a step of 150mV. This can be used as: a. Supply Voltage Level Detector (SVLD) to compare the positive power supply level Vdd against levels which are in the range of Vddmin to Vddmax. There are 12 pre-selected levels in the range from 1.2 to 2.75V. In this case ExtVcheck must be cleared to `0' (default). b. Simple 4-bit Analogue to Digital Converter - ADC. Setting the ExtVcheck bit to `1' makes the PA[4] input an analog ADC input. PA[4] input voltage must not exceed VDD + 0.3V In Sleep mode both functions are disabled. Figure 23. SVLD / 4-bit ADC schematic with controls and timing
Supply Voltage Level Detector & 4-bit ADC function
SVLD level5 (1.25V) or SVLD level9 (1.85V) is used during Power On Reset for Power-Check to check the minimum operating voltage before the POR signal is released as described in Chapter 4.1. When used as a SVLD the ExtVCheck bit in register RegVldCntl must be cleared to `0'. Then Vdd is selected as the input to the resistive divider which provides the comparator inputs. The SVLD level must be selected by writing the RegSVLDlev register. For proper operation only levels from #4 to #15 can be selected. Then the CPU activates the voltage comparison by writing the VLDstart bit to `1' in the register RegVLDCntl. The actual measurement starts on the next ck[14] (08kHz @ 32kHz SysClk) falling edge and lasts typ. 260 us. The busy flag VldBusy stays high from the time VLDStart is set to `1' until the measurement is finished. The worst case time until the result is available is 3.125 * ck[14] prescaler clock periods (32kHz 382us). See figure 24 for details. During the actual measurement (typ. 260us) the device will draw typically an additional 4A of IVDD current @ Vdd=1.5V. After the end of the measurement an interrupt request IRQSvld can be generated if Vdd is lower than the level which was selected. The interrupt is generated only if the MaskIRQSvld bit is set to `1'. The result is available by inspection of the bit VLDResult. If the result is '0', then the power supply voltage was lower than the detection level value. If `1' the power supply voltage was higher than the detection level value. The value of VLDResult is not guaranteed while VldBusy=1. An interrupt can be generated only if Vdd is lower than the selected level. IRQSvld bit is cleared by reading RegIRQ2.
H0
Table 9.1 register RegVldCntl Bit 3 3 2 2 1 0 Name Reset R/W Description ExtVcheck 0 W PA[4] as positive input of divider chain VLDResult 0 R* VLD result flag VLDStart 0 W VLD start command VLDBusy 0 R VLD busy flag is on Until compare is finished SVLDen 0 R/W SVLD comparator is On continuously NoWDtim p R/W No watchdog timer R*; VLDResult is not guaranteed while VLDBusy=1
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Figure 24. SVLD timing
The VLDresult bit from the previous measurement stays in the register until the new measurements is finished. For good measurements external noise or CPU activity should be as low as possible during the comparison. Table 9.2 register RegSVLDlev
Bit 3 2 1 0 Name SVLDlev[3] SVLDlev[2] SVLDlev[1] SVLDlev[0] POR 0* 1* 0 1 R/W R/W R/W R/W R/W Description SVLD level select bit #3 SVLD level select bit #2 SVLD level select bit #1 SVLD level select bit #0
SVLDlev[3:2] depends on Metal option for Power-Check level Table 9.3 SVLD level selection (typical values VSVLDNom)
SVLDlev[3:0] MSB 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 LSB 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Nb.: Level # 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ADC SVLD Description of specialitis Do not use this level with SVLD Do not use this level with SVLD Do not use this level with SVLD Do not use this level with SVLD Depends on ExtVCheck - ADC or SVLD Default level after POR for Power Check ADCNom SVLDNom 0.5 V Do not set 0.65 V Do not set 0.80 V Do not set 0.95 V Do not set 1.10 V 1.20 V 1.25 V 1.25 V 1.40 V 1.40 V 1.55 V 1.55 V 1.70 V 1.70 V 1.85 V 1.85 V 2.00 V 2.00 V 2.15 V 2.15 V 2.30 V 2.30 V 2.45 V 2.45 V 2.60 V 2.60 V 2.75 V 2.75 V
Optional level after POR for Power Check
External source is coming from PA[4] as explained in Chapter 2 and shown on figure 10.
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To implement a 4-bit ADC first ExtVcheck bit must be set to `1', that PA[4] input is connected to positive side of resistor divider chain. To find the level as fast as possible with successive approximation for instance it is advised to Set SVLDen bit to `1' to have comparator and resistive divider chain operational all the time when the PA[4] input is sampled with ck[15] (typ. 16kHz @ 32kHz SysClk) frequency. With SVLDlev[3:0] we can select one of 16 possible levels to check and by making max. 4 measurements at 4 different levels (if input PA[4] is stable) we have the result with successive approximation method. In this case PA[4] input is blocked for all other functions, because its level can be in a zone where logic `0' or `1' are not well defined and this would generate an over consumption otherwise. So it is dedicated only to SVLD comparator input to be compared with internal band-gap reference. NoPullPA[4] must be set to `1' - PullUP/Down must be removed by register also. In both cases if Vdd or PA[4] level is tested than if selected tested level lower an IRQ can be generated if enabled. With SVLDen bit one can switch on the band-gap, resistive divider and Comparator continuously. Like that one can monitor VDD or PA[4] level continuously, at higher frequency (ck[15]). Only at the beginning after setting the SVLDen at `1' one has to wait until VLDbusy drops to `0' indicating that system is powered up (band-gap reference and resistor divider are stabilized and comparator is ready to give proper result). This will increase power consumption by typ. 4A @ Vdd=1.5V while used. During continuously monitoring one can change RegSVLDlev register value on fly and the new result should be read only after about 1.5 * ck[15] to be sure it is a result of a new SVLDlev selection. Depending on CPUclk and divisions to obtained SysClk this can be 2 / 6 / 10 / 20 / 36 instruction after RegSVLDlev change for multiples by 1 / 2 / 4 / 8 / 16. When fast monitoring is not necessary any more one can remove it by clearing SVLDen to `0'. When SVLD logic is used for this fast monitoring IRQ can also be generated when checked level falls below its value. Figure 25. SVLD timing in "ADC" mode when SVLDen set @ "1"
Due to IRQSvld which can come very fast - with ck[15] there is danger that immediately after coming out from IRQ subroutine new IRQSvld which came during that time put uC back in IRQ subroutine and software can be stacked at this place until checked input is lower then SVLD level. Otherwise IntEn register must be cleared in IRQ subroutine already !! or even better to use this function by reading the SVLD result only and not setting the MaskIRQSvld.
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10. ADC/SVLD Comparator characteristics
Vvld (levels 0 to 15)
Level - comparator hyst.
Comparator output
Comparator hysteresis is adaptive in 4 steps controlled by MSB of RegSVLDlev register to cover all tested levels from 0.5V to 3.0V to give a typ. "tested level" hysteresis of 40mV. Negative hysteresis on comparator is implemented to eliminate comparator output oscillation arround switching point.
11. RAM
The EM6680 has one 80x4 bit static RAM built-in located on addresses hex 0 to 4F. All the RAM nibbles are direct addressable. Figure 26. RAM Architecture RAM 80 x 4 = direct addressable Adr [hex] 4F 4E 4D 4B . . . . . . . . . . 04 03 02 01 00 RAM location RAM_79 RAM_78 RAM_77 RAM_76 . . . . . . . . . . RAM_04 RAM_03 RAM_02 RAM_01 RAM_00 Read / Write 4 bit R/W 4 bit R/W 4 bit R/W 4 bit R/W . . . . . . . . . . 4 bit R/W 4 bit R/W 4 bit R/W 4 bit R/W 4 bit R/W
RAM Extension : Unused R/W Registers can often be used as possible RAM extension. Be careful not to use registers which start, stop, or reset some functions.
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12. Interrupt Controller
The EM6680 has 8 different interrupt request sources masked individually. These are: External (2) Internal (6) - Port A, - Compare - Prescaler (2x) - 10-bit Counter (2x) - SVLD (1) - Serial Interface (1) PA[0/5] and PA[3/4] inputs PA[4] input ck[1], 64Hz/8Hz Count0, CountComp End of measure when level is low 8 bit transfered
The SVLD and the PA[4] level check share the same interrupt line. Serial Interface could be put under Internal when Serial clock is coming form EM6680 or External when Serial clock is external. To be able to send an interrupt to the CPU, at least one of the interrupt request flags must be set (IRQxx) and the general interrupt enable bit IntEn located in the register RegSysCntl1 must be set to 1. The interrupt request flags can only be set by a positive edge of IRQxx with the corresponding mask register bit (MaskIRQxx) set to 1. Figure 27. Interrupt control logic for generating and clearing interrupts
Interrupt control logic
At power on or after any reset all interrupt request mask registers are cleared and therefore do not allow any interrupt request to be stored. Also the general interrupt enable IntEn is set to 0 (No IRQ to CPU) by reset. After each read operation on the interrupt request registers RegIRQ1 or RegIRQ2 the contents of the addressed register are reset. Therefore one has to make a copy of the interrupt request register if there was more than one interrupt to treat. Each interrupt request flag may also be reset individually by writing 1 into it (ClrIntBit). Interrupt handling priority must be resolved through software by deciding which register and which flag inside the register need to be serviced first. Since the CPU has only one interrupt subroutine and because the IRQxx registers are cleared after reading, the CPU does not miss any interrupt request which comes during the interrupt service routine. If any occurs during this time a new interrupt will be generated as soon as the software comes out of the current interrupt subroutine. Any interrupt request sent by a periphery cell while the corresponding mask is not set will not be stored in the interrupt request register. All interrupt requests are stored in their IRQxx registers depending only on their corresponding mask setting and not on the general interrupt enable status. Whenever the EM6680 goes into HALT Mode the IntEn bit is automatically set to 1, thus allowing to resume from Halt Mode with an interrupt.
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12.1 Interrupt control registers
Table 12.1.1 Register RegIRQ1 Bit 3 2 1 0 Name Reset R/W IRQCount0 0 R/W* IRQCntComp 0 R/W* IRQPA[3/4] 0 R/W* IRQPA[0/5] 0 R/W* W*; Writing of 1 clears the corresponding bit. Description Counter interrupt request when at 0 Counter interrupt request when compare True Port A PA[3/4] interrupt request Port A PA[0/5] interrupt request
Table 12.1.2 Register RegIRQ2 Bit 3 2 1 0 Name Reset R/W IRQHz1 0 R/W* IRQHz64/8 0 R/W* IRQSvld 0 R/W* IRQSerial 0 R/W* W*; Writing of 1 clears the corresponding bit. Description Prescaler interrupt request of 1Hz Prescaler interrupt request of 64 Hz or 8 Hz SVLD or Compare interrupt request Serial interface interrupt request
Table 12.1.3 Register RegIRQMask1 Bit 3 2 1 0 Name Reset R/W MaskIRQCount0 0 R/W MaskIRQCntComp 0 R/W MaskIRQPA[3/4] 0 R/W MaskIRQPA[0/5] 0 R/W Interrupt is not stored if the mask bit is 0. Description Counter when at 0 interrupt mask Counter compare True interrupt mask Port A PA[3/4] interrupt mask Port A PA[0/5] interrupt mask
Table 12.1.4 Register RegIRQMask2 Bit 3 2 1 0 Name Reset R/W MaskIRQHz1 0 R/W MaskIRQHz64/8 0 R/W MaskIRQSvld 0 R/W MaskIRQSerial 0 R/W Interrupt is not stored if the mask bit is 0. Description Prescaler 1Hz interrupt mask Prescaler 64 Hz or 8 Hz interrupt mask SVLD or Compare interrupt mask Serial interface interrupt mask
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13. PERIPHERAL MEMORY MAP
Reset values are valid after power up or after every system reset.
Register Name Add Add Hex Dec. Reset Value b'3210 xxxx Read Bits Write Bits Remarks Read / Write Bits 0: Data0 1: Data1 2: Data2 3: Data3 0: Data0 1: Data1 2: Data2 3: Data3 0: PAout[0] 0: PA[0] 1: PAout[1] 1: PA[1] 2: PAout[2] 2: PA[2] 3: PAout[3] 3: PA[3] 0: OEnPA[0] 1: OEnPA[1] 2: OEnPA[2] 3: OEnPA[3] 0: EdgeFallingPA[0/5] 1: EdgeFallingPA[3/4] 2: debunceNoPA[0/5] 3: debunceNoPA[3/4] 0: IrqPA[0l/5h] 1: IrqPA[3l/4h] 2: WUchEnPA[0/5] 3: WUchEnPA[3/4] 0: NoPdPA[0] 1: NoPdPA[1] 2: NoPdPA[2] 3: NoPdPA[3] 0: NchOpDrPA[0] 1: NchOpDrPA[1] 2: NchOpDrPA[2] 3: NchOpDrPA[3] 0: foutSel[0] 1: foutSel[1] 2: PA[3/4]resIn 3: InResAH 0: MSBnLSB 1: POSnNeg 2: MS0 3: MS1 0: OM[0] 1: RCoscOff 2: Status 3: Start 0: SerDataL[0] 1: SerDataL[1] 2: SerDataL[2] 3: SerDataL[3] 0: SerDataH[0] 1: SerDataH[1] 2: SerDataH[2] 3: SerDataH[3] 0: CountFSel0 1: CountFSel1 2: CountFSel2 3: Up/Down
Ram1_0
00
0
Direct addressable Ram 80 x 4 bit Direct addressable Ram 80 x 4 bit PortA [3:0] Direct input read, Output data register PortA [3:0] Output enable active Hi, PortA [3:0] control1 Debounce Yes/No & Faling / Rising edge PortA [3:0] control2 WakeUp on change enable & Irq source from PA select Option register Pull/down selection on PA[3:0] Default : pull-down ON Option register N/channel Open Drain Output on PA[3:0] Default : CMOS output Output Frequency select and Input reset Control
Ram1_63
4F
79
xxxx
RegPA0
50
80
0000
RegPa0OE
51
81
0000 0 = after PORend pppp p = POR pppp p = POR
RegPaCntl1
52
82
RegPaCntl2
53
83
Pa0noPDown
54
84
pppp p = POR
Pa0NchOpenDr
55
85
pppp p = POR
RegFreqRst
56
86
ppxx
RegSCntl1
57
87
0000
Serial interface control 1 Serial interface control 2 Serial interface low data nibble Serial interface high data nibble 10-bit counter control 1; frequency and up/down
RegSCntl2
58
88
0000
RegSDataL
59
89
0000
RegSDataH
5A
90
0000
RegCCntl1
5B
91
0000
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Register Name Add Add Hex Dec. Reset Value b'3210 0000 Read Bits Write Bits Remarks 10-bit counter control 2; comparison, event counter and start Read / Write Bits 0: Load 0: '0' 1: EnComp 1: EnComp 2: EvCount 2: EvCount 3: Start 3: Start 0: CReg[0] 0: Count[0] 1: CReg[1] 1: Count[1] 2: CReg[2] 2: Count[2] 3: CReg[3] 3: Count[3] 0: CReg[4] 0: Count[4] 1: CReg[5] 1: Count[5] 2: CReg[6] 2: Count[6] 3: CReg[7] 3: Count[7] 0: CReg[8] 0: Count[8] 1: CReg[9] 1: Count[9] 2: BitSel[0] 2: BitSel[0] 3: BitSel[1] 3: BitSel[1] 0: -0: PA[4] 1: PAout[5] 1: PA[5] 2: OEnPA[5] 2: OEnPA[5] 3: NchOpDrPA[5] 3: NchOpDrPA[5] 0: PWMoutPA[0] 1: PWMoutPA[1] 2: SerialCkPA[1] 3: SerialStPA[3] 0: freqOutPA[2] 1: Sout/rstPA[2] 2: : freqOutPA[5] 3: NoPdPA[5] 0: MaskIRQPA[0/5] 1: MaskIRQPA[3/4] 2: MaskIRQCntComp 3: MaskIRQCount0 0: MaskIRQSerial 1: MaskIRQSvld 2: MaskIRQHz64/8 3: MaskIRQHz1 0:RIRQPA[0/5] 0: IRQPA[0/5] 1:RIRQPA[3/4] 1: IRQPA[3/4] 2:RIRQCntComp 2: IRQCntComp 3:RIRQCount0 3: IRQCount0 0:RIRQSerial 0: IRQSerial 1:RIRQSvld 1: IRQSvld 2:RIRQHz64/8 2: IRQHz64/8 3:RIRQHz1 3: IRQHz1 0: ChTmDis 0: ChTmDis 1: SelIntFull 1: SelIntFull 2: '0' 2: Sleep 3: IntEn 3: IntEn 0: -0: WDVal0 1: -1: WDVal1 2: SleepEn 2: SleepEn 3: WDReset 3: PORstatus 0: SCRsel0 1: SCRsel1 2: SleepCntDis 3: NoPullPA[4]
RegCCntl2
5C
92
RegCDataL
5D
93
0000
10-bit counter data low nibble 10-bit counter data middle nibble 10-bit counter data high bits PortA [5:4] Direct input read, Output data register with Output enable active Hi PortA Control3 Output distribution on PA[0], PA[1] and PA[3] PortA Control4 Output distribution on PA[2] and PA[5] Port A & Counter interrupt mask; masking active 0 Prescaler, SVLD & serial interf. interrupt mask; masking active low Read: port A & Counter interrupt Write: Reset IRQ if data bit = 1. Read: Prescaler, SVLD & serial interface interrupt. Write: Reset IRQ if data bit = 1 System control 1; ChTmDis only usable only for EM test modes System control 2; watchdog value and periodical reset, enable sleep mode Sleep Counter reset control
RegCDataM
5E
94
0000
RegCDataH
5F
95
0000
RegPA1
60
96
p000
RegPaCntl3
61
97
pppp
RegPaCntl4
62
98
ppPP
RegIRQMask1
65
101
0000
RegIRQMask2
66
102
0000
RegIRQ1
67
103
0000
REgIRQ2
68
104
0000
RegSysCntl1
69
105
000p p = POR
RegSysCntl2
6A
106
Pp00 p = POR
RegSleepCR
6B
107
pppp p = POR
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Register Name Add Add Hex Dec. Reset Value b'3210 0000 Read Bits Write Bits Remarks Prescaler control; Debouncer, prescaler interrupt select and reset, External CPU clock enable Internal P index register low nibble; for P indexed addressing Internal P index register high nibble; for P indexed addressing Voltage level detector & RC osc. control SVLD test voltage level select Read / Write Bits 0: DebSel 0: DebSel 1: PrIntSel 1: PrIntSel 2: ResPresc 2: '0' 3: ExtCPUclkON 3: ExtCPUclkON 0: IXLow[0] 1: IXLow[1] 2: IXLow[2] 3: IXLow[3] 0: IXHigh[4] 0: IXHigh[4] 1: IXHigh[5] 1: IXHigh[5] 2: IXHigh[6] 2: IXHigh[6] 3: -3: '0' 0: NoWDtim 0: NoWDtim 1: SVLDen 1: SVLDen 2: VldStart 2: VldBusy 3: ExtVcheck 3: VldResult 0: SVLDlev[0] 1: SVLDlev[1] 2: SVLDlev[2] 3: SVLDlev[3] 0: Tmsel[0] 1: Tmsel[1] 2: Tmsel[2] 3: disablePOR 0: OeTm0 1: OeTm1 2: TestResSys 3: TestPOR
RegPresc
6C
108
IXLow
6E
110
xxxx
IXHigh
6F
111
xxxx
RegVldCntl
73
115
000p
RegSVLDlev
74
116
pPpp
RegTestEM1
7E
126
pppp
For EM test only
RegTestEM2
7F
127
pppp
For EM test only
p = defined by POR at `0' (power on reset) only P = defined by POR at `1' (power on reset) only x = undefined state by reset (register must be written before used) RegTestEm1 and RegTestEm2 can be written only if ChTmDis in RegSysCntl1 is `0'. They are used for EM test only and are Write only. To prevent entering test mode in normal operation one has to set the ChTmDis bit to `1' as soon as possible after reset. It should be one of first instructions.
14. Active Supply Current test
For this purpose, five instructions at the end of the ROM will be added. This will be done at EM Marin. User can use only up to 1499 Instructions (the rest - 37 instructions are used for EM tests).
TESTLOOP : STI LDR NORX JPZ JMP
00H, 0AH 1BH FFH TESTLOOP
0
;TEST LOOP
To stay in the testloop, these values must be written in the corresponding addresses before jumping in the loop: 1BH: 0101b 32H: 1010b 6EH: 0010b 6FH: 0011b Free space after last instruction: JMP 00H (0000) Remark: empty space within the program are filled with NOP (FOFF).
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15. Mask Options
Most options which in many Controllers are realized as metal mask options are directly user selectable with the control registers, therefore allowing a maximum freedom of choice. The following options can be selected at the time of programming the metal mask ROM.
15.1 Input / Output Ports 15.1.1 Port A Metal Options
Except for PA[4] which can have only strong Pull-up or Pull-down and where resistor can be removed by software register NoPullUpDown[4], all other port A inputs can have Pull-up or no pull-up and Pull-down or no pull-down. The pull-up is only active in Nch. open drain mode. The total pull value (pull-up or pull-down) is a series resistance out of the resistance R1 (in range from 0 - 110 k) and the switching transistor. As a switching transistor the user can choose between a high impedance (weak) or a low impedance (strong) switch. Weak , strong or none must be chosen. The default is strong. The default resistor R1 value is 100 k. The user may choose a different value from 110 k down to10 k. However the value must first be checked and agreed by EM Microelectronic Marin SA. Allowed typical values are values between 10 k and 110 k in steps of 10k, Refer also to chapter 15.7 for the pull values. Figure 28. PA[5], PA[3:0] metal option architecture
Table 15.1.1 Pull-down Metal mask Options Description
Strong Pull-down Weak Pull-down R1 Value Typ.100k NO Pull-Down
Option Name 1 2 3 PA[5] input pull-down MAPD[5] PA[4] input pull-down MAPD[4] PA[3] input pull-down MAPD[3] PA[2] input pull-down MAPD[2] PA[1] input pull-down MAPD[1] PA[0] input pull-down MAPD[0] To select an option put an X in column 1,2 and 4 and reconfirm the R1 value in column 3. The default value is : strong pull-down with R1=100 k Total value of typ. 98 k at Vdd =3.0V
4
PA[4] can have only Pull-Up OR Pull-Down option, others can have both and then it is software controlled for PullUp or PullDown, Note: The mask settings MAPD[n] do not define the default pull direction, but the pull possibilities. It is the software which defines the pull direction (pull-up or pull-down). The only exception is on PA[4] where the user must decide if he wants pull-up or pull-down. For this input the selected pull direction will always be valid unless the software disconnects the pull resistor. If the mask is not present (No Pull selection) then the corresponding pull resistor is physically cut-off and can not be reconnected by software.
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Table 15.1.2 Pull-up Metal mask Options Strong Description
Pull-up Weak Pull-up R1 Value Typ.100k NO Pull-up
Option Name 1 2 3 4 PA[5] input pull-up MAPU[5] PA[4] input pull-up MAPU[4] PA[3] input pull-up MAPU[3] PA[2] input pull-up MAPU[2] PA[1] input pull-up MAPU[1] PA[0] input pull-up MAPU[0] To select an option put an X in column 1,2 and 4 and reconfirm the R1 value in column 3. The default value is : strong pull-up with R1=100 k Total value of typ. 99 k at Vdd =3.0V PA[4] can have only Pull-Up OR Pull-Down option, others can have both and then it is software controlled for PullUp or PullDown, Note: The mask settings MAPU[n]) do not define the default pull direction, but the pull possibilities. It is the software which defines the pull direction (pull-up or pull-down). The only exception is on PA[4] where the user must decide if he wants pull-up or pull-down. For this input the selected pull direction will always be valid unless the software disconnects the pull resistor. If the mask is not present (No Pull selection) then the corresponding pull resistor is physically cut-off and can not be reconnected by software.
15.1.2 RC oscillator Frequency Option
Option Name RCfreq RC osc Frequency Default Value A 32 kHz
User Value
B
By default the RC oscillator frequency is typ. 32 kHz With option RCfreq. Other possibilities are: 64kHz, 128kHz, 256kHz and 500kHz or 50kHz, 100kHz, 200kHz, 400kHz or max. 800kHz .
15.1.3 Debouncer Frequency Option
Option Name MDeb Debouncer freq. Default Value A Ck[11]
User Value
B
By default the debouncer frequency is Ck[11]. The user may choose Ck[14] instead of Ck[11]. Ck[14 ]corresponds to maximum 0.25ms debouncer time in case of a 32kHz System Clock - SysClk. Higher frequency can not work well if Voltage is too low. So this option must be selected with help of EM to gurantee proper operation. Possible options are SVLD#5 @ 1.25V (default - to be used with "low" frequency) and SVLD#9 @ 1.85V for "high" frequency.
15.1.4 Power-Check Level Option
Option Name PClev. Power-Check level Default Value A #5(1.25V)
User Value
B
15.1.5 ADC/SVLD Voltage Level #15
Option Name HisvldLev. ADC/SVLD lev.#15 Default Value A 2.75V
User Value
B
By default the ADC/SVLD Voltage Level #15 is at 2.75V but user can select also the second possibility which is 3.0V and does not influence on other ADC/SVLD levels.
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15.1.6 Counter Update option
Option Name CntF Counter Reg. level Default User Value Value A B SysClk RCclk By default the counter is updated by Sysclk (32 or 50kHz typ) and the highest counter frequency is Sysclk/2 (16 or 25kHz Typ). The other possibility is to select CPUclk/2 for counter update freq. Which gives a possibility to replace port A input at selection 7 by CPUclk/2. If DebouncerNoPA[3/4] in RegPACntl[1] is `1' then the resulting clock on timer selection 7 is CPUClk divided by 4. If DebouncerNoPA[3/4] is `0' then the resulting clock is CpuClk/2 directly.
Note: CPUClk = RCClk if no external clock used. In case of external clock, CPUClk is equal to the PA[1] input clock.
15.1.7 Voltage Regulator level
Option Name LevelReg Voltage Reg. level Default Value A 2T
User Value
B
By default the internal voltage regulator is based on 2 transistor thresholds (~1.5V). We can add one threshold (3T, ~2.1V) and additional current to increase Vreg level. Higher Vreg is needed for higher CPU frequencies !!! Possible are: 2T,3T.
Please contact EM for proper selection. 3T (3 tresholds) must be used for frequencies above 300 kHz. Figure 29. Minimum VDD = f(RC oscillator)
Rcfreq = CPU freq = f(Vddmin)
1.9 1.8
m in Vbat (Vdd ) [V]
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0 100
LevelReg 2T<=
LevelReg =>3T
200
300
400
500
600
700
f [kHz]
800
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16. Temp. and Voltage Behaviors
16.1 IDD Current (Typical) and Vreg for 2 thresholds and 1/3 of possible current for Vreg.
Idd-sleep = f(Vdd,temp) Vreg = 2 tresholds & 1/3 current
350 300 4.00 250 Idd-sleep [nA] Idd-Halt [uA] 200 150 100 1.5V 50 0 -20 0 20 40 60 80 temp [ C] -20 2.00 0 20 40 60 80 temp [C] 3.0V 2.50 3.50
Idd-Halt = f(Vdd,temp), Rcosc = 32 kHz typ. Vreg = 2 tresholds & 1/3 current, RCtempComp=ON
4.50
3.00 1.5V 3.0V
Idd-Run = f(Vdd,temp), Rcosc = 32 kHz typ. Vreg = 2 tresholds & 1/3 current, RCtempComp=ON
5.00 1.60
Vreg = f(Vdd,temp), Rcosc = 32 kHz typ. Vreg = 2 tresholds & 1/3 current
1.50 4.50 Idd-Run [uA] 1.40
4.00
Vreg [V]
1.30
3.50 1.20 1.5V 3.00 -20 0 20 40 60 80 temp [C] -20 3.0V 1.10 0 20 40 60 80 temp [C] 1.5V 3.0V
16.2 Pull-down Resistance (Typical)
Pull-down strong = f(Vdd, temp)
110 105 100 r [kOhm]
r [kOhm] 200 190 180 170 160 1.5V 3 150 140 130 120 110 100 90 1.5V 3
Pull-down weak = f(Vdd, temp)
95 90 85 80 -20 0 20 40
60
80 temp [C]
-20
0
20
40
60
80 tem p [C]
16.3 Pull-up Resistance (Typical)
Pull-up strong = f(Vdd, temp)
420 400 380 360 340 320 300 280 260 240 220 200 180 160 140 120 -20 0 20 40
Pull-up weak = f(Vdd, temp)
115 110 105 r [kOhm] 100 1.5 95 90 85 -20 0 20 40 60 80 tem p [C] 3
r [kOhm]
1.5V
3
60
80 tem p [C]
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16.4 Output Currents (Typical)
Iol - Buffer output current on PA[5,0] @ Vdd = 1.5V
9 8 7 6 Iol [mA] 5 4 3 2 1 0 -20 0 20 40 60 80 temp [C] -20 0 0 20 40 60 80 temp [C] Iol [mA] 20 15 10 5
Iol - Buffer output current on PA[5,0] @ Vdd = 3.0V
30
Vol=0.15V Vol=0.3V Vol=0.5V Vol=1.0V
25
Iol - Buffer output current on PA[2:1] @ Vdd = 1.5V
20 18 16 14 Iol [mA] Iol [mA] 12 10 8 6 4 2 0 -20 0 20 40 60 80 tem p [C] -20 Vol=0.15V Vol=0.3V Vol=0.5V
Iol - Buffer output current on PA[2:1] @ Vdd = 3.0V
60 50 40 30 20 10 0 0 20 40 60 80 tem p [C]
Iol - Buffer output current on PA[3] @ Vdd = 1.5V
12 10 8 Iol [mA] Iol [mA] 6 4 2 0 -20 0 20 40 60 80 tem p [C] -20 Vol=0.15V Vol=0.3V Vol=0.5V 45 40 35 30 25 20 15 10 5 0
Iol - Buffer output current on PA[3] @ Vdd = 3.0V
Vol=0.15V
Vol=0.3V
Vol=0.5V
Vol=1.0V
0
20
40
60
80 tem p [C]
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Ioh - Buffer output current on PA[5,0] @ Vdd = 1.5V
0 -20 -0.5 -1 Iol [mA] -1.5 -2 -2.5 -3
Voh=1.35V Voh=1.2V Voh=1.0V
Ioh - Buffer output current on PA[5,0] @ Vdd = 3.0V
0
0
20
40
60
80
-20
-2 -4 -6
0
20
40
60
80
Iol [mA]
-8 -10 -12 -14
Voh=2.85V Voh=2.7V Voh=2.5V Voh=2.0V
-3.5 temp [C]
-16 temp [C]
Ioh - Buffer output current on PA[2:1] @ Vdd = 1.5V
0 -20 -1 0 20 40 Voh=1.35V 60 Voh=1.2V 80 Voh=1.0V -20
Ioh - Buffer output current on PA[2:1] @ Vdd = 3.0V
0 0 -5 -10 Iol [mA] 20 40 60 80
-2 Iol [mA]
-3
-15
-4
-20 -25 Voh=2.85V Voh=2.7V Voh=2.5V Voh=2.0V tem p [C]
-5
-6
-30 tem p [C]
Ioh - Buffer output current on PA[3] @ Vdd = 1.5V
0 -20 -0.5 -1 -1.5 Iol [mA] Iol [mA] -2 -2.5 -3 -3.5 -4 0 20 40 Voh=1.35V 60 Voh=1.2V 80 Voh=1.0V -20
Ioh - Buffer output current on PA[3] @ Vdd = 3.0V
0 -2 -4 -6 -8 -10 -12 -14 -16 -18 tem p [C] -20 tem p [C] Voh=2.85V Voh=2.7V Voh=2.5V Voh=2.0V 0 20 40 60 80
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17. Electrical Specification 17.1 Absolute Maximum Ratings
Power supply VDD-VSS Input voltage Storage temperature Electrostatic discharge to Mil-Std-883C method 3015.7 with ref. to VSS Min. - 0.2 VSS - 0.2 - 40 -2000 Max. + 3.6 VDD+0.2 + 125 +2000 Units V V C V
Maximum soldering conditions Packages are Green-Mold and Lead-free
As per Jedec J-STD-020C
Stresses above these listed maximum ratings may cause permanent damage to the device. Exposure beyond specified electrical characteristics may affect device reliability or cause malfunction.
17.2 Handling Procedures
This device has built-in protection against high static voltages or electric fields; however, anti-static precautions should be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the supply voltage range.
17.3 Standard Operating Conditions
Parameter Temperature Vdd _Range1 Vdd _Range2 @25 Vdd _Range3 @-20 Ivss max Ivdd max VSS CVDDCA (note 1) fRC MIN -20 1.4 1.2 1.35 TYP 25 3.0 1.5 1.5 MAX 85 3.6 1.8 1.8 80 80 Unit C V V V mA mA V nF kHz Description with internal voltage regulator without internal voltage regulator without internal voltage regulator Maximum current out of Vss Pin Maximum current into of Vdd Pin Reference terminal regulated voltage capacitor Range of typ. RC frequency
0 100 30 800
Note 1: This capacitor filters switching noise from Vdd to keep it away from the internal logic cells. In noisy systems the capacitor should be chosen bigger than minimum value.
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17.4 DC Characteristics - Power Supply
Conditions: Vdd =1.5V, T=25C, RCfreq = 32 kHz .
Parameter ACTIVE Supply Current ACTIVE Supply Current STANDBY Supply Current STANDBY Supply Current SLEEP Supply Current SLEEP Supply Current POR static level POR static level Power-Check level (low f) (@ RC oscill.high frequency) RAM data retention
VPOR Typ
1.300 1.200 VPOR [V] 1.100 1.000 0.900 0.800 0.700 -20 0 20 40 60 80 temp [C]
Conditions -20 ... 85C -20 ... 85C -20 ... 85C -20 ... 85C -20 ... 85C
Symbol IVDDa1 IVDDa1 IVDDh1 IVDDh1 IVDDs1 IVDDs1 VPOR VPOR VPC5 VPC9 Vrd1
Min.
Typ. 4.0 3.5 0.65 1.05 1.05 1.25 1.85
Max. 5.0 7.0 4.8 6.0 0.8 1.5 1.36 1.2 1.41 2.09
1.0
Unit A A A A A A V V V V V
Conditions: Vdd =3.0V, T=25C, RCfreq = 32 kHz .
Parameter ACTIVE Supply Current ACTIVE Supply Current STANDBY Supply Current STANDBY Supply Current SLEEP Supply Current SLEEP Supply Current Vreg Conditions -20 ... 85C -20 ... 85C -20 ... 85C Symbol IVDDa2 IVDDa2 IVDDh2 IVDDh2 IVDDs2 IVDDs2 Vreg2 Min. Typ. 4.0 3.0 0.65 1.55 Max. 5.0 7.0 4.8 6.0 0.8 1.5 Unit A A A A A A V
Idd @ Voltage regul ator with 2T /W = f(freq[kHz])
30 25 20
120 100 80
Idd @ Voltage regul ator with 3T /W = f(freq[kHz])
I [uA]
15 10 5 0 0 50 100 150 200 250
halt run
I [uA]
60 40 halt 20 0 run
f [kHz]
300
200
300
400
500
600
700
800
900
f [kHz]
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Conditions: VDD=3.0V, T=25C, RCfreq = 256 kHz
Parameter ACTIVE Supply Current ACTIVE Supply Current STANDBY Supply Current STANDBY Supply Current SLEEP Supply Current SLEEP Supply Current Vreg Conditions -20 ... 85C -20 ... 85C -20 ... 85C Symbol IVDDa3 IVDDa3 IVDDh3 IVDDh3 IVDDs3 IVDDs3 Vreg3 Min. Typ. 36 27 0.65 1.55 Max. 45 48 35 38 0.8 1.5 Unit A A A A A A
Conditions: VDD=3.0V, T=25C, RCfreq = 800 kHz
Parameter ACTIVE Supply Current ACTIVE Supply Current STANDBY Supply Current STANDBY Supply Current SLEEP Supply Current SLEEP Supply Current Vreg Conditions -20 ... 85C -20 ... 85C -20 ... 85C Symbol IVDDa4 IVDDa4 IVDDh4 IVDDh4 IVDDs4 IVDDs4 Vreg4 Min. Typ. 110.0 80 0.65 2.1 Max. 140.0 200.0 115 150.0 0.8 1.7 Unit A A A A A A V
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17.5 Supply Voltage Level Detector
SVLD levels, here below, are specified with a rising voltage on PA[4] or VDD. When voltage is falling a negative hysteresis has to be removed from the specified value.
Vvld (levels 0 to 15) VDD or PA[4] - comparator hyst.
SVLD result
Conditions: VDD=3.0V, T=25C, with internal voltage regulator (unless otherwise specified)
Parameter Temperature coefficient ADC voltage Level0 ADC voltage Level1 ADC voltage Level2 ADC voltage Level3 ADC voltage Level4 SVLD voltage Level4a** ADC/SVLD voltage Level5 ADC/SVLD voltage Level6 ADC/SVLD voltage Level7 ADC/SVLD voltage Level8 ADC/SVLD voltage Level9 ADC/SVLD voltage Level10 ADC/SVLD voltage Level11 ADC/SVLD voltage Level12 ADC/SVLD voltage Level13 ADC/SVLD voltage Level14 ADC/SVLD voltage Level15 ADC/SVLD voltage Level15b* ADC/SVLD level negative hysteresis Conditions 0 to 50C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C Symbol VVLD0 VVLD1 VVLD2 VVLD3 VVLD4 VVLD4a VVLD5 VVLD6 VVLD7 VVLD8 VVLD9 VVLD10 VVLD11 VVLD12 VVLD13 VVLD14 VVLD15 VVLD15b Vvld_hyst Min. 0.44 0.57 0.70 0.83 0.98 1.07 1.11 1.25 1.38 1.54 1.67 1.81 1.94 2.11 2.25 2.38 2.52 2.75 10 Typ. < 0.1 0.50 0.65 0.80 0.95 1.10 1.20 1.25 1.40 1.55 1.70 1.85 2.00 2.15 2.30 2.45 2.60 2.75 3.00 40 Max. 0.55 0.73 0.86 1.02 1.17 1.32 1.38 1.54 1.71 1.87 2.04 2.20 2.37 2.53 2.70 2.86 3.03 3.30 100 Unit mV/C V V V V V V V V V V V V V V V V V V mV
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Conditions: Vdd =3.0V, T=25C, with internal voltage regulator (unless otherwise specified)
Parameter ADC voltage Level0 ADC voltage Level1 ADC voltage Level2 ADC voltage Level3 ADC voltage Level4 SVLD voltage Level4a** ADC/SVLD voltage Level5 ADC/SVLD voltage Level6 ADC/SVLD voltage Level7 ADC/SVLD voltage Level8 ADC/SVLD voltage Level9 ADC/SVLD voltage Level10 ADC/SVLD voltage Level11 ADC/SVLD voltage Level12 ADC/SVLD voltage Level13 ADC/SVLD voltage Level14 ADC/SVLD voltage Level15 ADC/SVLD voltage Level15b* Conditions -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C -20 to 85C Symbol VVLD0 VVLD1 VVLD2 VVLD3 VVLD4 VVLD4a VVLD5 VVLD6 VVLD7 VVLD8 VVLD9 VVLD10 VVLD11 VVLD12 VVLD13 VVLD14 VVLD15 VVLD15b Min. 0.43 0.55 0.68 0.81 0.95 1.04 1.08 1.21 1.34 1.49 1.62 1.75 1.88 2.04 2.17 2.31 2.44 2.66 Typ. 0.50 0.65 0.80 0.95 1.10 1.20 1.25 1.40 1.55 1.70 1.85 2.00 2.15 2.30 2.45 2.60 2.75 3.00 Max. 0.57 0.75 0.90 1.07 1.24 1.36 1.41 1.58 1.75 1.92 2.09 2.26 2.43 2.60 2.77 2.94 3.11 3.39 Unit V V V V V V V V V V V V V V V V V V
** ADC level #4 (from PA[4] input) and SVLD level #4 (from VDD) are not identical. Due to VDD min = Vdd min of 1.2V level4a corresponds to SVLD level4 (1.2V typ.) only when VDD is controlled. When used for ADC Voltage Level4 of 1.1V typ is selected to have linear scale on ADC levels. * ADC/SVLD Voltage Level 15 / 15b. For the highest ADC/SVLD level we have a metal option where user can select 2.75V typ. or 3.0V typ. This option does not have any influence on other ADC/SVLD levels. See Option 14.1.6.ADC/SVLD Voltage Level #15 on page 43.
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17.6 DC characteristics - I/O Pins
Conditions: T= -20 ... 85C (unless otherwise specified) Vdd =1.5V means; measures without voltage regulator Vdd =3.0V means; measures with voltage regulator
Parameter Input Low voltage Port A[5:0] Port A[5:0] Input High voltage Port A[5:0] Input Pull-down PA[5:0] (note 3) weak Input Pull-up PA[5:0] (note 3) weak Input Pull-down PA[5:0] (note 3) strong Input Pull-up PA[5:0] (note 3) strong Output Low Current PA[5,0] Vdd =1.5V, Pin at 1.5V, 25C Vdd =3.0V, Pin at 3.0V, 25C Vdd =1.5V, Pin at 0.0V, 25C Vdd =3.0V, Pin at 0.0V, 25C Vdd =1.5V, Pin at 1.5V, 25C Vdd =3.0V, Pin at 3.0V, 25C Vdd =1.5V, Pin at 0.0V, 25C Vdd =3.0V, Pin at 0.0V, 25C Vdd =1.5V , VOL=0.15V Vdd =1.5V , VOL =0.30V Vdd =1.5V , VOL =0.50V Vdd =3.0V , VOL =0.15V Vdd =3.0V , VOL =0.30V Vdd =3.0V , VOL =0.50V Vdd =3.0V , VOL =1.00V Output Low Current PA[2,1] Vdd =1.5V , VOL =0.15V Vdd =1.5V , VOL =0.30V Vdd =1.5V , VOL =0.50V Vdd =3.0V , VOL =0.15V Vdd =3.0V , VOL =0.30V Vdd =3.0V , VOL =0.50V Vdd =3.0V , VOL =1.00V Output Low Current PA[3] Vdd =1.5V , VOL =0.15V Vdd =1.5V , VOL =0.30V Vdd =1.5V , VOL =0.50V Vdd =3.0V , VOL =0.15V Vdd =3.0V , VOL =0.30V Vdd =3.0V , VOL =0.50V Vdd =3.0V , VOL =1.00V VIH RPD RPD RPU RPU RPD RPD RPU RPU IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL IOL 12.0 5.4 16.0 7.0 7.0 4.0 0.7 Vdd 100k 80k 300k 115k 81k 80k 85k 81k 170k 110k 400k 150k 99k 98k 103k 99k 2.6 4.9 7.6 3.6 7.2 12 23 5 9.5 14.6 7 13.9 23 45 3.4 6.6 10.2 5 9.9 16.5 32.0 Vdd 400k 250k 900k 350k 123k 122k 127k 123k V Vdd < 1.5V Vdd > 1.5V VIL VIL Vss Vss 0.2 Vdd 0.3 Vdd V V Conditions Symb. Min. Typ. Max. Unit

mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA
Note 3 : Weak or strong are standing for weak pull or strong pull transistor. Values are for R1=100k
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Parameter Output High Current PA[5,0] Conditions Vdd =1.5V, VOH= Vdd -0.15V Vdd =1.5V, VOH = Vdd -0.30V Vdd =1.5V, VOH = Vdd -0.50V Vdd =3.0V, VOH = Vdd -0.15V Vdd =3.0V , VOH = Vdd -0.30V Vdd =3.0V , VOH = Vdd -0.50V Vdd =3.0V , VOH = Vdd -1.00V Output High Current PA[2,1] Vdd =1.5V, VOH = Vdd -0.15V Vdd =1.5V, VOH = Vdd -0.30V Vdd =1.5V, VOH = Vdd -0.50V Vdd =3.0V, VOH = Vdd -0.15V Vdd =3.0V , VOH = Vdd -0.30V Vdd =3.0V , VOH = Vdd -0.50V Vdd =3.0V , VOH = Vdd -1.00V Output High Current PA[3] Vdd =1.5V, VOH = Vdd -0.15V Vdd =1.5V, VOH = Vdd -0.30V Vdd =1.5V, VOH = Vdd -0.50V Vdd =3.0V, VOH = Vdd -0.15V Vdd =3.0V , VOH = Vdd -0.30V Vdd =3.0V , VOH = Vdd -0.50V Vdd =3.0V , VOH = Vdd -1.00V Symb. IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH IOH Min. Typ. -1.0 -1.9 -2.8 -1.7 -3.4 -5.5 -10.4 -2.0 -3.7 -5.4 -2.9 -5.7 -9.4 -17 -1.3 -2.5 -3.6 -2.2 -4.3 -7.1 -13.0 -3.2 -2.0 -6.4 -3.0 -2.5 -1.5 Max. Unit mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA mA
17.7 RC oscillator frequency
Conditions: Vdd =3.0V, T=25C, with internal voltage regulator, Not trimmed absolute RC frequency.
Parameter Voltage stability (note 4) Voltage stability (note 5) Basic 32 kHz Basic 32 kHz x 2 Basic 32 kHz x 4 Basic 32 kHz x 8 Basic 32 kHz x 16 Basic 50 kHz Basic 50 kHz x 2 Basic 50 kHz x 4 Basic 50 kHz x 8 Basic 50 kHz x 16 Conditions Vdd =1.8 - 3.0 V Vdd =1.4 - 1.6 V -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C Symbol df/f x dU df/f x dU fb1 fb1x2 fb1x4 fb1x8 fb1x16 fb2 fb2x2 fb2x4 fb2x8 fb2x16 Min. Typ. 0.4 32 64 128 256 500 50 100 200 400 800 Max. 1.0 5.0 +25% +25% +25% +25% +25% +25% +25% +25% +25% +25% Unit %/V %/V kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz
-25% -25% -25% -25% -25% -25% -25% -25% -25% -25%
Note 4 : Applicable only for the versions with the internal voltage regulator Note 5 : Applicable only for the versions without the internal voltage regulator.
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Conditions: Vdd =3.0V, T=25C, with internal voltage regulator, Trimmed absolute RC frequency
Parameter Basic 32 kHz Basic 32 kHz x 2 Basic 32 kHz x 4 Basic 32 kHz x 8 Basic 32 kHz x 16 Basic 50 kHz Basic 50 kHz x 2 Basic 50 kHz x 4 Basic 50 kHz x 8 Basic 50 kHz x 16 Oscillator start voltage Oscillator start time System start time (oscillator + cold-start + reset) Conditions -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C -10 to 60C Tstart < 10 ms Vdd > VDDMin Vdd > VDDMin Symbol fb1 fb1x2 fb1x4 fb1x8 fb1x16 fb2 fb2x2 fb2x4 fb2x8 fb2x16 Ustart tdosc tdsys Min. -10% -10% -10% -10% -10% -10% -10% -10% -10% -10% VDDmin Typ. 32 64 128 256 500 50 100 200 400 800 0.1 0.5 Max. -10% -10% -10% -10% -10% -10% -10% -10% -10% -10% 5.0 6.0 Unit kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz V ms ms
17.8 Sleep Counter Reset - SCR
Conditions: Vdd =3.0V, T=25C, with internal voltage regulator
Parameter SCR timeout 0 SCR timeout 1 SCR timeout of 2 SCR timeout of 3 Conditions -20 to 85C -20 to 85C -20 to 85C -20 to 85C Symbol tSCR00 tSCR01 tSCR10 tSCR11 Min. Typ. 3.6 35 280 2240 Max. Unit ms ms ms ms
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18. Package Dimensions 18.1 SO-8/14
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18.2 TSSOP-8/14
4 B 1.00 1.00 DIA.
3 2 1
C
B
B
E/2 1.00 E E1 4X 0.20 0.20 2X N/2 TIPS A H A-B C A-B D D
N
C L
5
7 D 4 SEE DETAIL "A"
4
TOP VIEW
END VIEW
THIS TABLE FOR 0.65mm PITCH
S Y M B O L
A A1 A2 aaa b b1 bbb c c1 D E1
COMMON DIMENSIONS MIN. NOM. MAX.
0.05 0.85 0.90 0.076 0.19 0.19 0.22 0.10 0.09 0.09 0.127 SEE VARIATIONS 4.30 4.40 0.65 BSC 6.40 BSC 0.50 0.60 SEE VARIATIONS SEE VARIATIONS SEE VARIATIONS 1.10 0.15 0.95 0.30 0.25 0.20 0.16 4.50
N
O
T
E
NOTE VARIATIONS
5 D
3.00 BSC 5.00 BSC 5.00 BSC 6.50 BSC 7.80 BSC 9.70 BSC
9
AA/AAT AB-1/ABT AB/ABT AC/ACT AD/ADT AE/AET
P MAX.
2.2 3.1 3.0 4.2 5.5 5.5
P1 MAX.
3.2 3.0 3.0 3.0 3.0 3.0
7 N
8 14 16 20 24 28
- DESIGNED BUT NOT TOOLED 5 5
e
b
bbb
M C A-B A2 0.05
D C
9
(14) D
0.25 PARTING LINE H L6 X (1.00) X = A AND B X (14) X = A AND B
C (O )C
DETAIL 'A'
(SCALE: 30/1) (VIEW ROTATED 90 C.W.)
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H
0
8
3
aaa e 5 A1 SEATING PLANE
e/2
ODD LEAD SIDES TOPVIEW
EVEN LEAD SIDES TOPVIEW
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C
C O C
C 8
E L N P P1
0.70
6 7 13 13
A
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19. Ordering Information
Packaged Device: EM6680 SO8 A - %%%
Package: SO8 = 8 pin SOIC TP8 = 8 pin TSSOP DL8 = 8 pin DIP (note 1) SO14 = 14 pin SOIC TP14 = 14 pin TSSOP Delivery Form: A = Stick B = Tape&Reel (for SO8 and TP8 only) Customer Version: customer-specific number given by EM Microelectronic
Device in DIE Form: EM6680 WS 11 - %%%
Die form: WW = Wafer WS = Sawn Wafer/Frame WP = Waffle Pack Thickness: 11 = 11 mils (280um), by default 27 = 27 mils (686um), not backlapped (for other thickness, contact EM)
Customer Version: customer-specific number given by EM Microelectronic
Note 1: Please contact EM Microelectronic-Marin S.A. for availability of DIP package. Ordering Part Number (selected examples)
Part Number EM6680SO8A-%%% EM6680SO8B-%%% EM6680SO14A-%%% EM6680TP8A-%%% EM6680TP8B-%%% EM6680WS11-%%% EM6680WP11-%%% Package/Die Form 8 pin SOIC 8 pin SOIC 14 pin SOIC 8 pin TSSOP 8 pin TSSOP Sawn wafer Die in waffle pack Delivery Form/ Thickness Stick Tape&Reel Stick Stick Tape&Reel 11 mils 11 mils
Please make sure to give the complete Part Number when ordering, including the 3-digit customer version. The customer version is made of 3 numbers %%% (e.g. 008 , 012, 131, etc.)
19.1 Package Marking
8-pin SOIC marking: First line: Second line: Third line: 6 6 8 0%%% PPPPPPP CCCYP 14-pin SOIC marking: First line: Second line: Third line: E M 6 6 8 0% % PPPPPPPP CCCCCCYP 8-pin TSSOP marking: 66 8 %% % C 0 P
14-pin TSSOP marking: 66 PP 8 P P 0 %% PPP PPY
Where: %%% or %% = customer version, specific number given by EM (e.g. 008, 012, 131, etc.) PP...P = Production identification (date & lot number) of EM Microelectronic Y = year of assembly CC...C = Customer specific package marking on third line, selected by customer
19.2 Customer Marking
There are 3 digits available for customer marking on SO8, 1 for TSSOP8, 6 for SO14 and 0 for TSSOP14. Please specify the desired customer marking:
EM Microelectronic-Marin SA (EM) makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in EM's General Terms of Sale located on the Company's web site. EM assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of EM are granted in connection with the sale of EM products, expressly or by implications. EM's products are not authorized for use as components in life support devices or systems. (c) EM Microelectronic-Marin SA, 01/06, Rev. M
Copyright (c) 2005, EM Microelectronic-Marin SA
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