Ultra Low Power 8-pin Microcontroller

R EM MICROELECTRONIC - MARIN SA EM6680 Ultra Low Power 8-pin Microcontroller Features True Low Power: 4.0 µA active mode 3.0 µA standby mode 0.65 µA sleep mode @ 1.5V, 32kHz, 25°C 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 × 16 bits RAM 80 × 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 ( 2×10-bit counter, 2× 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) Copyright © 2005, EM Microelectronic-Marin SA 1 www.emmicroelectronic.com R 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 µA in active mode - 3.5 µA in standby mode - 0.35 µA in sleep mode @ 1.5V, 32kHz, 25°C 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 ! Copyright © 2005, EM Microelectronic-Marin SA 2 www.emmicroelectronic.com R 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