EM78P341N/342N/343N
8-Bit Microprocessor with OTP ROM
6.4.1 Usage of Port 5 Input Change Wake-up/Interrupt Function
(1) Wake-up
(a) Before Sleep
(2) Wake-up and Interrupt
(a) Before Sleep
1. Disable WDT
1. Disable WDT
2. Read I/O Port 5 (MOV R65R5)
3. Execute "ENI" or "DISI"
2. Read I/O Port 5 (MOV R5,R5)
3. Execute "ENI" or "DISI"
4. Enable wake-up bit (Set RE
ICWE =1)
4. Enable wake-up bit (Set RE ICWE =1)
5. Execute "SLEP" instruction
(b) After wake-up
5. Enable interrupt (Set IOCF ICIE =1)
6. Execute "SLEP" instruction
(b) After wake-up
→ Next instruction
1. IF "ENI" → Interrupt vector (008H)
2. IF "DISI" → Next instruction
(3) Interrupt
(a) Before Port 5 pin change
1. Read I/O Port 6 (MOV R5,R5)
2. Execute "ENI" or "DISI"
3. Enable interrupt (Set IOCF ICIE =1)
(b) After Port 5 pin changed (interrupt)
1. IF "ENI" → Interrupt vector (006H)
2. IF "DISI" → Next instruction
6.5 Reset and Wake-up
6.5.1 Reset and Wake-up Operation
A reset is initiated by one of the following events:
1. Power-on reset
2. /RESET pin input "low"
3. WDT time-out (if enabled)
The device is kept in reset condition for a period of approximately 18ms3 (except in LXT
mode) after the reset is detected. When in LXT mode, the reset time is 500ms. Two
choices (18ms3 or 4.5ms4) are available for WDT-time out period. Once a reset occurs,
the following functions are performed (the initial address is 000h):
The oscillator continues running, or will be started (if in sleep mode)
The Program Counter (R2) is set to all "0"
3
4
VDD=5V, WDT Time-out period = 16.5ms ± 30%.
VDD=3V, WDT Time-out period = 18ms ± 30%.
VDD=5V, WDT Time-out period = 4.2ms ± 30%.
VDD=3V, WDT Time-out period = 4.5ms ± 30%.
Product Specification (V1.0) 12.01.2006
(This specification is subject to change without further notice)
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ELAN [ ELAN MICROELECTRONICS CORP ]
