Справочник Пользователя для IBM EM78P259N/260N

EM78P259N/260N

8-Bit Microprocessor with OTP ROM

Product Specification

(V1.2) 05.18.2007

• 31

(This specification is subject to change without further notice)

6.4.1 Usage of Port 5 Input Change Wake-up/Interrupt Function

(1) Wake-up

(2) Wake-up and Interrupt

(a) Before Sleep

1. Disable WDT

2. Read I/O Port 5 (MOV R5,R5)

3. Execute "ENI" or "DISI"

4. Enable wake-up bit (Set RE ICWE =1)

5. Execute "SLEP" instruction

5. Enable interrupt (Set IOCF0 ICIE =1)

(b) After wake-up

6. Execute "SLEP" instruction

→ Next instruction

(b) After wake-up

1. IF "ENI"

→ Interrupt vector (006H)

2. IF "DISI"

→ Next instruction

(3) Interrupt

(a) Before Port 5 pin change

1. Read I/O Port 5 (MOV R5,R5)

2. Execute "ENI" or "DISI"

3. Enable interrupt (Set IOCF0 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 under reset condition for a period of approximately 18ms

(except in

LXT mode) after the reset is detected. When in LXT mode, the reset time is 500ms.
Two choices (18ms

or 4.5ms

) 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"

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%.