EM78P152S datasheet(20/52 Pages) ETC1

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EM78P152/3S

8-Bit Microcontroller with OTP ROM

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Product Specification (V1.8) 09.08.2009

(This specification is subject to change without further notice)

Table 5-1 Usage of Port 6 Input Change Wake-up/Interrupt Function

Usage of Port 6 Input Status Change Wake-up/Interrupt

(I) Wake-up from Port 6 Input Status Change

(II) Port 6 Input Status Change Interrupt

(a) Before Sleep

1. Read I/O Port 6 (MOV R6,R6)

1. Disable WDT

2. Execute “ENI”

2. Read I/O Port 6 (MOV R6,R6)

3. Enable interrupt (Set IOCF.1)

3. Execute "ENI" or "DISI"

4. IF Port 6 change (interrupt)

4. Enable interrupt (Set IOCF.1)

→ Interrupt vector (008H)

5. Execute "SLEP" instruction

(b) After Wake-up

1. IF "ENI"

→ Interrupt vector (008H)

2. IF "DISI"

→ Next instruction

5.5 Reset and Wake-up

5.5.1 Reset

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

(one

oscillator start-up timer period) after a reset is detected. Once a Reset occurs, the

following functions are performed:

The oscillator is running, or will be started.

The Program Counter (R2) is set to all "0."

All I/O port pins are configured as input mode (high-impedance state)

The Watchdog timer and prescaler are cleared.

When power is switched on, the upper 3 bits of R3 are cleared.

The bits of the CONT register are set to all "1" except for Bit 6 (INT flag).

The bits of the IOCB register are set to all "1."

The IOCC register is cleared.

The bits of the IOCD register are set to all "1."

Bit 7 of the IOCE register is set to "1," and Bits 4 and 6 are cleared.

Bits 0 ~ 2 of RF and Bits 0 ~ 2 of IOCF registers are cleared.

2 Vdd = 5V, set up time period = 16.8ms ± 30%

Vdd = 3V, set up time period = 18ms ± 30%

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