M37640E8FP 查看數據表（PDF） - Mitsumi

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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.16 KEY-ON WAKE UP

This device contains a key-on wake up interrupt func-

tion. The key-on wake up interrupt function is one way

of returning from a power-down state caused by the

STP or WIT instructions. This interrupt is generated

by applying low level to any pin of Port P2. If a key

matrix is connected as shown in Figure 1.31, the mi-

crocomputer can be returned to a normal state by

pressing any one of the keys. Key-on wake up is en-

abled in single-chip mode only.

Port PXx

L level output from arbitrary port Xx

P27 output

Pull P2 register

bit 7

P26 output

Pull P2 register

bit 6

P25 output

P24 output

Pull P2 register

bit 5

Pull P2 register

bit 4

P23 input

Pull P2 register

bit 3

P22 input

Pull P2 register

bit 2

P21 input

Pull P2 register

bit 1

P20 input

Off Chip

On Chip

Pull P2 register

bit 0

Fig. 1.31. Port P2 with Key-on Wake up function

Port P27

latch

Port P2

direction

register

bit 7 = 1

Port P26

latch

Port P2

direction register

bit 6 = 1

Port P25

latch

Port P2

direction register

bit 5 = 1

Port P24

latch

Port P2

direction register

bit 4 = 1

Port P23

latch

Port P2

direction register

bit 3 = "0"

Port P22

latch

Port P2

direction register

bit 2 = "0"

Port P21

latch

Port P2

direction register

bit 1 = "0"

Port P20

latch

Port P2

direction register

bit 0 = "0"

Key-on

wake up

Interrupt

Request

29

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