M38200E3DXXXGP 데이터 시트보기 (PDF) - Renesas Electronics

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M38200E3DXXXGP

Single-chip 8-bit CMOS microcfomputer. PROM 32768 bytes, RAM 1024 bytes. EPROM version

Renesas Electronics 

MITSUBISHI MICROCOMPUTERS

3820 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Key Input Interrupt (Key-on Wake Up)

A key input interrupt request is generated by applying “L” level to

any pin of port P3 that have been set to input mode. In other

words, it is generated when AND of input level goes from “1” to “0”.

An example of using a key input interrupt is shown in Figure 9,

where an interrupt request is generated by pressing one of the

keys consisted as an active-low key matrix which inputs to ports

P20–P23.

P27 output

Port PXx

"L" level output

PULL register A

Bit 2 = "1"

Port P27

direction register = "1"

V

V V Port P27

latch

V

P26 output

Port P26

direction register = "1"

V V Port P26

latch

V

P25 output

V

P24 output

Port P25

direction register = "1"

V V Port P25

latch

Port P24

direction register = "1"

V V Port P24

latch

V

P23 input

Port P23

direction register = "0"

V V Port P23

latch

V

P22 input

Port P22

direction register = "0"

V V Port P22

latch

V

P21 input

Port P21

direction register = "0"

V V Port P21

latch

V

P20 input

Port P20

direction register = "0"

V V Port P20

latch

Key input interrupt request

Port P2

Input reading circuit

V P-channel transistor for pull-up

V V CMOS output buffer

Fig. 10 Connection example when using key input interrupt and port P2 block diagram

20

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