M38C37ECAFP datasheet(18/62 Pages) MITSUBISHI

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

V V

Port P80

latch

Port P80

direction register = “0”

Port P81

latch

Port P81

direction register = “0”

Port P82

latch

Port P82

direction register = “0”

Port P83

latch

Port P83

direction register = “0”

Port P84

latch

Port P84

direction register = “1”

Port P85

latch

Port P85

direction register = “1”

Port P86

latch

Port P86

direction register = “1”

Port P87

latch

Port P87

direction register = “1”

P80 input

P81 input

P82 input

P83 input

P84 output

P85 output

P86 output

P87 output

PULL register A

Bit 5 = “1”

Port P8

Input reading circuit

Port PXx

“L” level output

V P-channel transistor for pull-up

V V CMOS output buffer

Key input interrupt request

Key Input Interrupt (Key-on Wake-Up)

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

pin of port P8 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 15, where an inter-

rupt request is generated by pressing one of the keys consisted as

an active-low key matrix which inputs to ports P80–P83.

Fig. 15 Connection example when using key input interrupt and port P8 block diagram

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