Renesas PCA4738F-80A Instrukcja Użytkownika Pobierz pdf (Strona 19)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

✽ ✽

✽

✽ ✽✽

✽ ✽

✽

Port P8

latch

Port P8

direction register = “0”

Port P8

latch

Port P8

direction register = “0”

Port P8

latch

Port P8

direction register = “0”

Port P8

latch

Port P8

direction register = “0”

Port P8

latch

Port P8

direction register = “1”

Port P8

latch

Port P8

direction register = “1”

Port P8

latch

Port P8

direction register = “1”

Port P8

latch

Port P8

direction register = “1”

input

output

PULL register A

Bit 5 = “1”

Port P8

Input reading circuit

Port PXx

“L” level output

✽ P-channel transistor for pull-up

✽ ✽ 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 P8

0–P83.

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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 63 64

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Renesas PCA4738F-80A Instrukcja Użytkownika Strona 19

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