M38267EBFS datasheet(24/91 Pages) RENESAS

24 / 91 page

Rev.1.00

Sep 06, 2006

page 24 of 88

REJ03B0181-0100

3826 Group (One Time PROM version)

Key Input Interrupt (Key-on Wake Up)

The key input interrupt is enabled when any of port P2 is set to in-

put mode and the bit corresponding to key input control register is

set to “1”.

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

voltage to any pin of port P2 of which key input interrupt is en-

abled. In other words, it is generated when AND of input level

goes from “1” to “0”. A connection example of using a key input in-

terrupt is shown in Figure 20, where an interrupt request is gener-

ated by pressing one of the keys consisted as an active-low key

matrix which inputs to ports P20–P23.

Fig. 20 Connection example when using key input interrupt and port P2 block diagram

Port P20

latch

Port P20

direction register = “0”

Port P21

latch

Port P21

direction register = “0”

Port P22

latch

Port P22

direction register = “0”

Port P23

latch

Port P23

direction register = “0”

Port P24

latch

Port P24

direction register = “1”

Port P25

latch

Port P25

direction register = “1”

Port P26

latch

Port P26

direction register = “1”

Port P27

latch

Port P27

direction register = “1”

P20 input

P21 input

P22 input

P23 input

P24 output

P25 output

P26 output

P27 output

PULL register A

Bit 7

Port P2

Input reading circuit

Port PXx

“L” level output

✽

P-channel transistor for pull-up

✽ ✽ CMOS output buffer

Key input interrupt request

P27 key input control bit

P26 key input control bit

✽✽ ✽

P25 key input control bit

P24 key input control bit

P23 key input control bit = “1”

PULL register A

Bit 6 = “1”

P22 key input control bit = “1”

P21 key input control bit = “1”

P20 key input control bit = “1”

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