7513 datasheet(24/66 Pages) RENESAS

24 / 66 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

7513 Group

Key Input Interrupt (Key-on wake-up)

A Key-on wake up interrupt request is generated by applying a

falling edge to any pin of port P2 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 18, 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.

Fig. 18 Connection example when using key input interrupt and port P2 block diagram

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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 P27

latch

Port P27

direction register = “1”

Port P20

input

Port P21

input

Port P22

input

Port P23

input

Port P24 output

Port P25 output

Port P26 output

Port P27 output

PULLA register

Bit 2 = “1”

Port P2 input

reading circuit

Key input interrupt request

Port PXx

“L” level output

✽ P-channel transistor for pull-up

✽✽ CMOS output buffer

Key input control register = “1”

Port P26

direction register = “1”

Key input control register = “1”

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