3886 datasheet(52/380 Pages) RENESAS

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3886 Group User’s Manual

HARDWARE

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

20, where an interrupt request is generated by pressing one of the

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

P30–P33.

Fig. 20 Connection example when using key input interrupt and port P3 block diagram

FUNCTIONAL DESCRIPTION

✻

✻✻

✻

✻✻

✻

✻✻

✻

✻✻

✻

✻✻

✻

✻✻

✻

✻✻

✻

✻✻

Port P30

latch

Port P30

direction register = “0”

Port P31

latch

Port P31

direction register = “0”

Port P32

latch

Port P32

direction register = “0”

Port P33

latch

Port P33

direction register = “0”

Port P34

latch

Port P34

direction register = “1”

Port P35

latch

Port P35

direction register = “1”

Port P36

latch

Port P36

direction register = “1”

Port P37

latch

Port P37

direction register = “1”

P30 input

P31 input

P32 input

P33 input

P34 output

P35 output

P36 output

P37 output

Port control register 1

Bit 5 = “1”

Port P3

Input reading circuit

Comparator circuit

Port PXx

“L” level output

✻ P-channel transistor for pull-up

✻✻ CMOS output buffer

Key input interrupt request

Port control register 1

Bit 4 = “1”

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