38K2 datasheet(18/151 Pages) RENESAS

18 / 151 page

38K2 Group

Rev.3.00

Oct 15, 2006

page 18 of 147

REJ03B0193-0300

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Port P00

latch

Port P00

direction register = “0”

Port P01

latch

Port P01

direction register = “0”

Port P02

latch

Port P02

direction register = “0”

Port P03

latch

Port P03

direction register = “0”

Port P04

latch

Port P04

direction register = “1”

Port P05

latch

Port P05

direction register = “1”

Port P06

latch

Port P06

direction register = “1”

Port P07

latch

Port P07

direction register = “1”

P00 input

P01 input

P02 input

P03 input

P04 output

P05 output

P06 output

P07 output

PULL 0 register

Bit 7 = “0”

Port P0

Input reading circuit

Port PXx

“L” level output

✽

P-channel transistor for pull-up

✽✽ CMOS output buffer

Key input interrupt request

PULL 0 register

Bit 6 = “0”

PULL 0 register

Bit 5 = “0”

PULL 0 register

Bit 4 = “0”

PULL 0 register

Bit 3 = “1”

PULL 0 register

Bit 2 = “1”

PULL 0 register

Bit 1 = “1”

PULL 0 register

Bit 0 = “1”

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 P0 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 interrupt request is generated by pressing

one of the keys consisted as an active-low key matrix which inputs

to ports P00–P03.

Fig. 15 Connection example when using key input interrupt and port P0 block diagram

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