7549 datasheet(23/73 Pages) RENESAS

23 / 73 page

Rev.2.00

Mar 05, 2007

Page 23 of 70

REJ03B0202-0200

7549 Group

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

Key Input Interrupt (Key-On Wakeup)

A key-on wakeup interrupt request is generated by applying “L”

level to any pin of port P1 that has been set to input mode.

In other words, it is generated when the 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 provided as an active-low key matrix

which uses ports P10 to P13 as input ports.

Fig 21. Connection example when using key input interrupt and port P1 block diagram

Port PXx

level output

Port P1 pull-up control register

bit 7 =

Port P17

latch

Port P17

Direction register =

P17 output

Key input interrupt request

* P-channel transistor for pull-up

** CMOS output buffer

Port P1 pull-up control register

bit 6 =

Port P16

latch

Port P16

Direction register =

P16 output

bit 5 =

Port P15

latch

Port P15

Direction register =

P15 output

bit 4 =

Port P14

latch

Port P14

Direction register =

P14 output

bit 3 =

Port P13

latch

Port P13

Direction register =

P13 input

bit 2 =

Port P12

latch

Port P12

Direction register =

P12 input

bit 1 =

Port P11

latch

Port P11

Direction register =

P11 input

bit 0 =

Port P10

latch

Port P10

Direction register =

P10 input

Falling edge

detection

Falling edge

detection

Falling edge

detection

Falling edge

detection

Falling edge

detection

Falling edge

detection

Falling edge

detection

Falling edge

detection

Port P10 key-on wakeup

selection bit

Port P16 key-on wakeup

selection bit

“L”

“0”

“1”

“0”

Port P1

Input read circuit

Port P17 key-on wakeup

selection bit

Port P1 pull-up control register

Port P14 key-on wakeup

selection bit

Port P13 key-on wakeup

selection bit

Port P12 key-on wakeup

selection bit

Port P1 pull-up control register

Port P11 key-on wakeup

selection bit

Port P15 key-on wakeup

selection bit

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