7547 datasheet(13/91 Pages) RENESAS

13 / 91 page

Rev.1.21

Nov 15, 2006

page 13 of 89

REJ03B0156-0121

7547 Group

I/O Ports

[Direction registers] PiD

The I/O ports have direction registers which determine the input/

output direction of each pin. Each bit in a direction register corre-

sponds to one pin, and each pin can be set to be input or output.

When “1” is set to the bit corresponding to a pin, this pin becomes

an output port. When “0” is set to the bit, the pin becomes an in-

put port.

When data is read from a pin set to output, not the value of the pin

itself but the value of port latch is read. Pins set to input are float-

ing, and permit reading pin values.

If a pin set to input is written to, only the port latch is written to and

the pin remains floating.

[Port P0P3 drive capacity control register] DCCR

By setting the Port P0P3 drive capacity control register (address

001516), the drive capacity of the N-channel output transistor for

the port P0 and port P3 can be selected.

[Pull-up control register] PULL

By setting the pull-up control register (address 001616), ports P0

and P3 can exert pull-up control by program. However, pins set to

output are disconnected from this control and cannot exert pull-up

control.

[Port P1P3 control register] P1P3C

By setting the port P1P3 control register (address 001716), a

CMOS input level or a TTL input level can be selected for ports

P10, P12, P13, P36, and P37 by program.

Fig. 12 Structure of port P1P3 control register

Fig. 11 Structure of pull-up control register

Port P1P3 control register

(P1P3C: address 001716, initial value: 0016)

Not used

1 : TTL level

0 : CMOS level

P10,P12,P13 input level selection bit

1 : TTL level

0 : CMOS level

P36/INT1 input level selection bit

1 : TTL level

0 : CMOS level

P37/INT0 input level selection bit

Pull-up control register

(PULL: address 001616, initial value: 0016)

P00 pull-up control bit

P01, P02 pull-up control bit

P03–P07 pull-up control bit

P30 pull-up control bit

P31, P32 pull-up control bit

P33 pull-up control bit

P34, P35 pull-up control bit

P36, P37 pull-up control bit

0 : Pull-up Off

1 : Pull-up On

Note : Pins set to output ports are disconnected from pull-up control.

Port P0P3 drive capacity control register

(DCCR: address 001516, initial value: 0016)

Port P00 drive capacity bit

Ports P01, P02 drive capacity bit

Ports P03–P07 drive capacity bit

Port P30 drive capacity bit

Ports P31, P32 drive capacity bit

Port P33 drive capacity bit

Ports P34, P35 drive capacity bit

Ports P36, P37 drive capacity bit

0 : Low

1 : High

Note: Number of LED drive port (drive capacity is HIGH) is 8-port.

Fig. 10 Structure of port P0P3 drive capacity control register

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