4501 datasheet(120/212 Pages) RENESAS

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2.1 I/O pins

2-3

4501 Group

APPLICATION

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

(3)

Port P2

Port P2 is a 2-bit I/O port.

Also, its key-on wakeup function is switched to ON/OFF by the register K20 and K21, and its pull-

up transistor function is switched to ON/OFF by the register PU20 and PU21.

s Input/output of port P2

q Data input to port P2

Set the output latch of specified port P2i (i=0, 1) to “1” with the OP2A instruction. If the output

latch is set to “0,” “L” level is input.

The state of port P2 is transferred to register A when the IAP2 instruction is executed.

However, port P2 is 2 bits and A2 and A3 are fixed to “0.”

q Data output from port P2

The contents of register A is output to port P2 with the OP2A instruction.

The output structure is an N-channel open-drain.

(4)

Port D

D0–D3 are four independent I/O ports.

Also, as for ports D2 and D3, its key-on wakeup function is switched to ON/OFF by the register K22

and K23, and its pull-up transistor function is switched to ON/OFF by the register PU22 and PU23.

s Input/output of port D

Each pin of port D has an independent 1-bit wide I/O function. For I/O of ports D0–D3, select one

of port D with the register Y of the data pointer first.

q Data input to port D

Set the output latch of specified port Di (i = 0 to 3) to “1” with the SD instruction.

When the output latch is set to “0,” “L” level is input.

When the SZD instruction is executed, if the port specified by register Y is “0,” the next

instruction is skipped. If it is “1,” the next instruction is executed.

q Data output from port D

Set the output level to the output latch with the SD and RD instructions.

The state of pin enters the high-impedance state when the SD instruction is executed.

The states of all port D enter the high-impedance state when the CLD instruction is executed.

The state of pin becomes “L” level when the RD instruction is executed.

The output structure is an N-channel open-drain.

Notes 1: When the SD and RD instructions are used, do not set “01002” or more to register Y.

2: Port D2 is also used as Port C. Accordingly, when using port D2, set the output latch to

“1” with the SCP instruction.

3: Port D3 is also used as Port K. Accordingly, when using port D3, set the output latch to

“1” with the OKA instruction.

4501 Datasheet(PDF) 120 Page - Renesas Technology Corp

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