UPD75402ACT datasheet(7/48 Pages) NEC

7 / 48 page

µPD75402A(A)

PIN FUNCTIONS

3.1

PORT PINS

Remarks 1. The

µPD75402A(A) cannot perform 8-bit I/O with two ports as a pair.

2. See Chapter 8 for each pin status during resetting.

P00

P01

P02

P03

P10

P12

P20

P21

P22

P23

P30 - P33

P50 - P53

P60 - P63

I/O

Input

I/O

Input

I/O

Dual-

function pin

–

SCK

SO/SB0

INT0

INT2

–

PCL

–

Function

4-bit input port (port 0)

P01 to P03 allow the connection of built-in pull-up resistors to be

specified in units of three bits by software.

2-bit input port (port 1)

P10 connects with the built-in noise eliminator using a sampling clock.

P12 connects with the built-in noise eliminator using an analog delay.

P12 allows the connection of built-in pull-up resistor to be specified by

software.

4-bit I/O port (port 2)

Allow I/O specification in units of four bits.

Allow the connection of built-in pull-up resistors to be specified in

units of four bits by software.

Programmable 4-bit I/O port (port 3)

Allow I/O specification bit by bit.

Allow the connection of built-in pull-up resistors to be specified in

units of four bits by software.

Can directly drive LED.

4-bit N-ch open-drain I/O port (port 5)

Allow I/O specification in units of four bits.

Allow the connection of built-in pull-up resistors to be specified bit by

bit by mask option.

Can directly drive LED.

4-bit I/O port (port 6)

Allow I/O specification in units of four bits.

Allow the connection of built-in pull-up resistors to be specified in

units of four bits by software.

Can directly drive LED.

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