UPD75238 datasheet(7/190 Pages) NEC

Part #	UPD75238

Description	4 BIT SINGLE-CHIP MICROCOMPUTER

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Manufacturer	NEC [NEC]

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7

µPD75238

1. PIN FUNCTIONS

1.1

PORT PINS (1/2)

Notes 1. The circuits enclosed in circles have a Schmitt-triggered input.

2. An LED can be driven directly.

×

r

With noise elimination function

4-bit input port (port 0).

For P01 to P03, pull-up resistors can be

provided by software in units of 3 bits.

4-bit input port (port 1).

Pull-up resistors can be provided by software

in units of 4 bits.

4-bit I/O port (port 2).

Pull-up resistors can be provided by software

in units of 4 bits.

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

Input/output can be specified bit by bit.

Pull-up resistors can be provided by software

in units of 4 bits.

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

A pull-up resistor can be provided bit by bit

(mask option).

Withstand voltage is 10 V in open-drain mode.

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

A pull-up resistor can be provided bit by bit

(mask option).

Withstand voltage is 10 V in open-drain mode.

Programmable 4-bit I/O port (port 6).

Input/output can be specified bit by bit.

Pull-up resistors can be provided by software

in units of 4 bits.

4-bit I/O port (port 7).

A pull-down resistor can be provided bit by bit

(mask option).

Pin name

B

F

- A

F

- B

M - C

B

- C

E - B

E - C

M

E - C

V

Input

High level

(when a pull-up

resistor is

provided) or

high impedance

High level

(when a pull-up

resistor is

provided) or

high impedance

Input

VSS level (when

a pull-down

resistor is

provided) or

high impedance

When reset

Function

I/ONote 1

circuit

type

I

I/O

INT4

SCK0

SO0/SB0

SI0/SB1

INT0

INT1

INT2

TI0

PTO0

–

PCL

BUZ

–

Also

used as

I/O

P00

P01

P02

P03

P10

P11

P12

P13

P20

P21

P22

P23

P30Note 2

P31Note 2

P32Note 2

P33Note 2

P40-P43Note 2

P50-P53Note 2

P60

P61

P62

P63

P70

P71

P72

P73

8-bit I/O

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