UPD750004A datasheet(9/84 Pages) NEC

9 / 84 page

µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)

3. PIN FUNCTIONS

3.1

PORT PINS

Notes 1. The circle (

) indicates the Schmitt trigger input.

2. When pull-up resistors that can be specified with the mask option are not incorporated (when pins are used

as N-ch open-drain input ports), the input leak low current increases when an input instruction or bit

operation instruction is executed.

I/O circuit

typeNote 1

-A

-B

-C

E-B

M-D

-A

E-B

When reset

Input

High level (when

pull-up resistors

are provided) or

high impedance

High level (when

pull-up resistors

are provided) or

high impedance

Input

8-bit

I/O

Function

4-bit input port (PORT0).

For P01 - P03, built-in pull-up resistors

can be connected by software in units

of 3 bits.

4-bit input port (PORT1).

Built-in pull-up resistors can be

connected by software in units of 4 bits.

A noise eliminator can be selected only

when the P10/INT0 pin is used.

4-bit I/O port (PORT2).

Built-in pull-up resistors can be

connected by software in units of 4 bits.

Programmable 4-bit I/O port (PORT3).

I/O can be specified bit by bit. Built-in

pull-up resistors can be connected by

software in units of 4 bits.

N-ch open-drain 4-bit I/O port (PORT4).

A pull-up resistor can be provided bit by

bit (mask option). Withstand voltage is

13 V in open-drain mode.

N-ch open-drain 4-bit I/O port (PORT5).

A pull-up resistor can be provided bit by

bit (mask option). Withstand voltage is

13 V in open-drain mode.

Programmable 4-bit I/O port (PORT6).

I/O can be specified bit by bit. Built-in

pull-up resistors can be connected by

software in units of 4 bits.

4-bit I/O port (PORT7).

Built-in pull-up resistors can be

connected by software in units of 4 bits.

2-bit I/O port (PORT8).

Built-in pull-up resistors can be

connected by software in units of 2

bits.

Pin name

P00

P01

P02

P03

P10

P11

P12

P13

P20

P21

P22

P23

P30 - P33

P40 - P43Notes 2

P50 - P53Notes 2

P60

P61

P62

P63

P70

P71

P72

P73

P80

P81

Input/

output

Input

I/O

Input

I/O

Shared

INT4

SCK

SO/SB0

SI/SB1

INT0

INT1

INT2

TI0

PTO0

PTO1

PCL

BUZ

KR0

KR1

KR2

KR3

KR4

KR5

KR6

KR7

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