UPD70741GC-25-8EU datasheet(8/112 Pages) NEC

Part #	UPD70741GC-25-8EU

Description	V821TM 32-/16-BIT MICROPROCESSOR

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Manufacturer	NEC [NEC]

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µPD70741

8

(1/2)

1. PIN FUNCTIONS

1.1 Port Pins

Pin name

Input/output

Function

Dual-function pin

P00

Input/output

Port 0

TCLR

P01

10-bit input/output port

DREQ0

P02

Can be set for input/output bit.

DACK0

P03

DREQ1

P04

DACK1

P05

SI

P06

SO

P07

SCLK

P08

TXD/UBE

P09

RXD/TC

Remark After a reset is released, each port pin is set as an input port pin.

1.2 Non-Port Pins

Pin name

Input/output

Function

Dual-function pin

A0-A23

Tristate output

Address bus signal

-

D0-D15

Tristate input/output

Bidirectional data bus signal

-

READY

Input

Bus cycle termination permit signal

-

HLDRQ

Input

Bus mastership request signal

-

HLDAK

Output

Bus mastership permit signal

-

BLOCK

Output

Bus mastership prohibit signal

WDTOUT

MRD

Tristate output

Read strobe signal to memory

-

LMWR

Tristate output

Write strobe signal to lower data in memory

WE

UMWR

Tristate output

Write strobe signal to upper data in memory

-

IORD

Tristate output

Read strobe signal to I/O data

-

IOWR

Tristate output

Write strobe signal to I/O data

-

UBE

Tristate output

Data bus upper data enable signal

TXD/P08

RESET

Input

System reset input

-

X1, X2

Input

Crystal connection/external clock input

-

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