ST78C34IP40 datasheet(5/21 Pages) EXAR

5 / 21 page

6-7

ST78C34

Rev. 3.00

SYMBOL DESCRIPTION

Symbol

Signal

Pin Description

type

GND

Signal and power ground.

RESET

Master reset (active high). A high on this pin will reset all the

outputs and internal registers.

-STROBE

I/O

General purpose I/O or strobe output (open drain active low, with

internal pull-up). To transfer latched data to the external peripheral

or printer.

-AUTOFDXT

I/O

General purpose I/O or line printer auto feed (open drain active

low, with internal pull-up). To signal the printer for continuous form

feed.

INIT

I/O

General purpose I/O or line printer initialize (open drain active

high, with internal pull-up). To signal the line printer to enter

internal initialization routine.

-SLCTIN

I/O

General purpose I/O or line printer select (open drain active low,

with internal pull-up). To select the line printer.

GND

Power and signal ground.

PD0-PD7

27-34

31-38

I/O

Bi-directional parallel ports (three state). To transfer data in or out

of the ST78C34 parallel port. PD7-PD0 are latched during output

mode.

A0-A1

36-37

40-41

Address lines. To select internal registers.

-IOW

Write strobe (active low). A low on this pin will transfer the contents

of the CPU data bus to the addressed register.

-IOR

Read strobe (active low). A low level on this pin transfers the

contents of the ST78C34 data bus to the CPU.

VCC

Power supply input.

ST78C34IP40 bảng dữ liệu(PDF) 5 Page - Exar Corporation

ST78C34IP40 bảng dữ liệu(HTML) 5 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

bảng dữ liệu tải về

Link URL