ST78C34CP40-F

更新时间： 2024-09-30 13:00:35

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ST78C34CP40-F 数据手册

ST78C34

GENERAL PURPOSE PARALLEL

PRINTER PORT WITH 83 BYTE FIFO

DESCRIPTION

PLCC Package

The ST78C34 is a monolithic Bidirectional Parallel

portdesignedtooperateasageneralpurposeI/Oport.

It contains all the necessary input/output signals to be

configured as a CENTRONICS printer port.

The ST78C34 is a general purpose input/output con-

troller with 83 byte internal FIFO. FIFO operation can

be enabled or disabled. For CENTRONICS printer

operation, all registers are mapped to IBM printer port

registers.

N.C.

INTSEL

N.C.

PD7

37 PD6

The ST78C34 is designed to operate as normal

printer interface without any additional settings. Con-

tents of the FIFO will be cleared after reset or setting

the INIT pin to a low state. The auto FIFO operation

starts after the first -ACK is received from the printer.

Contents of the FIFO transfer to the printer at the

printer loading speed.

PD5

35 PD4

34 PD3

33 PD2

ST78C34CJ44

D3 13

D1 15

PD1

PD0

GND

29 N.C.

N.C.

FEATURES

· 83 bytes of printer output FIFO

· Bi-directional software parallel port

· Bi-directional I/O ports

· Register compatible to IBM XT, AT, compatible

386, 486

· Selectable interrupt polarity

· Selectable FIFO interrupts

ORDERING INFORMATION

Partnumber

Package Operating temperature

ST78C34CJ44

ST78C34CP40 40

ST78C34IJ44

ST78C34IP40

PLCC

PDip

PLCC

PDip

0° C to + 70° C

-40° C to + 85° C

Rev. 3.00

6-3

12 3 4 5 6 7...21

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