ST78C36 datasheet(4/27 Pages) EXAR

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ST78C36/36A

ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO

REV. 5.1.0

PRINTER PORT INTERFACE

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

I/O

Bi-directional parallel port (three-state) to transfer data in or out of the

ST78C36 parallel port. PD[7:0] are latched during output mode. Output

only for SPP and PPF modes, bi-directional for all other modes.

-STROBE

Data strobe output (internal pull-up / three stated active low). This output

indicates to the printer that valid data is available at the printer port (PD0-

PD7).

-AUTOFDX

Automatic line feed (internal pull-up / three stated active low). When this

signal is low the printer should automatically line feed after each line is

printed.

INIT

Initialize line printer (internal pull-up / three stated active low). When this

signal is low, it causes the printer to be initialized.

-SLCTIN

Line printer select (internal pull-up / three stated active low). When this

signal is low, it selects the printer.

-ERROR

Line printer error (internal pull-up / active low). This is an output from the

printer to indicate an error by holding it low during error condition.

SLCT

Line printer selected (internal pull-up / active high). This is an output from

the printer to indicate that the line printer has been selected.

BUSY

Line printer busy (internal pull-up / active high). An output from the printer

to indicate printer is not ready to accept data.

-ACK

Line printer acknowledge (internal pull-up / active low). This input is

pulsed low by the printer to indicate that data has been accepted success-

fully.

Line printer paper empty (internal pull-up / active high). An output from the

printer to indicate out of paper.

PDIR

Printer port direction indicator. HIGH indicates device is in input mode,

LOW indicates output mode. (ST78C36CJ44 and ST78C36CQ64 only).

SYSTEM SIGNALS

CLOCK/

XTAL1

Crystal oscillator input (ST78C36ACJ44, ST78C36CQ64) or External

clock input (ST78C36CJ44), nominal 24 MHz.

XTAL2

Crystal oscillator output, nominal 24 MHz. ST78C36ACJ44 and

ST78C36CQ64 only.

RESET

System RESET (active HIGH).

PIN DESCRIPTION

NAME

44-PLCC

64-LQFP

TYPE

DESCRIPTION

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