ST78C34IP40 datasheet(9/21 Pages) EXAR

Part #	ST78C34IP40

Description	GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO

PDF	21 Pages

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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9 / 21 page

6-11

ST78C34

Rev. 3.00

Bit-5

Bit-4

INT output

STR

bit-0

bit-6

Normal mode

-ACK

FIFO empty

FIFO full

FIFO empty

AFR BIT-6:

INT output polarity.

0= Normal. INT output follows the -ACK input

1= Inverted INT output

AFR BIT-7:

FIFO enable / disable function.

0= FIFO is disabled( default mode).

1= FIFO is enabled. Internal 83 byte of FIFO is

enabled.

FIFO BYTE COUNT REGISTER (FBCR)

State and content of the printer FIFO can be moni-

tored by reading this register.

FCBR BIT 0-6:

FIFO byte count. Number of characters left in FIFO.

FCRB bit-0 is the LSB bit of the counter and FCRB bit-

6 is the MSB bit of the counter.

FBCR BIT-7:

FIFO state.

0= FIFO is enabled

1= FIFO is disabled

ST78C34 EXTERNAL RESET CONDITION

SIGNALS

RESET STATE

PD0-PD7

Unknown, output mode

-STROBE

High

-AUTOFDXT

High

INIT

Low

-SLCTIN

High

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