ST78C34 查看數據表（PDF） - Exar Corporation

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ST78C34

GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO

Exar Corporation 

ST78C34

Bit-5 Bit-4 INT output STR STR

bit-0 bit-6

0

0 Normal mode 1 -ACK

0

1 FIFO empty 1 FIFO empty

1

0 FIFO full

1 FIFO full

1

1 FIFO empty 0 FIFO empty

ST78C34 EXTERNAL RESET CONDITION

SIGNALS

RESET STATE

PD0-PD7

-STROBE

-AUTOFDXT

INIT

-SLCTIN

Unknown, output mode

High

High

Low

High

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

Rev. 3.00

6-11

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