AME, Inc.

8

Printer Port Cotroller

AT7601F

Rev. B.02

Bit 3 SLIN (PRINTER SELECT INPUT)

This bit is inverted and output onto the SLIN# output. A logic 1 on this bit selects the printer; a logic 0

means the printer is not selected.

Bit 2 INIT# (INITIATE OUTPUT)

A 0 starts the printer (50 microsecond pulse, minimum).

Bit 1 AFD (AUTOFEED)

This bit is inverted and output onto the AFD# output. A logic 1 causes the printer to generate a line feed

after each line is printed. A logic 0 means no autofeed.

Bit 0 STB (STROBE)

A 0.5 microsecond minimum high active pulse clocks data into the printer. Valid data must be present for a

minimum of 0.5 microseconds before and after the strobe pulse. This bit is inverted and output onto the

STB# output.

5-2-3 EPP Address Port

ADDRESS OFFSET = 03H

The address port is available only in EPP mode. Bit definitions are as follows:

The contents of DB0-DB7 are b uffered (non- inverting) and output to ports PD0-PD7 during a write

operation. The leading edge of LOW causes an EPP address write cycle to be performed, and

the trailing edge of LOW latches the data for the duration of the EPP write cycle.

PD0-PD7 ports are read during a read operation. The leading edge of IOR causes and EPP address read

cycle to be performed and the data to be output to the host CPU.

PD0

7

5

6

4

3

2

1

0

PD1

PD2

PD3

PD4

PD5

PD6

PD7