Acrosser AR-B1551 Manuel d'utilisateur télécharger pdf (Page 14)

AR-B1551 User’s Guide

Desired Baud Rate Divisor Used to Generate 16x Clock

300 384

600 192

1200 96

1800 64

2400 48

3600 32

4800 24

9600 12

14400 8

19200 6

28800 4

38400 3

57600 2

115200 1

Serial Port Divisor Latch

2.6 PARALLEL PORT

(1) Register Address

Port Address Read/Write Register

base + 0 Write Output data

base + 0 Read Input data

base + 1 Read Printer status buffer

base + 2 Write Printer control latch

Registers’ Address

(2) Printer Interface Logic

The parallel port of the W83977F-A is for attaching various devices that accept eight bits of parallel data at

standard TTL level.

(3) Data Swapper

The system microprocessor can read the contents of the printer’s Data Latch through the Data Swapper by reading

the Data Swapper address.

(4) Printer Status Buffer

The system microprocessor can read the printer status by reading the address of the Printer Status Buffer. The bit

definitions are described as follows:

XXX

12345670

-ERROR

SLCT

-ACK

-BUSY

Printer Status Buffer

NOTE: X presents not used.

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Acrosser AR-B1551 Manuel d'utilisateur Page 14