Sony AR-B1570 User Manual
AR-B1570 User’s Guide
13
Desired Baud Rate
Divisor Used to Generate 16x Clock
300 384
600 192
600 192
1200 96
1800 64
2400 48
3600 32
4800 24
9600 12
1800 64
2400 48
3600 32
4800 24
9600 12
14400 8
19200 6
28800 4
38400 3
57600 2
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.
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.
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:
definitions are described as follows:
X
X
X
1
2
3
4
5
6
7
0
-ERROR
SLCT
PE
-ACK
-BUSY
SLCT
PE
-ACK
-BUSY
Printer Status Buffer
NOTE:
X presents not used.