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4. Jumper Setting
I/O addresses and instructions
The table below lists I/O addresses for use as SERIAL2.
Table 4.3.
I/O addresses and instructions
I/O address
DLAB
02F8h
02F9h
02FAh
02FBh
02FCh
02FDh
02FEh
02FFh
32
Read/Write
W
Transmitter holding Register
0
R
Receiver buffer Register
1
W
Divisor latch Register (LSB)
1
W
Divisor latch Register (MSB)
0
W
Interrupt enable Register
X
R
Interrupt ID Register
X
W
Line control Register
X
W
Modem Control Register
X
R
Line status Register
X
R
Modem Status Register
X
R/W
Scratch Register
Register
THR
RBR
DLL
DLM
IER
IIR
LCR
MCR
LSR
MSR
SCR
SPC-8520-LA , SPC-8521-LA
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