Functions of Components
IPC-BX/M560(PCW)
44
I/O addresses and instructions
The table below lists I/O addresses for use as COM1.
Table 5.9. I/O Addresses
I/O address DLAB Read/Write
W
Transmitter holding register
THR
03F8H
R
Receiver buffer register
RBR
1
W
Divisor latch register (LSB)
DLL
1
W
Divisor latch register (MSB)
DLM
0
W
Interrupt enable register
IER
03FAH
X
R
Interrupt ID register
IIR
03FBH
X
W
Line control register
LCR
03FCH
X
W
Modem control register
MCR
03FDH
X
R
Line status register
LSR
03FEH
X
R
Modem status register
MSR
03FFH
X
R/W
Scratch register
SCR
DLAB (Divisor Latch Access Bit): Value of bit 7 in the line control register
Register
03F9H
0
Содержание IPC-BX/M560
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