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Appendix
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SPT-100A22TP01, SPT-100A22TP02 Reference Manual (Hardware)
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4.
SERIAL I/O Address and Register
Function
The following table lists the I/O addresses in case of SERIAL A.
I/O Port Addresses
I/O address
DLAB
Read/Write
Register
03F8H
0
W
Transmitter holding register
THR
R
Receive buffer register
RBR
1
W
Divisor latch register (LSB)
DLL
03F9H
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) : The value in bit 7 of the line control register.
Function of Each Register
I/O address
Description
03F8H
03F8H
03F8H
03F9H
Содержание SPT-100A-22TP01
Страница 31: ...31 Hardware Setup This section describes how to install connect and set up the product...
Страница 81: ...Appendix SPT 100A22TP01 SPT 100A22TP02 Reference Manual Hardware 81 I O address Description 03F9H 03FAH...
Страница 82: ...Appendix SPT 100A22TP01 SPT 100A22TP02 Reference Manual Hardware 82 I O address Description 03FBH 03FCH...