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AX10445 Module Series User's Manual
Base Address
0 :
(COM1 - 3F8
COM2 - 2F8)
Base Address +1 :
Base Address +2 :
Base Address +3 :
Base Address +4 :
Base Address +5 :
Base Address +6 :
Figure 4 Registers in the 8250 UART
16
Receiver Buffer/Transmit Holding Register
7
6
bit 7
of
data
Interrupt Enable Register
7
6
0
0
Interrupt Identification Register
7
6
0
0
Line Control Register
7
6
Devisor
Latch
BREAK
000=None, 001=Odd,
Access
Bit
Modem Control Register
7
6
0
0
Line Status Register
7
6
Transmit
Trans.
Holding
0
Reg.
Empty
Empty
Modem Status Register
7
6
RLSD
RI
DSR
5
4
3
5
4
3
Modem
0
0
Status
5
4
3
0
0
0
5
4
3
Parity
011=Even
5
4
3
Loopback
0
OUT2
Test
5
4
3
BREAK
Framing
detected
Error
5
4
3
Delta
CTS
RLSD
2
1
2
1
Transmit
Receive
Holding
Line
Reg.
Available
Status
Empty
2
1
0 means
Interrupt
3-bit Interrupt ID
2
1
Number
Wordlength
of
10-7
Stop Bits
11-8
0-1, 1-2
2
1
OUT1
RTS
Must be 1 for interrupt I/O on PC
2
1
Parity
Overrun
Error
Error
2
1
Delta
Delta
RI
DSR
Technical Reference
0
bit 0
of
data
0
Receive
Data
0
pending
0
0
DTR
0
Receive
Data
Ready
0
Delta
CTS
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