Chapter 8. Serial Controller
65
Interrupt Status Register
Source
0
7
6
5
4
3
2
1
0
Register: Interrupt Status
Address: 2FA, 3FAh
Interrupt
Access: Read
0 Active
0
0
0
INT
1 Inactive
Interrupt Source
000 Modem Status
Clear to send
Data set ready
Ring indicator
Data carrier detect
010 Transmit Buffer
100 Receive Buffer
110 Line Status
Break
Parity
Framing
Overflow
Interrupt Status Register
Line Control Register
7
6
5
4
3
2
1
0
DIV
BRK PTS PTE PEN
STP
Length
Register:
Address:
Access:
Line Control
2FB, 3FBh
Read and Write
Character Length
00 5 bits
01 6 bits
10 7 bits
11 8 bits
Stop Bits
0 1 bit
1 2.0 bits for Length = 6,7,or 8
1.5 bits for Length = 5
Parity Enable
0 No Parity
1 Produce or Check Parity
Parity Selection
0 Odd
1 Even
Parity Stick
0 Disabled
1 Enabled
Break Sequence
0 Do not transmit
1 Transmit
Divisor Latch
0 Disabled
1 Enabled
Line Control Register
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