參數(shù)資料
型號： VT8231
廠商： Electronic Theatre Controls, Inc.
元件分類： 晶體
英文描述： CRYSTAL 8.00MHZ 18PF SMD
中文描述： 南橋伏特，PC99柔順
文件頁數(shù)： 58/132頁
文件大?。?/td> 1210K
代理商： VT8231
VT8231
Preliminary Revision 0.8
October 29, 1999
-
52-
Register Descriptions - Super-I/O I/O Ports
7HFKQRORJLHV,QF
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Serial Port 1 Registers
These registers are located at I/O ports which are offsets from
“
COM1Base
”
(index C7h of the Super-I/O configuration
registers). COM1Base is typically set to allow these ports to
be accessed at the standard serial port 1 address range of 3F8-
3FFh.
Port COM1Base+0
–
Transmit / Receive Buffer ............ RW
7-0
Serial Data
Port COM1Base+1
–
Interrupt Enable ........................... RW
7-4
Undefined
..........................................always read 0
3
Interrupt on Hnadshake Input State Change
2
Intr on Parity, Overrun, Framing Error or Break
1
Interrupt on Transmit Buffer Empty
0
Interrupt on Receive Data Ready
Port COM1Base+2
–
Interrupt Status ............................. RO
7-3
Undefined
..........................................always read 0
2-1
Interrupt ID
(0=highest priority)
00 Priority 3 (Handshake Input Changed State)
01 Priority 2 (Transmit Buffer Empty)
10 Priority 1 (Data Received)
11 Priority 0 (Serialization Error or Break)
0
Interrupt Pending
0
Interrupt Pending
1
No Interrupt Pending
Port COM1Base+2
–
FIFO Control ............................... WO
Port COM1Base+3
–
UART Control .............................. RW
7
Divisor Latch Access
0
Select transmit / receive registers
1
Select divisor latch
6
Break
0
Break condition off
1
Break condition on
5-3
Parity
000 None
001 Odd
011 Even
101 Mark
111 Space
2
Stop Bits
0
1
1
2
1-0
Data Bits
00 5
01 6
10 7
11 8
Port COM1Base+4
–
Handshake Control ...................... RW
7-5
Undefined
......................................... always read 0
4
Loopback Check
0
Normal operation
1
Loopback enabled
3
General Purpose Output 2 (unused in VT8231)
2
General Purpose Output 1 (unused in VT8231)
1
Request To Send
0
Disabled
1
Enabled
0
Data Terminal Ready
0
Disabled
1
Enabled
Port COM1Base+5
–
UART Status ................................ RW
7
Undefined
......................................... always read 0
6
Transmitter Empty
0
1 byte in transmit hold or transmit shift register
1
0 bytes transmit hold and transmit shift regs
5
Transmit Buffer Empty
0
1 byte in transmit hold register
1
Transmit hold register empty
4
Break Detected
0
No break detected
1
Break detected
3
Framing Error Detected
0
No error
1
Error
2
Parity Error Detected
0
No error
1
Error
1
Overrun Error Detected
0
No error
1
Error
0
Received Data Ready
0
No received data available
1
Received data in receiver buffer register
Port COM1Base+6
–
Handshake Status ........................ RW
7
DCD Status (1=Active, 0=Inactive)
6
RI Status (1=Active, 0=Inactive)
5
DSR Status (1=Active, 0=Inactive)
4
CTS Status (1=Active, 0=Inactive)
3
DCD Changed (1=Changed Since Last Read)
2
RI Changed (1=Changed Since Last Read)
1
DSR Changed (1=Changed Since Last Read)
0
CTS Changed (1=Changed Since Last Read)
Port COM1Base+7
–
Scratchpad .................................... RW
7
Scratchpad Data
Port COM1Base+9-8
–
Baud Rate Generator Divisor .. RW
15-0 Divisor Value for Basud Rate Generator
Baud Rate = 115,200 / Divisor
(e.g., setting this register to 1 selects 115.2 Kbaud)
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