參數(shù)資料
型號: CD1865
廠商: Intel Corp.
英文描述: Intelligent Eight-Channel Communications Controller
中文描述: 智能八通道通信控制器
文件頁數(shù): 124/150頁
文件大?。?/td> 871K
代理商: CD1865
CD1865
Intelligent Eight-Channel Communications Controller
124
Datasheet
9.4.16
Modem Change Option Register 1
This register is used to define the current state change options to be monitored.
Register Name: MCOR1
Register Description: Modem Change Option Register 1
Default Value: 0
Access: Read/Write
Bit 7
Bit 6
8-Bit Hex Address: $10
Intel Hex Address: $20
Motorola Hex Address: $21
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DSRzd
CDzd
CTSzd
0
DTRth3
DTRth2
DTRth1
DTRth0
Bit
Description
Bit 7
DSRzd is a
1
:
Detect high-to-low voltage transition on DSR* Input (zero-to-one transition of DSR (MSVR)
bit).
Bit 6
CDzd is a
1
:
Detect high-to-low voltage transition on CD* Input (zero-to-one transition of CD (MSVR) bit).
Bit 5
CTSzd is a
1
:
Detect high-to-low voltage transition on CTS* Input (zero-to-one transition of CTS (MSVR)
bit).
Bit 4
Must be a
0
.
Bits 3:0
Defines the threshold level that causes negation of DTR* when this flow-control option is specified. Normally,
this level should be equal to or higher than the service-request level threshold as set in COR3. If it is set lower
than the service-request threshold, it defaults to the service-request threshold level.
DTRth3
DTRth2
DTRth1
DTRth0
Function
0
0
0
0
Automatic DTR mode disabled
0
0
0
1
1 character
0
0
1
0
2 character
0
0
1
1
3 character
0
1
0
0
4 character
0
1
0
1
5 character
0
1
1
0
6 character
0
1
1
1
7 character
1
0
0
0
8 character
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