參數(shù)資料
型號: MCS7840
廠商: Electronic Theatre Controls, Inc.
英文描述: USB-2.0 to Four Serial Ports
中文描述: 的USB 2.0 4個串行端口
文件頁數(shù): 17/41頁
文件大小: 447K
代理商: MCS7840
MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 17
Modem Status Register (MSR):
This register provides the status of the modem control lines to CPU.
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
MSR
Modem Status Register
6
Read
0x00
Bit[7]
DCD
Bit[6]
RI
Bit[5]
DSR
Bit[4]
CTS
Bit[3]
Δ
DCD
Bit[2]
Teri
Bit[1]
Δ
DSR
Bit[0]
Δ
CTS
Bit
Description
Operation
0
Delta CTS
Logic 0: No change in the CTS signal
Logic 1: Indicates that the CTS input has changed since
the last time the MSR was read
Logic 0: No change in the DSR signal
Logic 1: Indicates that the DSR input has changed since
the last time the MSR was read
Logic 0: No change in the RI signal
Logic 1: Indicates that the RI input has changed from low
to high since the last time the MSR was read
Logic 0: No change in the DCD signal
Logic 1: Indicates that the DCD input has changed since
the last time the MSR was read
Logic 0: CTS# line is 1
Logic 1: CTS# line is 0
Logic 0: DSR# line is 1
Logic 1: DSR# line is 0
Logic 0: RI# line is 1
Logic 1: RI# line is 0
Logic 0: DCD# line is 1
Logic 1: DCD# line is 0
1
Delta DSR
2
Trailing Edge of RI
3
Delta DCD
4
CTS
5
DSR
6
RI
7
DCD
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