參數(shù)資料
型號： TUSB3410VF
英文描述： BUS CONTROLLER
中文描述： 總線控制器
文件頁數(shù)： 53/92頁
文件大?。?/td> 317K
代理商： TUSB3410VF
7
–
7
CTS
MSR
MCR
(4) LCTS
(5) LDSR
(6) LRI
(7) LCD
(5) RTS
(4) DTR
(6) LRI
(7) LCD
(2) LOOP
DSR
RI
DCD
RTS
DTR
Figure 7
–
1. MSR and MCR Registers in Loop-Back Mode
7.1.8
This register provides information about the current state of the control lines from the modem.
MSR: Modem-Status Register (Addr:FFA6)
7
6
5
4
3
2
1
0
LCD
R/O
LRI
R/O
LDSR
R/O
LCTS
R/O
CD
R/C
TRI
R/C
DSR
R/C
CTS
R/C
BIT
0
NAME
CTS
RESET
0
FUNCTION
This bit indicates that the CTS input has changed state. Cleared when the MCU writes a 1 to this bit.
Writing a 0 has no effect.
CTS = 0
CTS = 1
Indicates that the CTS input has changed state since the last time it was read. Clears when the
MCU writes a 1. Writing a 0 has no effect.
This bit indicates that the DSR input has changed state. Cleared when the MCU writes a 1 to this bit.
Writing a 0 has no effect.
DSR = 0
DSR = 1
Indicates that the DSR input has changed state since the last time it was read. Clears when the
MCU writes a 1. Writing a 0 has no effect.
Trailing edge of the ring indicator. This bit indicates that the RI input has changed from low to high. This bit
is cleared when the MCU writes a 1 to this bit. Writing a 0 has no effect.
TRI = 0
TRI = 1
Indicates that an applicable transition has occurred on the RI input.
This bit indicates that the CD input has changed state. Cleared when the MCU writes a 1 to this bit. Writing
a 0 has no effect.
CD = 0
CD = 1
Indicates that the CD input has changed state since the last time it was read.
During loopback, this bit reflects the status of MCR[1] (see Figure 7
–
1)
LCTS = 0
LCTS = 1
CTS input is low
During loop back, this bit reflects the status of MCR[0] (see Figure 7
–
1).
LDSR = 0
LDSR= 1
DSR input is low
During loop back, this bit reflects the status of MCR[2] (see Figure 7
–
1).
LRI = 0
LRI = 1
RI input is low
Indicates no change in the CTS input
1
DSR
0
Indicates no change in the DSR input
2
TRI
0
Indicates no applicable transition on the RI input
3
CD
0
Indicates no change in the CD input
4
LCTS
0
CTS input is high
5
LDSR
0
DSR input is high
6
LRI
0
RI input is high
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