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MCS7840
USB-2.0 to Four Serial Ports
Page 36
Rev.
1.2
Serial Port (2, 3, & 4) – Device Configuration Register 2
The Configuration Registers for these three Serial Ports are all identical.
They are very similar to Serial Port 1, but have a few less configuration options.
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Reserved
Reserved
RWU_
Mode
EWU_
Rx
EWU_
DSR
EWU_
RI
EWU_
DCD
EWU_
CTS
DCR2
Bit
Name
Definition
Default
Value
0
EWU_
CTS
Enable Wake Up Trigger on CTS:
0:
Disabled
1:
Enable Wake Up Trigger on CTS State Changes.
0
1
EWU_
DCD
Enable Wake Up Trigger on DCD:
0:
Disabled
1:
Enable Wake Up Trigger on DCD State Changes.
0
2
EWU_
RI
Enable Wake Up Trigger on RI:
0:
Disabled
1:
Enable Wake Up Trigger on RI State Changes.
1
3
EWU_
DSR
Enable Wake Up Trigger on DSR:
0:
Disabled
1:
Enable Wake Up Trigger on DSR State Changes.
0
4
EWU_
Rx
Enable Wake Up Trigger on RXD:
0:
Disabled
1:
Enable Wake Up Trigger on RXD State Changes.
0
5
RWU_
Mode
Remote Wakeup Mode:
0:
Engages Remote Wakeup,
The device issues Disconnect Signal.
1:
engages remote wakeup,
the Device issues resume signal.
1
6
Reserved
Reserved
0
7
Reserved
Reserved
0
Note: Wake up defined above can work only when DCR0[6] = 0 and DCR1[4] = 0.
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