mcs7840 MosChip, mcs7840 Datasheet - Page 34

• Manufacturer Part Number: mcs7840
• Description: Usb-2.0 To Four Serial Ports
• Manufacturer: MosChip

Page 34
MCS7840
USB-2.0 to Four Serial Ports
Serial Port (2, 3, & 4) – Device Confi guration Register 0
The Confi guration Registers for these three Serial Ports are all identical.
They are very similar to Serial Port 1, but have a few less confi guration options.
Reserved
DCR0
Bit[7]
[3:2]
[5:4]
Bit
0
1
6
7
Reserved
Reserved
Reserved
Name
Bit[6]
IrDA_
Mode
RTS_
IrDA_
Mode
SDM
RS_
CM
0:
1:
00:
01:
10:
11:
0:
1:
Bit[5]
Do not shut down the transceiver
Even when USB SUSPEND is engaged
Shut down the transceiver
when USB SUSPEND is engaged
RTS is controlled by Control Bit Map.
Signal is active low;
RTS is controlled by Control Bit Map.
Signal is active high;
Drive RTS active
when Downstream Data Buffer is NOT EMPTY;
Otherwise Drive RTS inactive.
Drive RTS inactive
when Downstream Data Buffer is NOT EMPTY;
Otherwise Drive RTS active.
RS-232 / RS-422 / RS-485 Serial Port Mode.
IrDA Mode.
RTS_
CM
Transceiver Shut-Down Mode:
Bit[4]
RTSM RTS Control Method:
RS-232 / RS-422 / RS-485
Defi nition
Reserved
Reserved
Reserved
Bit[3]
Reserved
Bit[2]
Reserved
Bit[1]
Default
Bit[0]
Value
SDM
RS_
00
00
1
0
0
0
Rev.
1.2