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MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 35
Serial Port (2, 3, & 4) – Device Configuration Register 1
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
Reserved
RW_
INHB
Tx_I_
PMG
Reserved
DCR1
Bit
Name
Definition
Default
Value
[1:0]
Reserved
Reserved
00
[3:2]
Tx_I_
PMG
These two bits set the output current
of Serial output signals TxD, DTR_n and RTS_n:
00:
6 mA
01:
8 mA (Default)
10:
10 mA
11:
12 mA
01
4
RW_
INHB
RW_INH Remote Wake Inhibit:
0:
Enable the USB Remote Wakeup function
1:
Inhibit the USB Remote Wakeup function
0
5
Reserved
Reserved
0
6
Reserved
Reserved
0
7
Reserved
Reserved
1
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