mcs7840 MosChip, mcs7840 Datasheet - Page 16

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

Page 16
MCS7840
USB-2.0 to Four Serial Ports
Modem Control Register (MCR):
This register controls the UART’s fl ow control and self diagnostic features.
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
Bit[7]
DTR-DSR/DCD
Flow Control
Bit
0
1
2
3
4
5
6
7
MCR
Modem Control Register
4
Read/Write
0x00
Bit[6]
Flow Control
Flow Control
Flow Control
Description
Loop-Back
DTR/DSR
Reserved
Reserved
CTS/RTS
Mode
DCD
DTR
RTS
CTS/RTS
Control
Bit[5]
Flow
Loop Back
Logic 0: Forces DTR# output to inactive (high)
Logic 1: Forces DTR# output to active (low)
Logic 0: Forces RTS# output to inactive (high)
Logic 1: Forces RTS# output to active (low)
Reserved
Reserved
Logic 0: Normal operating mode
Logic 1: Enable local Loop-Back Mode
Logic 0: CTS/RTS fl ow control disabled in 550 mode
Logic 1: CTS/RTS fl ow control enabled in 550 mode
Logic 0: DTR/DSR fl ow control disabled in 550 mode
Logic 1: DTR/DSR fl ow control enabled in 550 mode
Logic 0: DCD fl ow control disabled in 550 mode
Logic 1: DCD fl ow control enabled in 550 mode
Internal
Enable
Bit[4]
550 Mode
Reserved
Bit[3]
Operation
Reserved
Bit[2]
Bit[1]
RTS
Rev.
Bit[0]
DTR
1.2