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