Scratch-Pad Register - Intel IXP45X Developer's Manual

Universal Asynchronous Receiver-Transmitter (UART)—Intel
Product Line of Network Processors
Register Name:
0xC800 X018
Hex Offset Address:
Register
Modem Status Register
Description:
Access: Read Only.
31
Bits
31:8
7
6
5
4
3
2
1
0
14.5.12

Scratch-Pad Register

This read/write register has no effect on the UART. The register is intended as a
scratch-pad register for use by the programmer.
August 2006
Order Number: 306262-004US
(Reserved)
Register
Name
(Reserved)
Data Carrier Detect: This bit is the complement of the Data Carrier Detect
(DCD_N) input.
This bit is equivalent to bit OUT2 of the Modem Control register if LOOP in the
DCD
MCR is set to 1.
0 = DCD_N pin is 1
1 = DCD_N pin is 0
Ring Indicator: This bit is the complement of the ring Indicator (RI_N) input.
This bit is equivalent to bit OUT1 of the Modem Control register if LOOP in the
MCR is set to 1.
RI
0 = RI_N pin is 1
1 = RI_N pin is 0
Data Set Ready: This bit is the complement of the Data Set Ready (DSR_N)
input. This bit is equivalent to bit DTR of the Modem Control register if LOOP in
the MCR is set to 1.
DSR
0 = DSR_N pin is 1
1 = DSR_N pin is 0
Clear to Send: This bit is the complement of the Clear to Send (CTS_N) input.
This bit is equivalent to bit RTS of the Modem Control register if LOOP in the
MCR is set to 1.
CTS
0 = CTS_N pin is 1
1 = CTS_N pin is 0
Delta Data Carrier Detect:
DDCD 0 = No change in DCD_N pin since last read of MSR
1 = DCD_N pin has changed state
Trailing Edge Ring Indicator:
TERI 0 = RI_N pin has not changed from 0 to 1 since last read of MSR
1 = RI_N pin has changed from 0 to 1
Delta Data Set Ready:
DDSR 0 = No change in DSR_N pin since last read of MSR
1 = DSR_N pin has changed state
Delta Clear To Send:
DCTS 0 = No change in CTS_N pin since last read of MSR
1 = CTS_N pin has changed state
Intel
® ®
IXP45X and Intel IXP46X
MSR
0x00000000
Reset Hex Value:
MSR
Description
® ®
IXP45X and Intel IXP46X Product Line of Network Processors
8 7 6 5 4 3 2 1
Developer's Manual
0
773