Section 15 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Mar. 12, 2008 Page 522 of 1178
REJ09B0403-0100
15.3.12 Modem Status Register (FMSR)
FMSR is a read-only register that indicates the status of or a change in the modem control pins.
Bit
Bit Name
Initial Value R/W
Description
7
DCD
0
R
Data Carrier Detect
Indicates the inverted state of the
DCD
input pin.
6 RI
0
R
Ring
Indicator
Indicates the inverted state of the
RI
input pin.
5
DSR
0
R
Data Set Ready
Indicates the inverted state of the
DSR
input pin.
4
CTS
0
R
Clear to Send
Indicates the inverted state of the
CTS
input pin.
3
DDCD
0
R
Delta Data Carrier Indicator
Indicates a change in the
DCD
input signal after the
DDCD bit is read.
0: No change in the
DCD
input signal after FMSR
read
[Clearing condition]
FMSR read
1: A change in the
DCD
input signal after FMSR read
[Setting condition]
A change in the
DCD
input signal
2
TERI
0
R
Trailing Edge Ring Indicator
Indicates a rise in the
RI
input signal after the TERI
bit is read.
0: No change in the
RI
input signal after FMSR read
[Clearing condition]
FMSR read
1: A rise in the
RI
input signal after FMSR read
[Setting condition]
A rise in the
RI
input pin
Содержание H8S Family
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Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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