7 serial status register n (scfsr) – Renesas SH7781 User Manual
Page 1085
21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1055 of 1658
REJ09B0261-0100
21.3.7
Serial Status Register n (SCFSR)
SCFSR is a 16-bit register that consists of status flags that indicate the operating status of the
SCIF.
SCFSR can be always read from or written to by the CPU. However, 1 cannot be written to the
ER, TEND, TDFE, BRK, RDF, and DR flags. Also note that in order to clear these flags they
must be read as 1 beforehand. The FER flag and PER flag are read-only flags and cannot be
modified.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
14
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
DR
RDF
PER
FER
BRK
TDFE
TEND
ER
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
R/W*
R/W*
R
R
R/W*
R/W*
R/W*
R/W*
R
R
R
R
R
R
R
R
BIt:
Initial value:
R/W:
Note: * Only 0 can be written to clear the flag.
Bit Bit
Name
Initial
Value R/W
Description
15 to 8
—
All 0
R
Reserved
These bits are always read as 0. The write value
should always be 0.