Renesas SH7781 - 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.