Appendix B Internal I/O Registers
Rev. 6.00 Aug 04, 2006 page 580 of 680
REJ09B0145-0600
SCSR1—Serial Control Status Register 1
H'A1
SCI1
Bit
Initial value
Read/Write
7
1
6
SOL
0
R/W
5
ORER
0
R/(W)
4
1
3
1
0
STF
0
R/W
2
1
1
MTRF
0
R
Extension data bit
Overrun error flag
*
Start flag
0
Transfer operation stopped
Invalid
Transfer operation in progress
Starts transfer operation
1
Read
Write
Read
Write
Note:
*
Only a write of 0 for flag clearing is possible.
0
[Clearing condition]
After reading ORER = 1, cleared by writing 0 to ORER
1
[Setting condition]
When an external clock is used and the clock is input
after transfer is completed
0
SO
1
pin output level is low
Changes SO
1
pin output to low level
SO
1
pin output level is high
Changes SO
1
pin output to high level
1
Read
Write
Read
Write
Tail mark transmission flag
0
Idle state, or 8-bit/16-bit data transfer in progress
1
Tail mark transmission in progress
Содержание H8/38342
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