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Appendix B Internal I/O Registers
SCSR1—Serial control/status register 1
Bit
7
⎯
Initial value
1
⎯
Read/Write
Note:
*
Only a write of 0 for flag clearing is possible.
Rev.3.00 Jul. 19, 2007 page 476 of 532
REJ09B0397-0300
6
5
SOL
ORER
0
0
R/W
R/(W)
*
Start flag
0
1
Overrun error flag
0 [Clearing condition]
After reading 1, cleared by writing 0
1 [Setting condition]
Set if a clock pulse is input after transfer
is complete, when an external clock is used
Extended data bit
0 Read
SO pin output level is low
1
Write SO pin output level changes to low
1
1
Read SO pin output level is high
1
Write SO pin output level changes to high
1
H'A1
4
3
2
⎯
⎯
⎯
0
0
0
⎯
⎯
⎯
Read
Indicates that transfer is stopped
Write
Invalid
Read
Indicates transfer in progress
Write
Starts a transfer operation
SCI1
(H8/3857 Group only)
1
0
⎯
STF
0
0
⎯
R/W
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