Hitachi H8/3937 Series Hardware Manual page 448

SCSR1—Serial control status register 1
Bit 7
—
Initial value 1
Read/Write —
Note: * Only a write of 0 for flag clearing is possible.
436
6 5
SOL ORER —
0 0
R/W R/(W) —
*
Start flag
0
1
Tail mark transmission flag
0 Idle state, or 8-bit/16-bit data transfer in progress
1 Tail mark transmission in progress
Overrun error flag
0 Clearing conditions:
After reading ORER = 1, cleared by writing 0 to ORER
1 Setting conditions:
When an external clock is used and the clock is input
after transfer is completed
Extension data bit
0 Read SO output level is low
1
Write Changes SO
1 Read SO output level is high
1
Write Changes SO
H'A1
4 3 2
— —
1 1 1
— —
Read Transfer operation stopped
Write Invalid
Read
Transfer operation in progress
Write Starts transfer operation
output to low level
1
output to high level
1
SCI1
1 0
MTRF STF
0 0
R R/W