Hitachi H8/3637 Hardware Manual page 343

SCSR1—Serial control/status register 1
Bit
—
Initial value
Read/Write —
Note: * Only a write of 0 for flag clearing is possible.
SDRU—Serial data register U
Bit
SDRU7
Initial value Undefined
Read/Write R/W
342
7 6 5
SOL ORER
1 0 0
R/W
R/(W)
Overrun error flag
0 [Clearing condition]
1 [Setting condition]
Extended data bit
0 Read SO
Write SO
1 Read SO
Write SO
7 6
SDRU6 SDRU5
Undefined Undefined
R/W R/W
Stores transmit and receive data
8-bit transfer mode:
16-bit transfer mode:
4 3
— —
1 1
* — —
Start flag
0 Read Indicates that transfer is stopped
Write Invalid
1 Read Indicates transfer in progress
Write Starts a transfer operation
After reading 1, cleared by writing 0
Set if a clock pulse is input after transfer
is complete, when an external clock is used
pin output level is low
1
pin output level changes to low
1
pin output level is high
1
pin output level changes to high
1
5 4 3
SDRU4 SDRU3
Undefined Undefined
R/W R/W
H'A1
2 1
— —
1 0
— R
H'A2
2 1
SDRU2 SDRU1
Undefined Undefined
R/W R/W
Not used
Upper 8 bits of data
SCI1
0
STF
0
R/W
SCI1
0
SDRU0
Undefined
R/W