Renesas Hitachi H8S/2194 Series Hardware Manual page 552

Bit 0: Format Select (FS)
Used together with the FSX bit in SARX to select the communication format.
• I
2
C bus format: addressing format with acknowledge bit
• Synchronous serial format: non-addressing format without acknowledge bit, for master
mode only
The FS bit also specifies whether or not SAR slave address recognition is performed in slave
mode.
SAR SARX
Bit 0 Bit 0
FS FSX
0 0
1
1 0
1
Operating Mode
2
I C bus format
• SAR and SARX slave addresses recognized
2
I C bus format
• SAR slave address recognized
• SARX slave address ignored
2
I C bus format
• SAR slave address ignored
• SARX slave address recognized
Clock synchronous serial format
• SAR and SARX slave addresses ignored
(Initial value)
Rev. 2.0, 11/00, page 525 of 1037