Renesas Hitachi H8S/2194 Series Hardware Manual page 557

Bits 2 to 0: Bit Counter (BC2 to BC0)
Bits BC2 to BC0 specify the number of bits to be transferred next. With the I
(when the FS bit in SAR or the FSX bit in SARX is 0), the data is transferred with one addition
acknowledge bit. Bit BC2 to BC0 settings should be made during an interval between transfer
frames. If bits BC2 to BC0 are set to a value other than 000, the setting should be made while
the SCL line is low.
The bit counter is initialized to 000 by a reset and when a start condition is detected. The value
returns to 000 at the end of a data transfer, including the acknowledge bit.
Bit 2 Bit 1
BC2 BC1
0 0
1
1 0
1
Rev. 2.0, 11/00, page 530 of 1037
Bit 0 Bits/Frame
BC0 Synchronous Serial Format
0 8
1 1
0 2
1 3
0 4
1 5
0 6
1 7
2
C bus format
2
I C Bus Format
9 (Initial value)
2
3
4
5
6
7
8