Rev. 2.0, 11/00, page 530 of 1037
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
2
C bus format
(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
Bit 0
Bits/Frame
BC2
BC1
BC0
Synchronous Serial Format
I
2
C Bus Format
0
8
9 (Initial value)
0
1
1
2
0
2
3
0
1
1
3
4
0
4
5
0
1
5
6
0
6
7
1
1
1
7
8
Summary of Contents for Hitachi H8S/2191
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