Renesas H8S/2158, User Manual

Page: 537 / 929

Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 483 of 872
REJ09B0286-0300
Bit Bit Name Initial Value R/W Description
2
1
0 BC2
BC1
BC0 0
0
0 R/W
R/W
R/W Bit Counter 2 to 0
These bits specify the number of bits to be transferred
next. With the I
2
C bus format, the data is transferred with
one additional 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
B'000, the setting should be made while the SCL line is
low. The value returns to B'000 when a start condition is
detected or when data transfer including the
acknowledge bit ends.
I
2
C Bus Format Clocked Synchronous Serial Mode
000: 9 bits 000: 8 bits
001: 2 bits 001: 1 bits
010: 3 bits 010: 2 bits
011: 4 bits 011: 3 bits
100: 5 bits 100: 4 bits
101: 6 bits 101: 5 bits
110: 7 bits 110: 6 bits
111: 8 bits 111: 7 bits