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Section 17 I
2
C Bus Interface 3
R01UH0134EJ0400 Rev. 4.00 Page 859 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
2 to 0 BC[2:0] 000 R/W Bit Counter
These bits specify the number of bits to be transferred
next. When read, the remaining number of transfer bits
is indicated. With the I
2
C bus format, the data is
transferred with one addition acknowledge bit. Should
be made between transfer frames. If these bits are set
to a value other than B'000, the setting should be made
while the SCL pin is low. The bit value returns to B'000
automatically at the end of a data transfer including the
acknowledge bit. And the value becomes B'111
automatically after the stop condition detection. These
bits are cleared by a power-on reset and in software
standby mode and module standby mode. These bits
are also cleared by setting the IICRST bit of ICCR2 to
1. With the clocked synchronous serial format, these
bits should not be modified.
I
2
C Bus Format
000: 9 bits
001: 2 bits
010: 3 bits
011: 4 bits
100: 5 bits
101: 6 bits
110: 7 bits
111: 8 bits
Clocked Synchronous Serial Format
000: 8 bits
001: 1 bit
010: 2 bits
011: 3 bits
100: 4 bits
101: 5 bits
110: 6 bits
111: 7 bits