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2
Section 17 I
C Bus Interface (IIC)
17.5
Operation
2
The I
C bus interface has an I
2
17.5.1
I
C Bus Data Format
2
The I
C bus formats are addressing formats and an acknowledge bit is inserted. The first frame
following a start condition always consists of 9 bits. The I
The serial formats are non-addressing formats with no acknowledge bit inserted. The serial format
is shown in figure 17.5.
2
The I
C bus timing is shown in figure 17.6.
(a) FS = 0 or FSX = 0
S
SLA
R/W
1
7
1
1
(b) Start condition retransmission FS = 0 or FSX = 0
S
SLA
R/W
1
7
1
1
Figure 17.4 I
FS = 1 and FSX = 1
S
1
Rev. 3.00 Jan 25, 2006 page 516 of 872
REJ09B0286-0300
2
C bus format and a serial format.
A
DATA
A
1
n
1
m
A
DATA
A/A
S
1
n1
1
m1
2
C Bus Data Formats (I
DATA
DATA
8
n
1
2
Figure 17.5 I
C Bus Formats (Serial Formats)
2
C bus format is shown in figure 17.4.
A/A
P
Transfer bit count
(n = 1 to 8)
1
1
Transfer frame count
(m = from 1)
SLA
R/W
A
1
7
1
1
1
Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2 = from 1)
2
C Bus Formats)
P
1
Transfer bit count
(n = 1 to 8)
m
Transfer frame count
(m = from 1)
A/A
P
DATA
1
1
n2
m2
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