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13.4
Operation
2
The I
C bus interface has an I
2
13.4.1
I
C Bus Data Format
2
The I
C bus format is an addressing format with an acknowledge bit. This is shown in figure 13.3.
The first frame following a start condition always consists of 9 bits.
The serial format is a non-addressing format with no acknowledge bit. This is shown in
figure 13.4.
Figure 13.5 shows the I
The symbols used in figures 13.3 to 13.5 are explained in table 13.6.
(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
FS = 1 and FSX = 1
S
1
2
C bus format and a serial format.
2
C bus timing.
A
DATA
A
1
n
1
A
DATA
A/A
1
n1
m1
2
Figure 13.3 I
C Bus Data Format (I
DATA
DATA
8
n
1
2
Figure 13.4 I
C Bus Data Format (Serial Format)
A/A
P
1
1
m
S
SLA
R/W
1
1
7
1
1
Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2 ≥ 1)
2
C Bus Format)
P
1
m
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m ≥ 1)
A/A
A
DATA
1
n2
m2
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m ≥ 1)
Rev. 1.00, 05/04, page 307 of 544
P
1
1
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