Rev. 1.00, 09/03, page 491 of 704
17.4 Operation
17.4.1 I
2
C Bus Format
Figure 17.3 shows the I
2
C bus formats. Figure 17.4 shows the I
2
C bus timing. The first frame
following a start condition always consists of 8 bits.
S
SLA
R/
A
DATA
A
A/
P
1
1
1
1
n
7
1
m
(a) I
2
C bus format
(b) I
2
C bus format (start condition retransmission)
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m
≥
1)
S
SLA
R/
A
DATA
1
1
1
n1
7
1
m1
S
SLA
R/
A
DATA
A/
P
1
1
1
n2
7
1
m2
1
1
1
A/
Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2
≥
1)
1
1
Figure 17.3 I
2
C Bus Formats
SDA
SCL
S
1-7
SLA
8
R/
9
A
1-7
DATA
8
9
1-7
8
9
A
DATA
P
A
Figure 17.4 I
2
C Bus Timing
Summary of Contents for H8S/2437
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