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18.3
Operation
2
18.3.1
I
C Bus Data Format
2
The I
C bus interface has serial and I
2
The I
C bus formats are addressing formats with an acknowledge bit. These are shown in figures
18-3 (a) and (b). The first frame following a start condition always consists of 8 bits.
The serial format is a non-addressing format with no acknowledge bit. Although start and stop
conditions must be issued, this format can be used as a synchronous serial format. This is shown in
figure 18-4.
Figure 18-5 shows the I
The symbols used in figures 18-3 to 18-5 are explained in table 18-4.
2
(a) I
C bus format (FS = 0 or FSX = 0)
S
SLA
R/W
1
7
1
1
2
(b) I
C bus format (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 formats.
2
C bus timing.
A
DATA
1
n
A
DATA
1
n1
m1
2
Figure 18-3 I
C Bus Data Formats (I
DATA
DATA
8
n
1
2
Figure 18-4 I
C Bus Data Format (Serial Format)
A
A/A
1
1
m
A/A
S
SLA
1
1
7
n1 and n2: transfer bit count (n1 and n2 = 1 to 8)
m1 and m2: transfer frame count (m1 and m2 ≥ 1)
P
1
m
P
1
n: transfer bit count
(n = 1 to 8)
m: transfer frame count
(m ≥ 1)
R/W
A
DATA
1
1
n2
1
2
C Bus Formats)
n: transfer bit count
(n = 1 to 8)
m: transfer frame count
(m ≥ 1)
A/A
P
1
1
m2
719
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