Operation; C Bus Data Format - Renesas H8S/2633 Series Hardware Manual

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
Figure 18-3 I
FS = 1 and FSX = 1
S DATA
1
2
C bus formats.
2
C bus timing.
A DATA A
1 n 1
m
A DATA A/A
1 n1 1
m1
2
C Bus Data Formats (I
DATA
8 n
1 m
2
Figure 18-4 I C Bus Data Format (Serial Format)
A/A P
1 1
n: transfer bit count
(n = 1 to 8)
m: transfer frame count
(m ≥ 1)
S SLA R/W A
1 7 1 1
1
n1 and n2: transfer bit count (n1 and n2 = 1 to 8)
m1 and m2: transfer frame count (m1 and m2 ≥ 1)
2
C Bus Formats)
P
1 n: transfer bit count
(n = 1 to 8)
m: transfer frame count
(m ≥ 1)
DATA A/A P
n2 1 1
m2
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