Operation; C Bus Data Format - Renesas H8S/2100 Series Hardware Manual

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Section 18 I C Bus Interface (IIC)
18.4

Operation

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The I C bus interface has an I
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18.4.1 I

C Bus Data Format

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The I C bus format is an addressing format with an acknowledge bit. This is shown in figure 18.3.
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
18.4.
Figure 18.5 shows the I
The symbols used in figures 18.3 to 18.5 are explained in table 18.7.
(a) FS = 0 or FSX = 0
S SLA R/W
1 7
1
(b) Start condition retransmission FS = 0 or FSX = 0
S SLA R/W
1 7
1
FS=1 and FSX=1
S
1
Rev. 1.00 Apr. 28, 2008 Page 560 of 994
REJ09B0452-0100
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C bus format and a serial format.
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C bus timing.
A DATA A
1 1 n 1
A DATA
1 1 n1
m1
2
Figure 18.3 I C Bus Data Format (I
DATA DATA
8 n
1
2
Figure 18.4 I C Bus Data Format (Serial Format)
A/A P
1 1
m
A/A S SLA R/W
1 1 7
1
Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2 = from 1)
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C Bus Format)
P
1
m
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m = from 1)
A DATA
1 1 n2
m2
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m = from 1)
A/A P
1 1