Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 516 of 872
REJ09B0286-0300
17.5
Operation
The I
2
C bus interface has an I
2
C bus format and a serial format.
17.5.1
I
2
C Bus Data Format
The I
2
C bus formats are addressing formats and an acknowledge bit is inserted. The first frame
following a start condition always consists of 9 bits. The I
2
C bus format is shown in figure 17.4.
The serial formats are non-addressing formats with no acknowledge bit inserted. The serial format
is shown in figure 17.5.
The I
2
C bus timing is shown in figure 17.6.
S
A
SLA
7
n
R/
W
DATA
A
1
1
m
1
1
1
A/
A
1
P
1
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m = from 1)
S
SLA
7
n1
7
R/
W
A
DATA
1
1
1
m1
1
A/
A
1
S
1
SLA
R/
W
1
1
m2
A
1
DATA
n2
A/
A
1
P
1
(a) FS = 0 or FSX = 0
(b) Start condition retransmission FS = 0 or FSX = 0
Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2 = from 1)
Figure 17.4 I
2
C Bus Data Formats (I
2
C Bus Formats)
S
DATA
8
n
DATA
1
1
m
P
1
FS = 1 and FSX = 1
Transfer bit count
(n = 1 to 8)
Transfer frame count
(m = from 1)
Figure 17.5 I
2
C Bus Formats (Serial Formats)
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...