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User’s Manual U11969EJ3V0UM00
CHAPTER 8 SERIAL INTERFACE FUNCTION
8.4.2 Functions
The following two modes are available for I
2
C bus.
• Operation stop mode
• I
2
C (Inter IC) bus mode (supports multi-master)
(1) Operation stop mode
Used when serial transfer is not carried out, reduces power consumption.
(2) I
2
C bus mode (supports multi-master)
Performs 8-bit data transfer with more than one device, using two lines, each for the serial clock (SCL) and
the serial data bus (SDA).
Conforming to I
2
C bus format, either “start condition”, “data”, or “stop condition” can be output onto serial data
bus in transmission. These data can be automatically detected by hardware in reception.
Because SCL and SDA are open drain outputs, pull-up resistors are required for the serial clock line and the
serial data bus line.
Figure 8-11. Example of Serial Bus Configuration Using I
2
C Bus
SDA
SCL
SDA
+V
DD
SCL
Master CPU2
Slave CPU2
Serial data bus
Serial clock
Address 1
SDA
Slave CPU3
SCL
Address 2
SDA
Slave IC
SCL
Address 3
SDA
Slave IC
SCL
Address N
Master CPU1
Slave CPU1
Address 0
+V
DD
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