7220 Datasheet, PDF (194/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.4 Example of I²C-BUS interface control (M37221Mx-XXXSP/FP)
5.4 Example of I²C-BUS interface control (M37221Mx-XXXSP/FP)
The M37221Mx-XXXSP/FP has multi-master I²C-BUS interface. This interface, offering both arbitration lost
detection and synchronous functions, is useful for the multi-master serial communications.
This paragraph explains transmit/receive control example of E²PROM (M6M80012P) adaptable to the I²C-
BUS interface.
For details on the I²C-BUS interface, refer to “2.8 Multi-master I²C-BUS interface.”
5.4.1 Specifications
q E²PROM required: M6M80012P
q Synchronous clock: internal clock
q Standard clock mode: 100 kHz
q Number of transfer bits: 8 bits
q Data format: addressing format
q Pins required: SCL1, SDA1
q Direction of data transfer: MSB first
5.4.2 Connection example
P11/SCL1
P13/SDA1
SCL
SDA
M37221Mx-XXXSP
<Master>
Fig. 5.4.1 Connection example
SCL
SDA
M6M80012P
<Slave>
SCL : Serial clock
SDA : Serial data
7220 Group User’s Manual
5-21