7220 Datasheet, PDF (199/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
Althogh, the M37220M3-XXXSP/FP has no multi-master I²C-BUS interface, it can control single-master I²C-
BUS by software. Most TV systems can be controlled in this way.
This paragraph explains transmit/receive control example of a single-chip color TV signal processor (M52340SP)
adaptable to the I²C-BUS interface.
5.5.1 Specifications
q Single-chip color TV signal processor required: M52340SP
q Number of transfer bits: 8 bits
q Data format: addressing format
q Pins required: P21, P20
q Direction of data transfer: MSB first
5.5.2 Connection example
P20/SCLK
P21/SOUT
SCL
SDA
M37220M3-XXXSP/FP
<Master>
Fig. 5.5.1 Connection example
SCL
SDA
M52340SP
<Slave>
SCL : Serial clock
SDA : Serial data
5-26
7220 Group User’s Manual