Panasonic MN101C77C, F77G user manual Xiii 12 Operation

Chapter 13 Serial Interface 4

	Setup Procedure		Description
(5) Set the slave address.			(5) Set the slave address to the upper 7 bits of the
	SC4AD0 (x'3FA3')		SC4AD0 register (I2CAD7-1).
	bp7-1 : I2CAD7-1 = 0110011
(6)	IIC communication start		(6) Master on the IIC bus starts communication.
(7)	Data transmission/reception		(7) When the address transmitted from the master
	confirmation		and the slave address set in the SC4AD1
	SC4STR(x'3FAC')		register match, serial interface 4 interrupt
	bp7	: WRS = 0	(SC4IRQ) is generated.
			In the interrupt routine, make sure the
			communication is the slave transfer by
			verifying that the WRS flag of SC4STR
			register is "0".
(8)	Transmission data setup		(8) Set the transmission data to the SC4TXB
	SC4TXB (x'3FA5')		register.
	bp7-0 : I2CTXB7-0 = x'55'

The transfer rate at IIC communication should be set to under 10 dividing of the system clock.

When master node on the IIC bus issues restart condition at slave transmission, as dummy data, the upper bit should be "1" for transmission data buffer.

XIII - 12 Operation