I ve never managed to get the Mega128 TWI (two wire interface, also called I2C) interface working totally satisfactorily. It seems to require some \"magic numbers\" I suspect it does some wierd clocking tricks which results in strange waveforms

基于TWI(IIC)总线控制的TEA5767数字调频收音机实验程序-Based TWI (IIC) bus control digital FM radio TEA5767 experimental procedure