1.2 I²C

I²C is a two-wire protocol. I²C is a multi-host bus that provides arbitration and collision detection. It is half-duplex in communication. Different transfer rates are available depending on the speed mode. The I²C speed rate is higher than the USART, but less than the SPI. I²C is mainly preferred in embedded applications where a limited number of pins are available for communication and several devices must be connected in a single bus.