Additional TWI

ATmega328PB has one additional byte-oriented 2-wire serial interface (TWI). There are two TWI peripherals with individual configuration registers. Refer the Register Description section under the TWI - 2-wire Serial Interface module in the ATmega328PB device datasheet for detailed description of these registers. Separate SDA and SDL pins are also available. Refer to section I/O Multiplexing in the ATmega328PB device datasheet for details on the pin mapping for this peripheral.