27.3.2.1.1 Host Initialization

Write the Host Baud Rate (TWIn.MBAUD) register to a value that will result in a valid TWI bus clock frequency. Writing a ‘1’ to the Enable TWI Host (ENABLE) bit in the Host Control A (TWIn.MCTRLA) register will enable the TWI host. The Bus State (BUSSTATE) bit field from the Host Status (TWIn.MSTATUS) register must be set to 0x1 to force the bus state to Idle.