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.