2.11.3 TWI Host Mode Wrongly Detects the Start Bit as a Stop Bit

If TWI is enabled in Host mode followed by an immediate write to the MADDR register, the bus monitor recognizes the Start bit as a Stop bit.

Work Around

Wait for a minimum of two clock cycles from TWI.MCTRLA.ENABLE until TWI.MADDR is written.

Affected Silicon Revisions