20.5.4.3.10 When an Address is Invalid

If a 7-bit address does not match the contents of the I2CxADD[6:0] bits, the client will return to an Idle state and ignore any activity on the I²C bus until after the Stop condition.

If the first byte of a 10-bit address does not match the contents of the I2CxADD[9:8] bits, the client will return to an Idle state and ignore all bus activity until after the Stop condition.

If the first byte of a 10-bit address matches the contents of the I2CxADD[9:8] bits, but the second byte of the 10-bit address does not match the I2CxADD[7:0] bits, the client will return to an Idle state and ignore all bus activity until after the Stop condition.