# Case M3: Address Packet Transmit Complete - Address not Acknowledged by Client

If no client device responds to the address packet, the WIF and the RXACK flags will be set to ‘1’. The clock hold is active at this point, forcing the SCL low.

The missing ACK response can indicate that the I2C client is busy with other tasks or is in a sleep mode and cannot respond.

The software can prepare to take one of the following actions: