This feature can be used to quickly find errors and to implement ACK polling. The ACK bit is used to confirm that the EEPROM has actually written data and therefore reduces the wait time during a write cycle. If the MCU does not receive the logic 0 it expects, it knows that the EEPROM is not responding. During a write cycle, the EEPROM temporarily stores incoming data bytes in its page buffer. When a stop condition ‘P’ is received, the data in the buffer is written to the EEPROM’s non-volatile array. The time required to complete this transfer is called the write cycle time.