When the device select code is received, the device only responds if the Chip Enable address is the same as the value on its Chip Enable E2,E1,E0 inputs.The 8th bit is the Read/Write bit (RW). This bit is set to 1 for Read and 0 for Write operations.If a match occurs on the device select code, the corresponding device gives an acknowledgment on Serial Data (SDA) during the 9th bit time. If the device does not match the device select code, the device deselects itself from the bus, and goes into Standby mode.