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Byte Write For a byte write operation, the device requires the Slave Address Byte and the Word Address Bytes. This gives the master access to any one of the words in the array or CCR. (Note: Prior to writing to the CCR, the master must write a 02h, then 06h to the status regis- ter in preceding operations to enable the write opera- tion. See "Writing to the Clock/Control Registers" on page 6.) Upon receipt of each address byte, the X1240 responds with an acknowledge. After receiving both address bytes the X1240 awaits the eight bits of data. After receiving the 8 data bits, the X1240 again responds with an acknowledge. The master then ter- minates the transfer by generating a stop condition. The X1240 then begins an internal write cycle of the data to the nonvolatile memory. During the internal write cycle, the device inputs are disabled, so the device will not respond to any requests from the master. The SDA output is at high impedance. See Figure 6.