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X24C01P-2.7 Datasheet(PDF) 5 Page - IC MICROSYSTEMS |
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X24C01P-2.7 Datasheet(HTML) 5 Page - IC MICROSYSTEMS |
5 / 14 page X24C01 5 WRITE OPERATIONS Byte Write To initiate a write operation, the master sends a start condition followed by a seven bit word address and a write bit. The X24C01 responds with an acknowledge, then waits for eight bits of data and then responds with an acknowledge. The master then terminates the transfer by generating a stop condition, at which time the X24C01 begins the internal write cycle to the nonvolatile memory. While the internal write cycle is in progress, the X24C01 inputs are disabled, and the device will not respond to any requests from the master. Refer to Figure 4 for the address, acknowledge and data transfer sequence. Page Write The most significant five bits of the word address define the page address. The X24C01 is capable of a four byte page write operation. It is initiated in the same manner as the byte write operation, but instead of terminating the transfer of data after the first data byte, the master can transmit up to three more bytes. After the receipt of each data byte, the X24C01 will respond with an acknowledge. After the receipt of each data byte, the two low order address bits are internally incremented by one. The high order five bits of the address remain constant. If the master should transmit more than four data bytes prior to generating the stop condition, the address counter will “roll over” and the previously transmitted data will be overwritten. As with the byte write operation, all inputs are disabled until completion of the internal write cycle. Refer to Figure 5 for the address, acknowledge and data transfer sequence. Figure 4. Byte Write BUS ACTIVITY: SDA LINE BUS ACTIVITY: X24C01 S T A R T WORD ADDRESS (n) S T O P P A C K DATA n R / W L S B S M S B A C K 3837 FHD F09 Figure 5. Page Write BUS ACTIVITY: SDA LINE BUS ACTIVITY: X24C01 S T A R T S S T O P P A C K A C K A C K M S B WORD ADDRESS (n) DATA n DATA n+1 DATA n+3 A C K R / W L S B 3837 FHD F10 |
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