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X24012DS Datasheet(PDF) 6 Page - IC MICROSYSTEMS |
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X24012DS Datasheet(HTML) 6 Page - IC MICROSYSTEMS |
6 / 14 page X24012 6 Page Write The X24012 is capable of an four byte page write operation. It is initiated in the same manner as the byte write operation, but instead of terminating the write cycle after the first data word is transferred, the master can transmit up to three more words. After the receipt of each word, the X24012 will respond with an acknowledge. After the receipt of each word, 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 words prior to generating the stop condition, the address counter will “roll over” and the previously written data will be overwritten. As with the byte write operation, all inputs are disabled until completion of the internal write cycle. Refer to Figure 6 for the address, acknowledge and data transfer sequence. Acknowledge Polling The disabling of the inputs, during the internal write operation, can be used to take advantage of the typical 5 ms write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation the X24012 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the X24012 is still busy with the write operation no ACK will be returned. If the X24012 has completed the write operation an ACK will be returned and the master can then proceed with the next read or write operation (See Flow 1). READ OPERATIONS Read operations are initiated in the same manner as write operations with the exception that the R/W bit of the slave address is set to a one. There are three basic read operations: current address read, random read and sequential read. It should be noted that the ninth clock cycle of the read operation is not a “don’t care.” To terminate a read operation, the master must either issue a stop condition during the ninth cycle or hold SDA HIGH during the ninth clock cycle and then issue a stop condition . Flow 1. ACK Polling Sequence 3847 FHD F11 WRITE OPERATION COMPLETED ENTER ACK POLLING ISSUE START ISSUE SLAVE ADDRESS AND R/W = 0 ACK RETURNED? NEXT OPERATION A WRITE? ISSUE BYTE ADDRESS PROCEED ISSUE STOP NO YES YES PROCEED ISSUE STOP NO |
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