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CAT24WC66XA-1.8-T2C 데이터시트(PDF) 6 Page - ON Semiconductor |
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CAT24WC66XA-1.8-T2C 데이터시트(HTML) 6 Page - ON Semiconductor |
6 / 11 page CAT24WC66 http://onsemi.com 6 WRITE OPERATIONS Byte Write In the Byte Write mode, the Master device sends the START condition and the slave address information (with the R/W bit set to zero) to the Slave device. After the Slave generates an acknowledge, the Master sends two 8−bit address words that are to be written into the address pointers of the CAT24WC66. After receiving another acknowledge from the Slave, the Master device transmits the data to be written into the addressed memory location. The CAT24WC66 acknowledges once more and the Master generates the STOP condition. At this time, the device begins an internal programming cycle to nonvolatile memory. While the cycle is in progress, the device will not respond to any request from the Master device. Page Write The CAT24WC66 writes up to 32 bytes of data, in a single write cycle, using the Page Write operation. The page write operation is initiated in the same manner as the byte write operation, however instead of terminating after the initial byte is transmitted, the Master is allowed to send up to 31 additional bytes. After each byte has been transmitted, CAT24WC66 will respond with an acknowledge, and internally increment the five low order address bits by one. The high order bits remain unchanged. If the Master transmits more than 32 bytes before sending the STOP condition, the address counter ‘wraps around’, and previously transmitted data will be overwritten. When all 32 bytes are received, and the STOP condition has been sent by the Master, the internal programming cycle begins. At this point, all received data is written to the CAT24WC66 in a single write cycle. Acknowledge Polling Disabling of the inputs can be used to take advantage of the typical write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation, CAT24WC66 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 CAT24WC66 is still busy with the write operation, no ACK will be returned. If CAT24WC66 has completed the write operation, an ACK will be returned and the host can then proceed with the next read or write operation. Write Protection The Write Protection feature allows the user to protect against inadvertent programming of the memory array. If the WP pin is tied to VCC, the top 1/4 of the memory array (locations 1800H to 1FFF) is protected and becomes read only. The CAT24WC66 will accept both slave and byte addresses, but the memory location accessed is protected from programming by the device’s failure to send an acknowledge after the first byte of data is received. Figure 7. Byte Write Timing SLAVE ADDRESS S A C K A C K DATA A C K S T O P P BUS ACTIVITY: MASTER SDA LINE S T A R T BYTE ADDRESS A C K X XX A15−A8 A7−A0 Figure 8. Page Write Timing SLAVE ADDRESS S A C K A C K A C K BUS MASTER SDA LINE S T A R T BYTE ADDRESS DATA n+31 DATA A C K S T O P A C K DATA n A C K P A C K X XX ACTIVITY: A15−A8 A7−A0 READ OPERATIONS The READ operation for the CAT24WC66 is initiated in the same manner as the write operation with one exception, that R/W bit is set to one. Three different READ operations are possible: Immediate/Current Address READ, Selective/ Random READ and Sequential READ. Immediate/Current Address Read The CAT24WC66’s address counter contains the address of the last byte accessed, incremented by one. In other words, if the last READ or WRITE access was to address N, the READ immediately following would access data from |
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