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X28HC64SMB-12 Datasheet(PDF) 7 Page - Xicor Inc. |
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X28HC64SMB-12 Datasheet(HTML) 7 Page - Xicor Inc. |
7 / 24 page X28HC64 7 SOFTWARE DATA PROTECTION Figure 6. Timing Sequence—Byte or Page Write 3857 FHD F16 Figure 7. Write Sequence for Software Data Protection Regardless of whether the device has previously been protected or not, once the software data protection algorithm is used, the X28HC64 will automatically dis- able further writes unless another command is issued to deactivate it. If no further commands are issued the X28HC64 will be write protected during power-down and after any subsequent power-up. Note: Once initiated, the sequence of write operations should not be interrupted. 3857 FHD F17 CE WE (VCC) WRITE PROTECTED VCC 0V DATA ADDR AA 1555 55 0AAA A0 1555 ≤t BLC MAX WRITES OK BYTE OR PAGE tWC WRITE LAST BYTE TO LAST ADDRESS WRITE DATA 55 TO ADDRESS 0AAA WRITE DATA A0 TO ADDRESS 1555 WRITE DATA XX TO ANY ADDRESS AFTER tWC RE-ENTERS DATA PROTECTED STATE WRITE DATA AA TO ADDRESS 1555 BYTE/PAGE LOAD ENABLED OPTIONAL BYTE OR PAGE WRITE ALLOWED |
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