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XM28C040M-25 Datasheet(PDF) 8 Page - Xicor Inc. |
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XM28C040M-25 Datasheet(HTML) 8 Page - Xicor Inc. |
8 / 17 page XM28C040 8 RESETTING SOFTWARE DATA PROTECTION Figure 8. Reset Software Data Protection Timing Sequence 3873 FHD F16 3873 FHD F17 Figure 9. Software Sequence to Deactivate Software Data Protection In the event the user wants to deactivate the software data protection feature for testing or reprogramming in an E2PROM programmer, the following six step algo- rithm will reset the internal protection circuit. After tWC, the device will be in standard operating mode. WRITE DATA 55 TO ADDRESS 2AAA WRITE DATA 55 TO ADDRESS 2AAA WRITE DATA 80 TO ADDRESS 5555 WRITE DATA AA TO ADDRESS 5555 WRITE DATA 20 TO ADDRESS 5555 WRITE DATA AA TO ADDRESS 5555 CE WE STANDARD OPERATING MODE VCC DATA ADDR. A0–A16* AA 5555 55 2AAA 80 5555 *A17 & A18 select one of four devices on the module. ≥t WC AA 5555 55 2AAA 20 5555 WAVEFORM INPUTS OUTPUTS Must be steady Will be steady May change from LOW to HIGH Will change from LOW to HIGH May change from HIGH to LOW Will change from HIGH to LOW Don’t Care: Changes Allowed Changing: State Not Known N/A Center Line is High Impedance SYMBOL TABLE |
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