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AN1336 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN1336 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 10 page AN1336 PFI/PFO operation in a system (how does it work?) Figure 6: Power failure sequence This safeguard window can be used for a number of purposes, depending on the application: Power save The MCU can switch off, one by one, all non-critical peripheral components to conserve energy for safeguard routines. Data transfer The MCU may transfer data from the scratch pad memory to the non-volatile memory. It takes only a few MCU cycles if using NVRAM, but can take several milliseconds when this data needs to be stored in an EEPROM or Flash memory. Scratch pad RAM overwrite Many applications are now required to run encode/decode algorithms (e.g. DES or RCA) for higher security. Therefore it is sometimes preferable to overwrite the working space before power-down to prevent the contents of the RAM from being read illegitimately. Safeguard Window (t2) Reset and/or Write Protect (whichever occurs first) (t1) VCC begins to fall (t0) Power-Fail Input detected - Begin Safeguard Routine VUNREG PFI VCC VPFD t0 t1 t2 t V AI04219 DocID007594 Rev 2 5/10 |
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