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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT90LS4433-4AI датащи(PDF) 47 Page - ATMEL Corporation |
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AT90LS4433-4AI датащи(HTML) 47 Page - ATMEL Corporation |
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47 / 126 page  47 AT90S/LS4433 1042H–AVR–04/03 Prevent EEPROM Corruption During periods of low V CC, the EEPROM data can be corrupted because the supply volt- age is too low for the CPU and the EEPROM to operate properly. These issues are the same as for board-level systems using the EEPROM, and the same design solutions should be applied. An EEPROM data corruption can be caused by two situations when the voltage is too low. First, a regular write sequence to the EEPROM requires a minimum voltage to operate correctly. Second, the CPU itself can execute instructions incorrectly if the sup- ply voltage for executing instructions is too low. EEPROM data corruption can easily be avoided by following these design recommen- dations (one is sufficient): 1. Keep the AVR RESET active (low) during periods of insufficient power supply voltage. This can be done by enabling the internal Brown-out Detector (BOD) if the operating speed matches the detection level. If not, an external low V CC Reset Protection circuit can be applied. 2. Keep the AVR core in Power-down sleep mode during periods of low V CC. This will prevent the CPU from attempting to decode and execute instructions, effec- tively protecting the EEPROM Registers from unintentional writes. 3. Store constants in Flash memory if the ability to change memory contents from software is not required. Flash memory cannot be updated by the CPU and will not be subject to corruption. |
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