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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2014 датащи(PDF) 55 Page - STMicroelectronics |
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AN2014 датащи(HTML) 55 Page - STMicroelectronics |
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55 / 65 page  DocID10701 Rev 10 55/65 AN2014 Power supply loss and application reset 64 Figure 44. Emergency sequence I2C products Note: This emergency sequence is detailed in the AN1471. After the emergency sequence, the power supply of the EEPROM (through keep alive systems or a backup capacitor at the EEPROM level) should remain high enough to allow an eventual engaged write cycle to end correctly (tW = 5 ms). SPI products (1 Kbit to 4 Kbit) Emergency procedure to interrupt an SPI request: • Drive the W pin Low while the device is selected. One clock pulse will reset the WEL bit in the Status Register (any current write request will be ignored). • Deselect the EEPROM by driving the S pin High. Warning: If the SPI device is deselected between two data bytes of a write request and W has not been driven Low, a write cycle may be triggered. SPI products (8 Kbit and larger) Emergency procedure to interrupt a SPI request: • drive W pin low while device is selected. Only the WRSR instruction will be ignored, the execution of a Write (to memory) is not discarded by the W pin for 8 Kbit products and larger. • Deselect the EEPROM driving S pin High. Warning: If the chip is deselected between two data bytes of a write request, a write cycle may be triggered. |
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