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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF8564AUG датащи(PDF) 25 Page - NXP Semiconductors |
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PCF8564AUG датащи(HTML) 25 Page - NXP Semiconductors |
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25 / 48 page  PCF8564A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 3 — 26 August 2013 25 of 48 NXP Semiconductors PCF8564A Real time clock and calendar 10.3 Interface watchdog timer During read/write operations, the time counting circuits are frozen. To prevent a situation where the accessing device becomes locked and does not clear the interface, the PCF8564A has a built in watchdog timer. Should the interface be active for more than 1 s from the time a valid slave address is transmitted, then the PCF8564A will automatically clear the interface and allow the time counting circuits to continue counting. The watchdog will trigger between 1 s and 2 s after receiving a valid slave address. Each time the watchdog period is exceeded, 1 s will be lost from the time counters. The watchdog is implemented to prevent the excessive loss of time due to interface access failure e.g. if main power is removed from a battery backed-up system during an interface access. a. Correct data transfer: read or write b. Incorrect data transfer; read or write Fig 19. Interface watchdog timer |
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