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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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STM8S Fiches technique(PDF) 125 Page - STMicroelectronics |
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STM8S Fiches technique(HTML) 125 Page - STMicroelectronics |
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125 / 467 page  DocID14587 Rev 14 125/467 RM0016 Independent watchdog (IWDG) 127 Timeout period The timeout period can be configured through the IWDG_PR and IWDG_RLR registers. It is determined by the following equation: where: T = Timeout period TLSI = 1/fLSI P = 2 (PR[2:0] + 2) R = RLR[7:0]+1 The IWDG counter must be refreshed by software before this timeout period expires. Otherwise, an IWDG reset will be generated after the following delay has elapsed since the last refresh operation: D = T + 6 x TLSI where D= delay between the last refresh operation and the IWDG reset. Table 28. Watchdog timeout period (LSI clock frequency = 128 kHz) Prescaler divider PR[2:0] bits Timeout RL[7:0]= 0x00 RL[7:0]= 0xFF /4 0 62.5 µs 15.90 ms /8 1 125 µs 31.90 ms /16 2 250 µs 63.70 ms /32 3 500 µs 127 ms /64 4 1.00 ms 255 ms /128 5 2.00 ms 510 ms /256 6 4.00 ms 1.02 s T2 TLSI P × R × × = |
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