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L99DZ120 データシート(PDF) 68 Page - STMicroelectronics |
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L99DZ120 データシート(HTML) 68 Page - STMicroelectronics |
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68 / 162 page  Application information L99DZ120 68/162 DocID029145 Rev 4 Figure 26. Watchdog with error conditions Figure 27. Watchdog in Flash mode Note: Whenever the device is operated without servicing the mandatory watchdog trigger events, a sequence of 15 consecutive reset events is performed and the device enters the Forced_Vbat_Stby mode with bit FORCED_SLEEP_WD in SR1 set. If the device is woken up after such a forced VBAT_Standby condition and the watchdog is still not serviced, the device, after one long open watchdog window will re-enter the same Forced_Vbat_Stby mode until the next wake up event. In this case, an additional watchdog failure is generated, but the fail counter is not cleared, keeping the maximum number of 15 failures. This sequence is repeated until a valid watchdog trigger event is performed by writing TRIG = 1. |
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