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L9678P 数据表(PDF) 132 Page - STMicroelectronics |
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L9678P 数据表(HTML) 132 Page - STMicroelectronics |
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132 / 203 page  Watchdog timer L9678P, L9678P-S 132/203 DocID029274 Rev 3 8 Watchdog timer This device offers a watchdog implementation by means of a temporal WD. Window times are SPI programmable and a couple of specific codes has to be written within this window in order to serve the WD control. 8.1 Temporal watchdog The temporal watchdog ensures the system software is operating correctly by requiring periodic service from the microcontroller at a programmable rate. This service (watchdog refresh) must occur within a time window, and if serviced too early or too late will enter an error state (WD1_ERROR) reported via the WD1_WDR bit of the FLTSR register. The overall WD1 functionality is described in the state diagram reported in Figure 36. Figure 36. Watchdog state diagram |
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