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L9678P Datasheet(PDF) 132 Page - STMicroelectronics

No. de pieza L9678P
Descripción Electrónicos  Automotive user configurable airbag IC
PDF  203 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 132 Page - STMicroelectronics

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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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