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AS1917R-T Datasheet(PDF) 10 Page - ams AG |
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AS1917R-T Datasheet(HTML) 10 Page - ams AG |
10 / 13 page www.austriamicrosystems.com Revision 0.52 10 - 13 AS1916 - AS1918 austriamicrosystems Data Sheet Watchdog Tips Figure 13 shows a flowchart where the input/output driving the watchdog is set high at the beginning of the routine, set low at the beginning of every subroutine, then set high again when the routine returns to the beginning. If the routine should hang in a subroutine, the problem would quickly be corrected, since the I/O is continually set low and the watch- dog timer is allowed to time out, causing a reset or interrupt to be issued (see Watchdog Input Current on page 9). This method results in higher averaged WDI input current over time than a case where WDI is held low for the majority (87.5%) of the timeout period and periodically pulsing it low-high-low. Figure 13. Example Watchdog Programming Flowchart Start Set WDI High Subroutine or Program Loop Set WDI Low Return Program Code |
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