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artikel:einparkhilfe:blackfin_bf561 [Mon. 13.04.2020 12:53]
go4it [Bootstrap]
artikel:einparkhilfe:blackfin_bf561 [Mon. 13.04.2020 12:54] (aktuell)
go4it [Watchdog]
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 Each ADSP-BF561 core includes a 32-bit timer, which can be used to implement a software watchdog function. A software watchdog can improve system availability by forcing the processor to a known state, via generation of a hardware reset, nonmaskable interrupt (NMI), or general-purpose interrupt, if the timer expires before being reset by software. The programmer initializes the count value of the timer, enables the appropriate interrupt, then enables the timer. Thereafter, the software must reload the counter before it counts to zero from the programmed value. This protects the system from remaining in an unknown state where software, which would normally reset the timer, has stopped running due to an external noise condition or software error. Each ADSP-BF561 core includes a 32-bit timer, which can be used to implement a software watchdog function. A software watchdog can improve system availability by forcing the processor to a known state, via generation of a hardware reset, nonmaskable interrupt (NMI), or general-purpose interrupt, if the timer expires before being reset by software. The programmer initializes the count value of the timer, enables the appropriate interrupt, then enables the timer. Thereafter, the software must reload the counter before it counts to zero from the programmed value. This protects the system from remaining in an unknown state where software, which would normally reset the timer, has stopped running due to an external noise condition or software error.
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 +After a reset, software can determine if the watchdog was the source of the hardware reset by interrogating a status bit in the timer control register, which is set only upon a watchdog generated reset.
 +The timer is clocked by the system clock (SCLK) at a maximum frequency of fSCLK.
  • artikel/einparkhilfe/blackfin_bf561.txt
  • Zuletzt geändert: Mon. 13.04.2020 12:54
  • von go4it