• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 345 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Question about Digital Windowed Watchdog end point

Pashan None
Genius 5660 points

Hello Support,

In the spnu499.pdf, Page 473,

Figure 13-11. Digital Windowed Watchdog Operation Example (25% Window)

I am confused about the WINDOW End Point.

I was assuming the WATCHDOG Counter will always count down to ZERO and restart, so that the WATCHDOG Period is CONSTANT.

NMI or RESET will occur if and only if WATCHDOG KEYS are not written within the WINDOW SIZE.

But in the above mentioned picture I see that COUNTER Preloads before reaching ZERO whenevr the WACTHDOG KEYS are written within the WINDOW Time SLOT.

Is that TRUE or the PCITURE is wrong?

Please help me understand the WINDOWED WATHCDOG Counter Preload Logic when WNDOW Mode is enabled.

Thank you.

Regards

Pashan

 

  • 0
    TI__Mastermind 21850 points

    Pashan,

    The figure is correct and explained in more detail in the previous section 13.2.5.1.

    The exception occurs at a most basic level if the timer expires. That is, "0" does not cause a reload but instead it causes an exception. The other exception sources listed in your post and in the sections 13.2.5.1 and 13.2.5.2 are also valid.

    The periodicity of the watchdog is insured by the periodicity of the servicing, not by the expiration of the counter.

    Regards,

    Forum Support