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Questions on SDW counters

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The SDW registers 0,2,42,43, and 44 are all system counters that appear to be read only.

They only appear to RESET when the actual unit itself is reset.

Based on some quick calcs, it would seem that SDW0 would elapse after roughly 20 days of continuous running.

My question is, what happens when it does?

My concern is that I have used SDW0 in the past to perform certain timing functions, and it is not uncommon for machines to be left on continously for 20+ days.

Does it simply recycle itself back to zero? Is there some rollover bit that gets set that I can monitor? Does it just stop counting all together?

Is there a way to reset it through the program so that I can prevent it from elapsing?

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