On Wed, 28 Aug 2002, Olin Lathrop wrote:

> > Yes, but fiddling with the PSA bit can cause an unintended WDT reset even
> > if it's disabled, apparently.
>
> I find that *very* hard to believe.  Do you have any solid evidence to
> support this belief?

Well, yes, otherwise I wouldn't have said it.  As the OP noted, you can
look at section 11.6.1 on page 11-8 of DS31101A, the PIC Midrange
reference manual.

"NOTE: To avoid an unintended device RESET, the following instruction
sequence (shown in Example 11-1) must be executed when changing the
prescaler assignment from TIMER0 to the WDT.  This sequence must be
followed even if the WDT is disabled."

I'd say that explains why he gets a WDT reset when he manually twiddles
PSA even though he's got the WDT disabled.  I had to look it up to be
sure, but there it is plain as day.

Dale

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