Hello all,

> Alice Campbell wrote:
> >
> > hello all,
> > yes, im STILL trying to figure out watchdog timeouts and sleep.


> > can anyone tell me:
> > does _mclr and/or watchdog timeout clear the stack? they both seem to
> > return to the origin (reset pointer).

no, but it resets the tris and option registers to ones.


> > If a deliberate timeout loop triggers the dog,  how can i find out
> > whether a call to a timing loop has lost its return, and clear the
> > return if needed?
you cant unless you reinitialize the ports



> >
> > if the watchdog reset and mclr reset clear the stack, why does the
> > pic (16c84) lock up on the first subroutine it encounters?

because you didnt reinitialize theports


> >
> > and finally, why wont it wake up from sleep? i cant shout at it, the
> > rest of the family's asleep.

because you didint reinitialize the ports

> >
> >  the timeout loop is to time the wdt period.  ive looked
> > at appnote tb004 but there seems to be a mistake in it.... they test
> > status for the sequence b'10100101',  but the wdt sequence is
> > b'10110101',  the one they use wont tell sleep from wdt.

it is more subltle than even that.  if wdt is set on _mclr, then it
will think its powerup reset. you have to set a flag on powerup and
read that to distinguish a true powerup from a _mclr   or clrwdt
trigger.


> >
> > and im nearly 46.  built timex z-80 from a kit.  also a ham (ka7dyq)

and can hardly wait to finish the project that ate my brain and go
back to knitting.

>
alice, 46, ka7dyq aka 'mom' de los angeles
hydrogeology & hydrogeochemistry, groundwater modeling,
data analysis, knitting, spinning, homemade marmalade, chutney, beer, &
horehound cough-drops, plein-air paintings (any planet), woodcuts, new at microp
rocessors
'what century IS this, anyway?'