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> >> if you want to clear *all* the RAM, wouldn't a quick/easy way of
> >> doing it be to tie one pin to MCLR to force a processor reset,
> >> but at the same time, store the current address of the PC to
> >> EEPROM before doing the reset, and have a startup routine that
> >> reloads the PC to the value in the EEPROM?
> >
> >    Wow.
> >
> >    Where's the candle burning through the string, the
> > spring-loaded
> >    trapdoor through which the ball drops, the sprinkling can that
> >    tips over and fills the boot with water, etc.?
> >
> >    -Andy
>
> I can see you have been looking at too many books by Heath Robinson
> :))
>
>
> >    P.S.  By the way, a processor reset doesn't clear the data
> > RAM.
>
> I hadn't checked, but did wonder when I saw the post, if this
> really did happen, seeing as it is not implemented in other
> processors, and besides which, is there a brownout or watchdog
> timer, and if so would these cause the ram to be cleared??? I would
> hope not.

Now, see, if *I* were designing a processor, a reset (i.e. external
or reset instruction) would clear the entire contents of memory.  Any
of these other "resets" are, in fact, irrecoverable interrupts (i.e.
interrupts with a PC (and stack?)  clear), and should be handled as
such.

But, then I don't design processors, now do I?

- --Brendan

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