On Fri, 10 Nov 2000 14:15:50 +0100, you wrote:

>If I implement a "system health scanner", and it detects a corrupted =
register, a routine finding an anomalyty, strange error, or something... =
Then i want to reboot the system immediately rather than wait for =
watchdog.
>
>So I want to effectively assert a hardware reset signal, that is =
guaranteed to reset every pheripheral, also any state that is not =
writeable as register.
>
>(I can make a startup routine that initializes every writeable register =
but... reset seem more confident.)
>
>Is there a way to force true reset, other than connecting reset pin to =
an output pin or wait for watchdog?  Can the Wdog be deliberately =
triggered?
The only way to guarantee a WDT reset is to wait for it. However in
some circumstances you can reduce the _avarage_ WDT reset time. If the
normal WDT prescale is 1, switching to a higher prescale can cause an
immediate WDT reset if the corresponding bit of the prescaler is set.
Setting the WDT prescale value to each value in turn would have a
fairly high probability of causing an immediate WDT reset.=20

ALternatively, you could probably force the prescaler by assigning to
TMR0 with internal clock, waiting until it will have incremented and
then re-assigning it to the WDT.  =20

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