Watch dog timer working at room temperature, 25C at 000(the last
three bits ofthe OPTION file register) setting, times out at 18.2ms.
This is tested time. Spec says 18ms. Used PIC16F84 10MHz.

Can anyone tell me where I can a pic 16f84a/p running at 20MHz in
about 1 to 2 weeks.

THanks , TANCM

>>> "Dwornik, Sebastian" <SDwornik@CRSROBOTICS.COM>  27/10/99,
06:03am >>>
So you have completed your design, and now comes the testing.
How do you test such a design to prove that the WDT is working
correctly?

Do you zap the PIC with some electricity and see if it has regained
control correctly?
Flood it with intense noise that is sure to freak out some of its
transistors?

This is where a true hardware ICE probably comes into play (for those
that can afford them).

In addition, can someone explain the drift with regards to
temperature
that a WDT on
a PIC (eg. 16F84) can have?  I would like to understand more of it
and
eventually incorporate
the WDT usage in my designs, but not if its too unstable.

Reliability is the key here.


Thanks.


- Sebastian



> -----Original Message-----
> From: Harold M Hallikainen [SMTP:haroldhallikainen@JUNO.COM]
> Sent: Tuesday, October 26, 1999 12:47 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: watchdog timer
>
>         In terms of computers (including PICs), I don't think it's
a
> question of IF they will crash, but more a question of WHEN they
will
> crash.  Having a WDT allows the system to recover from the crash.
I
> once
> had to drive 100 miles through Kansas in the middle of the night to
> hit
> reset on a system I built to control broadcast transmitters so the
> station could go back on the air at 6am.  EVERYTHING I've built
from
> then
> on includes a watchdog timer...
>
> Harold
>
>
>
> Harold Hallikainen
> harold@hallikainen.com
> Hallikainen & Friends, Inc.
> See the FCC Rules at http://hallikainen.com/FccRules and comments
> filed
> in LPFM proceeding at http://hallikainen.com/lpfm
>
> ___________________________________________________________________
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