Lpc2000

Did anyone else experience the same problem (the LPC2138 stops running and 
the wachdog doesn\ufffdt restart it) ?


----- Original Message ----- 
From: "lhaddix" <lhaddix@...>
To: <lpc2000@yahoogroups.com>
Sent: Monday, October 17, 2005 8:27 AM
Subject: [lpc2000] External watchdog and flash loader


> Hi,
> I'm working on an LPC2138 design and just moved
> into ESD testing. After some ESD hits there was
> no damage, but the processor would be left not
> running.
>
> Implementing the internal watchdog didn't fix this.
>
> Apparently there are ways to nail a 2138 with ESD
> that must stop the processor clock and thus also
> prevent the internal watchdog from working.
>
> My solution is an external supervisor chip with a
> watchdog function that I would keep strobed with
> some line from the micro.
>
> I know this will work because when an ESD hit 'stuns'
> the LPC2138 I can restart it by toggling reset.
>
> The problem is I want to use the internal flash loader
> to do the factory program load for my board.
>
> The flash loader will not keep my external watchdog strobed
> and will not be able to avoid a reset as a result. So the
> external watchdog will keep it from working.
>
> Question: Does the phillips flash loader toggle and pin
> regularly that I could use for this strobe?
>
> Can I hook it somehow to make it pet the dog?
>
> Any ideas?
>
> Landrum
>
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> Yahoo! Groups Links
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