Lpc2000

Hello,

bad foul!!! I think there is no software solution (except hacking the
philips bootloader). You could insert a single gate (NAND) into the
/reset signal that disables /reset (=1) while P0.14 (for entering
bootloader programming mode) is low during programming. 

  Sten

--- In lpc2000@yahoogroups.com, "lhaddix" <lhaddix@i...> wrote:
>
> 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
>