Lpc2000

Robert Adsett wrote:

>At 10:23 AM 2/7/06 +0000, Guillermo Prandi wrote:
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>>>Any chance you've triggered a watchdog or some such?
>>>      
>>>
>>Well, yes... the program might have triggered the watchdog but... why
>>should it matter after the reset pin being low for half a second?
>>    
>>
>
>Truthfully, I don't know.  I only raise the possibility because the User 
>Manual indicates there is an internal flag set by the watchdog so that if 
>it is the source of the interrupt the ISP pin is ignored.  If that flag is 
>not cleared somehow then any subsequent reset could also ignore the 
>pin.  Off hand I wouldn't expect the length of the reset pulse to make any 
>difference on whether it entered ISP mode or not.
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I'd noticed something like that as well.  I played with the watchdog a 
little and found that it didn't work as expected.  IIRC, I had to do a 
powerdown to get the system to run again.  I didn't look further than 
that, as I decided this watchdog thing was going to take some serious 
thought.  It doesn't work as a simple LTC590 monitor...

Probably over-engineered.

Tomw


>If you have an extra pin I'd set it on startup to indicate the startup 
>source.  I seem to remember you can tell that on startup, I hope I'm not 
>confusing the LPC with a different processor.
>
>Robert
>
>" 'Freedom' has no meaning of itself.  There are always restrictions,   be 
>they legal, genetic, or physical.  If you don't believe me, try to chew a 
>radio signal. "  -- Kelvin Throop, III
>http://www.aeolusdevelopment.com/
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-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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