Lpc2000

--- In lpc2000@yahoogroups.com, mfrazier@... wrote:
>
> Have you looked at the comm lines and ground with a scope for the 
presence 
> of excessive noise?
> 
> [Non-text portions of this message have been removed]
>

I had a similar problem last month.  A small amount of current got 
through the RS232 driver chip and into the 3.3V power rail, so that 
when the DC power to the CPU was off, it did not go to 0V.  The CPU 
must go down to 0V when it is powered off, and if it drifts around .5-
1V, something internal to the CPU latches up.  You can put a pull-down 
resistor on the 3.3V to verify that this is the issue.