Lpc2000

Yes, this is the reason for the faulty reset (I discovered myself, 
but thank you all the same).
In my case the TX of the PC RS-232 goes through the drivers and 
apllies a little negative voltage on 3.3V (around -200mV).
This makes (sometimes) the reset fail.


--- In lpc2000@yahoogroups.com, "johnsonnenberg99" 
<johnsonnenberg99@...> wrote:
>
> --- 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.
>