Lpc2000

> following problem: if we program simple blinking led program into
> LPC2106 flash and then disconnect and re-connect power supply in
> random timely manner on 10 % of the boards sometimes LED doesn't
> start to blink i.e. program is not executing, but after several
> plug/unplugs LED start to blink.

This is just wild guess...

Take one of those "problematic" boards and try this:
Connect three 1N4148 diodes in series from 3.3V to 1.8V.
Also, connect one schottky diode from 1.8V to 3.3V.

Like this:
3.3V    ->|-->|-->|-    1.8V
3.3V    -|<-    1.8V

Keyword is this: Supply Voltage Sequencing and Separation Cautions. Sounds
familiar? No?

OK then... for more detailed explanation of the problem, go to Motorola web
site and download MCF5249UM.pdf document. It is User's Manual for MCF5249
ColdFire processor. Now go to page 409. That's it.

Let us know if this helps since it could be useful for other people who are
using LPC. I'm not using it but everyone else on this group does :))


Regards,
Igor