Found the problem, the voltdrop across the 100ohm series resistor I use
with the ICSP caused the problem. I've shorted it out but now I have to
unplug the USB cable every time I program it so as not to have power go
back into the PC and then unplug the programmer every time I connect the
circuit to the PC (Using power from the pc USB ) Has anyone got any
suggestions as to how to get around this inconvenience?
Thanks to all for their input.
Regards
Mark

-----Original Message-----
From: Michael Rigby-Jones [mailto:Michael.Rigby-Jones@BOOKHAM.COM]=20
Sent: 20 January 2004 13:29
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:]18F452 A2D problem

goto    again                   ;back to read
>USB for command loop
>

> That part looks fine.  I'm guessing you have a suitable acquisition
delay
> (around 15us) between setting the channel in ADCON0 and setting the GO
bit?

> One thing to check is that both sets of Vdd/Vss pins are definitely
> connected to their respective supplies, this is just the sort of odd
> behaviour that can occur if only one set of pins is powered.

> Regards

> Mike



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