All of the VDD's must be isolated, sorry. Otherwise the PICSTART will be
trying to pump up your onboard power supply thru the chip, and that might
damage the chip.

--Bob

At 09:26 AM 6/11/2003 -0300, you wrote:
>Hi, it looks fine, but when you are using a PIC with multiple VDDs such
>as 18F8720 do I have to connect all VDDs to the socket program? Should
>all of them be isolated?
>
>Thanks
>
>Aryldo
>
>-----Mensagem original-----
>De: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]
>Em nome de Bob Axtell
>Enviada em: quarta-feira, 11 de junho de 2003 09:08
>Para: PICLIST@MITVMA.MIT.EDU
>Assunto: Re: Picstart
>
>
>Yep, it works fine.
>
>I use a quality machine-pin socket and solder the wires right into the
>holes, then run the wires over to the socket, distance not over 6".
>
>One problem is that the PICSTART can't deliver a lot of current, i.e. it
>designed to supply current to one chip only. So if you don't have the
>PIC isolated, you might have problems.
>
>I have enclosed a PDF on how to isolate the PIC from the rest of the
>board, so ANYTHING will program it. It uses a low-drop schottky diode as
>the isolator, so there is NO impact on speed or operation. Be sure the
>have a bypass cap, at least 0.1uF.
>
>Good luck!
>
>--Bob
>
>At 01:54 PM 6/11/2003 +0300, you wrote:
> >Hi
> >
> >Is it possible to use PICSTART Plus as an In circuit serial programmer?
>
> >for example Can we use a properly wired IC socket to obtain and carry
> >programming signals to target board? Does anybody have experience on
> >this? thanx
> >
> >ihsan
> >
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