My little circuit handles that already, i.e. a pullup to VDD allows it to
work and won't be low enough to interfere with the PICSTART.

I use this scheme with PICALL/DIY programmer ($25 USD), all my clients have
those.

--Bob

At 09:38 AM 6/11/2003 -0300, you wrote:
>Thanks Bob,
>
>Just one more question. MCLR is tied up to VDD only when using the
>programmer or should I tied it also during normal operation?
>
>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 09:34
>Para: PICLIST@MITVMA.MIT.EDU
>Assunto: Re: RES: Picstart
>
>
>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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