Hi Tamas,

I finally settled on the resistor in series. I don
have much room to  implement other isolation methods
on my standard breadboard. I am using 1k Ohms for PGC
and PGD. At times it won't program successfully. I
believe that the DS12887A is interfering at times....
Not sure. Just using my meter for logic testing.... I
ought to improve my programming fixture soon!

Regards,
John

PS: the impedence for the ICD2 PGC and PGD are ~ 31
Ohms after programming the MCU.


--- Tamas Rudnai <tamas.rudnai@gmail.com> wrote:

> Hi John,
> 
> I think the best way is not using these pins at all
> for any other activity
> but if you can't avoid it probably a jumper is the
> best way to disconnect
> the pins from the circuit during the programming.
> Sometimes a resistor would
> do as well and I can imagine a tricky/difficult
> circuit that uses fet for
> example and Vpp or Vdd from the ICSP connector
> controls the gate - but I've
> never done this way and I am not as good as able to
> tell you how it can or
> should be done <grin>.
> 
> Tamas
> 
> 
> 
> On 4/9/07, John Chung <kravnus@yahoo.com> wrote:
> >
> > Tamas,
> >
> >     What kind of isolation do you use for RB6 and
> RB7?
> > I had a VERY long night trying to interface
> DS12887A
> > when it shared the same programming pins.....
> >
> > John
> >
> >
> >
> > --- Tamas Rudnai <tamas.rudnai@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > I still say that if you use that external pullop
> > > with your MCLR you should
> > > use the diode as well - same as in the "In
> Circuit
> > > Serial Programming"
> > > manual:
> > >
> > >
> >
>
http://ww1.microchip.com/downloads/en/DeviceDoc/31028a.pdf
> > >
> > > It's on the 3rd page... it's for the mid-range
> > > family so don't look at other
> > > pins just the MCLR :-)
> > >
> > > Also what I would try:
> > >
> > > - 100k resistor change to 33k or 22k
> > > - put a 100nF decoupler in between Vdd and Vss
> close
> > > to the chip
> > >
> > > It should work for sure, I'm using 10F202 with
> > > PicKit2 - virtually I have no
> > > any problem on programming it, touching wood.
> > >
> > > Tamas
> > >
> > >
> > >
> > >
> > > On 4/9/07, Jinx <joecolquitt@clear.net.nz>
> wrote:
> > > >
> > > > One thing I've noticed, don't know if this is
> > > relevant but it is unusual
> > > > (in my set-up anyway)
> > > >
> > > > With every other MPLAB project I've got, the
> > > Output window comes
> > > > to the foreground during the build, then
> reverts
> > > to the background. This
> > > > 10F project doesn't do that, even though the
> build
> > > is successful and code
> > > > is produced. The project has not been set up
> > > differently to any other
> > > >
> > > > I think I'll update MPLAB. Today is a
> lose-lose
> > > day. Whatever I do is
> > > > going to take time and be a gamble or perhaps
> > > unnecessary. I told the
> > > > customer I should have his prototype done in a
> few
> > > hours, for a meeting
> > > > ASAP this week. And that would have been the
> case
> > > if the 10F had
> > > > worked. But I don't want to make my problem
> his
> > > problem, so I'll have
> > > > to do an emergency port to a 12F. Not a big
> deal,
> > > but the 10F is the
> > > > part for the job and it grates to the same
> thing
> > > twice
> > > >
> > > > And then be totally steamed if the 10F works
> with
> > > a new MPLAB ;-)
> > > >
> > > > --
> > > > http://www.piclist.com PIC/SX FAQ & list
> archive
> > > > View/change your membership options at
> > > >
> http://mailman.mit.edu/mailman/listinfo/piclist
> > > >
> > >
> > >
> > >
> > > --
> > > unPIC -- The PIC Disassembler
> > > http://unpic.sourceforge.net
> > > --
> > > http://www.piclist.com PIC/SX FAQ & list archive
> > > View/change your membership options at
> > > http://mailman.mit.edu/mailman/listinfo/piclist
> > >
> >
> >
> >
> >
> >
> >
>
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> >
> 
> 
> 
> -- 
> unPIC -- The PIC Disassembler
> http://unpic.sourceforge.net
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 



 
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