Are you trying to program the 16f628 in circuit using MPLAB? Also
mentioned on Jim's pages is that MPLAB can't control the ICSP Vpp
properly. Try using the Warp13 software and see if that helps?

Josh
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Byron A Jeff wrote:
>
> On Fri, Feb 08, 2002 at 10:51:15PM -0800, Donovan Parks wrote:
> > Hello,
> >
> > Thanks for the 'heads up' Kevin.  Could someone who has successfully
> > programmed the 16F628 with ISP please contact me.  Can't get it to go and I
> > don't have a 18 pin ZIF to play with (and am not the keen on modifiying the
> > Warp13 PCB).  Below is listed my connects (can anyone see the problem):
> >
> > PIC to Programmer
> > Pin 5 - Vss to GND
> > Pin 14 -Vdd to Vdd
> > Pin 4 - /MCLR to Vpp
> > Pin 13 - RB7 to RB7
> > Pin 12 - RB6 to RB6
> >
> > ** Pin 10 - RB4/PGM to GND ** (Is this correct?)
>
> Yes. The issue that Jim discussed in the web page below is documented here:
>
> http://www.microchip.com/download/lit/suppdoc/errata/80073d.pdf
>
> It's always best to ground the LVP pin for any PIC device if possible
> especially when programming. This will ensure that only high voltage
> programming is done.
>
> BAJ
> >
> > > Hi Donovan, Yes it is a known problem try
> > > http://users.pipeline.com.au/newfound/trouble%20shoot.htm

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