On 5/27/07, Bob Axtell <engineer@neomailbox.com> wrote:
> Matthew Mucker wrote:
> > Greetings fellow hobbyists!
> >
> > I'm returning to the world of PICs after an absence of a few years.  While
> > much has stayed the same I've found a few things that have changed.
> >
> > In particular, the 'F84 seems to have yielded to the 16F628 chip.  I've
> > bought a few of these chips and have dusted off the old P16Pro programmer.
> > >From my reading, some people seem to be suggesting that pin 10 of the PIC
> > must be tied to ground to disable LVP on this device, so that I don't fry my
> > part with high voltage programming.
> >
> > I've read the product's datasheet, and my interpretation of section 14.13 of
> > the datasheet is that this isn't necessary.
> >
> > So I'm asking the community: do I have to ground pin 10 of the part during
> > programming if I'm not using low voltage programming?
> >
> > Thanks,
> >
> > -Matthew
> >
> >
> You must force the LVP pin to GND while programming using high-voltage
> mode, yes.

Hmm. Are you sure ? If you are performing a HVP it does not matter
what you've done with LVP pin as long LVP flag is kept disable.

But a 10K
> resistor to GND will suffice.

Indeed. But is necessary only the LVP bit is enabled and your
programming will be LVP and not HVP.

Vasile
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist