> > 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.

AFAIK both points are true for some PIC types, or maybe only for some
revisions. I (and Wisp628 users, or maybe it was WISP in those days) had
quite some trouble when the first LVP-capable chips arrived (16F877?).
So in those days (with those chips, and maybe only with those early
revisions) it was realy necessary to keep LVP low, even when doing HVP.
After I added the LVP-pulldown I never heared of that trouble again (but
of course Microchip invented Vpp-before-Vdd :( ). 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
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