> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Jan-Erik Soderholm
> Sent: 26 May 2007 22:06
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] Using the P16Pro with LVP parts
> 
> 
> Well, why *not* ground it ? :-)
> 
> It's no major job and as you say, most recomend
> that you do so.
> 
> If I'm not wrong, "LVP-on" is the default status on
> a newly-erased part. So if the LVP pin is floating
> some funny things could happen, even if I think
> that "fry" isn't one of these... :-)
The only issue i have heared reported with using hvp while the PGM pin is floating and LVP is enabled is that sometimes the chip refuses to enter program mode. I belive this is effected by the rise time on Vpp (in my experiance the ICD2 always manages to get the chips into program mode even if the PGM pin is floating).

Taking a chip with LVP disabled into program mode, bulk erasing it (which enables LVP) and reprogramming it (disabling LVP again) seems to work fine with PGM floating even if the programers VPP rise time is slow, you just don't want to leave program mode while LVP is enabled.



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