Denny Esterline wrote:
> I'm using a HV programmer and didn't think I needed to ground LVP??

You should always make sure LVP is low during normal high voltage
programming.  Keep in mind that part of normal programming is doing a bulk
erase, which will default the LVP to enabled.  So even though your code may
disable it, it is enabled during most of programming.

The programming specs usually say LVP is irrelevant during high voltage
programming, but that is misleading at best.  I've seen cases where I'm not
so sure that is true.  There are also times the programmer needs to reset
the chip and therefore get into and out of programming mode.  LVP asserted
could case trouble during those times, even if it is then ignored when high
voltage is applied to Vpp.

More information about programming is at
http://www.embedinc.com/picprg/icsp.htm.


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