> I'm using a low voltage programmer, so Vpp = Vdd = 5.25V.

Is the low voltage programming enable bit set.

> The 16f87x memory programming
> datasheet (DS39025F) doesn't explicitly state that LVP mode is able to
do a code
> protected bulk erase, however it does say that other than the lower Vpp
voltage and
> dedicating RB3 to programming, "All other specifications for high
voltage ICSP apply".
>
> I'm beginning to think that maybe the code protected bulk erase needs
Vpp at the high
> voltage level (Vdd + 3.5) rather than the low voltage level (Vdd) as
provided by my
> programmer.  I'm going to modify my TLVP to use a higher Vpp (make it a
THVP) and see if
> that solves the problem.  Have you (or anyone else for that matter)
found any
> documentation that says LVP mode can or can't do this kind of erase?

I thought you couldn't erase code protected memory with low voltage
programming, but I just checked the spec and found the same thing you did.
I don't have any experience with low voltage programming.  My programmer
always uses high voltage.


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