Hi!

Short version:
I really have no clue how the bootloader writes to program memory but...
Does LVP need to be enabled for a bootloader to work?

Long version:
Im using a bootloader from www.microchipc.com for uploading my code to
a 16F877. So far everything has worked just great but now im working on
a project where I need to use the RB3/PGM.

In earlier projects I have tied this to GND sice I don't do LVP
programming. So now I pulled it down instead, configured the pin
as output but it doesn't work.

I read through the datasheet and found this:
"Low Voltage ICSP Programming (LVP) is enabled by default, which
disables the RB3 I/O function. LVP must be disabled to enable RB3
as an I/O pin and allow maximum compatibility to the other 28-pin and
40-pin mid-range devices."

Makes sense but since im using a bootloader the fuses are set there.
No problem, changed the source so LVP is off, recompiled and burned it
and now the bootloader wont't work. No response what so ever.

I verified the new version with the old and the only thing that differs
is the configbit for LVP which now is off.

tia
/Fredrik

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