IB Peter Feucht wrote 2011-02-21 09:02:

> When looking at several application notes...

The specifik datashet and the "Memory Programming Specification"
for the PIC12F519 are the docs to read.

> ...I only found the possibility of
> ICSP with Vdd=3D5V! Do I miss something?...

As far as I can see, it as "as usual". The "Bulk Erase" needs at
least 4.5 V (param VDDOK in the Mem Prog Spec). The datashet says
"The Flash data memory is readable and writable during normal
operation (full VDD range)."

Most programmers does a "bulk erase" as part of the programming
cycle (and a bulk erase is the only way I know of to re-program
a protected device).

> My ICSP hardware is a PICStart+ (I
> love it!) with a self made adapter.
>
> To let you know: In series production the PIC is flashed with Vdd=3D5V wh=
en
> the other part is still not attached. And it is much work to disassemble =
it!
>

Bad design ?

> My questions:
>
> Is there a possibility to make flashing with Vdd=3D3,0V on a 12F519?
>

Depends on what "flashing" is. Not "Bulk Erase", of course.

> If possible at all, is it reliable, to just use a voltage divider for Vdd=
,
> ICSPCLK and ICSPDAT? I assume I have to keep the Vpp at those 12,5V (whic=
h
> makes no problem in my case)
>
> Thanks for help and best regards
>
> Peter
>
--=20
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