> Van: mahfoud rahal <mahfoud_rahal@HOTMAIL.COM>
> Aan: PICLIST@MITVMA.MIT.EDU
> Onderwerp: PIC 16C84 Bulk Erase
> Datum: zondag 24 januari 1999 17:27
>
> Hi,

Hello mahfoud,

> I'm working on a PIC16C84 programmer project. All programming commands
> given in DS30189D documentation from Microchip are working fine except
> for "BULK ERASE PROGRAM MEMORY" and "BULK ERASE DATA MEMORY"
>witch are  001001 and 001011 respectively.
>
> For example, in chapter 2.3.1.8 (BULK ERASE PROGRAM MEMORY)
> the doc says:
> 1- Do a "Load Data All 1's" command
> 2- Do a "Bulk Erase User Memory" command
> 3- Do a "Begin programming command"
> 4- Wait 10 ms to complete bulk erase
>
> When I read back the chip, no location of the Prog Mem changed,
> am'I missing something or is there some mistakes in DS30190D.
> Any idea ?

Yes.  It's a problem MicroChip does not have the solution for ... I talked
with the person who wrote the article & asked him to check it.  He
recommended to use the "Erase protected code" method.  You don't have to.
Just exchange steps 2 & 3.  It does not make sense, but it works.

> Note: I can do the equivalent operation by writing 3FFF in all program
> memory locations but this consumes much more time.

And it is counted as a full programming-cycle.  So a full
Erase-and-programming step will count as _two_ programming steps, chopping
the number of times you can re-program your EEPROM in HALF !

> Thanks for your time and attention.

You're welcome.

Greetz,
  Rudy Wieser