Re: Can program 16F688 but not 18F4431


"Michael Lange" <leckmich@xxxxxxxxxxxxx> wrote in message
news:durts0$k84$1@xxxxxxxxxxxx
Abstract Dissonance schrieb:

Winpic handles that though... you can tell it to raise the Vdd before the
Vpp or after.

Yes, I know, but not the programmer you built!


huh? This makes no sense? The programmer is indepedent of what you call Vdd
or Vpp so it doesn't matter which one is raised first(you could just swap
them).... so I have no clue what you are talking about.

Well, would you have any idea why the PIC18F2455 can be programmed and
the PIC16F688 but neither the PIC184431 or the PIC18F4680 can be
programmed? The only difference is there physical size but by the FLASH
programming documents they all give the same method of programming
them(hardware wise atleast) so I can't understand why the 2455 works but
the other 2 don't(the 688 is a little different but)... The documents
don't state there is any programming different and lumps them all
together, therefor I can't understand why it isn't working... I assume
winpic can handle them since it says it can but I can't find anything
wrong with my circuit either....

I would assume, if say, the larger IC's needed more current or something

Maybe or not.

like that then the docs would mention that... yet it treats them as being
identical, except for pin layout, to the 2455 and others...

If you have a 16F876 or 16F877, this could be an option for you:

http://stolz.de.be/icd/main.html

It is a sipmle clone of the Microchip ICD2 with RS232 port only. I build
it because WinPIC at this time could not programm 18F* and I interestend
in debugguing the chips directly, and because simulation in MPLab is a
little buggy.
The "A" types of the chips (16F876A or 16F877A) works too, but the
firmware must be patched therfore.


I might try it but it still doesn't explain why I can program the 18F2455
but not the 18F4431/4680 and your response above doesn't jive with that.

Michael
--
Schreibt zusammen, was zusammengehört.

Jon


.

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