reading I/O state of pic12f675...

[HenrikOlsson]

it seems to me that the PICKIT_ 3 is loading the BOOTloader when the device is changed from PIC18 to PIC12F675...
How to inhibit it ?

You can't. Different device families needs different things from the PICKit3 and it doesn't have enough memory on board to remember it all. So when you switch families (or switch software from which you "run" the PICKit3) it needs to have a different fimrware image loaded.

There's an issue with using the internal oscillator AND GP3 as IO at the same time. The issue is that as soon as power is applied the internal oscillator starts and sets the IO pins up which now prevents the PK3 from "accessing" it in order to enter programming mode. IF you're supplying power to the device externally then try disconnecting that and power the device directly from the PICKit3, if you're running the standalone application for the PICKit3 look for the Vpp before Vdd setting and enable that (if there is one, I don't remember).

If you spend 5 minutes with Google you'll find threads on several forums (including this one) which discusses the issue. For example, here's one

[iw2fvo]

ok, understood the reason of the problem.
Thanks a lot to all.
I did try to recover the chips that are no longer reconized by the programmer. I have a certain numbers dead here.
I applied the indicated procedure but with no succes.
Could anybody instruct about a proven recovery procedure please ?
Thanks again.
regards,
Ambrogio

[fratello]

See link : http://mini12f.blogspot.ro/2013/05/p...iguracion.html
Regards !

[Demon]

I am impressed how well google translated that page to english.

I expected it to look like the documentation I get from asia. (I admit that's better than mandarin or cantonese)

Robert

[iw2fvo]

Thanks, but:
I have a certain number of PIC12f675 that can not programmed anymore because some pin have been re_assigned in the running program.
How to overcome this trouble please ?
What procedure ?
regards,
Ambrogio

[fratello]

Read here : http://www.microchip.com/forums/tm.a...&mpage=2&key=&
It's about 12F629 but ...maybe is useful !

[iw2fvo]

I did try all the suggestion found in the relevant link but no good result at all.
My PICKIT_3 does not reconize the 675 anymore.
Thanks
Ambrogio