16F877A don't start :(

[nquere]

Hie,

OK i will buy a 4mhz osc. My programmer is PicKit 2... :-/

[Glenn]

What software do you use ? "Pickit 2 programmer" or MPLAB IDE ? ..with the later I dont know if the manual settings overrides the settings in the source, I use the Pickit2 software.

I just tried your code, compiled it with

C:\PBP>pbpw -p16f877a blinkit.bas

and loaded the hexfile into the pic with the pickit2 software.

The pic only had a 20MHz xtal between pin 13 and 14, two 22pf caps from both pins to ground and a 10k pullup on ~MCLR, a 470ohm resistor from pin 17 to a LED wich is connectet to ground in the other end. exactly your setup as far as I can see.

And yes, it works here.

[Glenn]

btw the text on my 16F877A also reads "PIC16F877A-I/P" and its 20MHz units, i know coz I ordered it, and I also run them in 20MHz

[The Master]

I had problems with that same PIC not so long ago. Mackrackit posted a solution in post 21 of this thread. It might help here

[Glenn]

yea, but his example works for me without disabling AD-converters and comparators.

[nquere]

Coucou,

Bon j'ai testé avec un autre PIC et apparement tout est OK ! Surement le PIC qui devaient etre foutu...

J'ai testé avec et sans

ADCON1=7 
CMCON=7

et cela fonctionne

Merci à tous !



-----------------

Oups ! To resume, it's OK with an another PIC. I've tested with A/D off and comparator OFF.
I use PIC Flash soft

Thx for your support

[mister_e]

Yup ca fait du sens! Anyways the pin you're using aren't multiplexed with ADCs, or comparator...