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with 10MHZ crystal result in 312KHz in
while loop. Should not it be: 10MHz crystal div/4 (in the PIC internal divider)= 2.5Mhz?

In a word, no. While there is only one C statement in the loop, ther ...

what caps are you using for the xtal?
does another xtal work
can you scope the xtal pin to confirm it's oscillating ?

does the PIC run on internal ?

I'm using 15 pF caps
I used 10Mhz resonato ...

In my project the PIC18F4620, with 10MHZ crystal result in 312KHz in
while loop. Should not it be: 10MHz crystal div/4 (in the PIC internal divider)= 2.5Mhz?

CCS PCH C Compiler, Version 5.015, xx ...

I installed compiler vs. 5.015 and shortened your program down to the
essential parts to read and display the ADC results. It worked. The
upper 6 bits are set to 0 by the compiler without any mas ...

Your clock divisor is too small, resulting in a ADC clock that is 8 times
faster than allowed.

#use delay(internal=8000000,RESTART_WDT)

setup_adc(ADC_CLOCK_DIV_2);

The 12F683 data sheet ...

The problem was in the unused bits of the 6 var test ( int16 ) que was filled with 1 instead 0. Its unknown why, but I used a bitmask to correct this.
Here is the complete code:

#include <12F6 ...

I do not know exactly what's going on but I cleaned the bits 10-15 of the teste var and it worked fine! it's ok! The PWM and the value of var test have the same

The code was:

bit_clear(teste,1 ...

Thank You PCM programmer to reply, the voltage is +5V DC to the pic and 0 to 5.07 DC (from the potentiometer) to AD. I know what is RMS, in my previous project I was using AC and my oscilloscope was i ...

This is a Microchip issue. The Microchip forum is the best place to look.

Someone offers an explanation near the end of this thread.
It's about using the PicKit 2. Apparently the PicKit 2 has
...

To simplify the tests and eliminate variables I created another code, compiled in another version of CCS (4.068) and with another PIC (PIC12F675).

The problem continues...

#include <12F675.h& ...

the max value of A/D (10 bits) is 65534 instead 1023
Where in your program do you get the value of 65534 ?
I don't see any printf statement to display the ADC value.
Why do you think the ADC retur ...

I have a 6 years of experience in PIC programing C CCS and I have had a problem with a particular device: PIC12F683. I connected a potentiometer in A/D input (AN3) and got the result to use in a PWM O ...

I compared the .LST file code to vs. 4.014 and it's the same. So then I
compiled your code with vs. 4.014 and tested it in hardware. It works.
I added the changes shown in bold below, to make it e ...

That's an old and very buggy version. I don't have it, so there is no way
for me to look at the .LST file to see any problems.

CCS PCM C Compiler, Version 4.013, 28193 20-mai-1 ...

PCW 4.0.0.206
That's not the compiler verison. It's a 4-digit number given at the top
of the .LST file, which is in your project directory.

Examples of compiler versions:
http://www.ccsinfo.com ...