ADC and INTERRUPT PIC 16F877A

[sandrini]

I have a problem when I use the ADC and Timer0, Timer1 or Timer2 interrupt...
When I disable the interrupt, ADC return 1022 and when I enable the interrupt, the ADC return 973...
ADC return 614 when the interrupts is disable and return 47 when the interrupt is enable...
Somebody know what happening?

[PCM programmer]

It's possible that you are getting an interrupt in the middle of the
reading of a 16-bit value from the ADC, or during the transfer of
the result to a 16-bit variable. To test this idea, add the lines
shown in bold below: