One reason I've seen for F87X's not working right away
is the Low Voltage Programming (LVP) enable bit in the
configuration word.  It defaults to enabled, which
takes away RB3 as an I/O pin.  I only looked at enough
of your code to see that LVP wasn't disabled.  You
don't say exactly what the problem is, but if RB3 is
mysteriously not reacting properly, this would explain
it.  Set configuration word bit 7 = 0.

--- anbarsystem@ZAZ.COM.BR wrote:
> Hi All,
> My first project with the PIC16F87X doesn't work. I
> am simply trying to do a
> conversion A/D in the PORTA0 and show it  in PORTB
> with leds.Also a led
> blinking in the PORTC6 using TMRO overflow. I'm
> using a 4MHZ cristal.
>
> See my Codes below.
>
> #DEFINE LED     PORTC6
>
>         list p=16f873
>
>         include "p16f873.inc"
>
>
>          __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF &
> _PWRTE_OFF & _XT_OSC &
> _WRT_ENABLE_OFF
>
<snip>
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