Jean-Francois Joly wrote:
>
> Hello everyone!
>
> I have a little program here wich generates PWM but it doesn`t work. When I
> run it on my PIC16C84-04, all PORTB pins are low, that`s all... no pulse! Can
> someone take the time to check it out? (File attached to this message) I tried
> to find the problem, but coudn`t!
>
> Thank you!
> Jean-Francois
>
>     ---------------------------------------------------------------
>
>                 Part 1.2   Name: PWM.ASM
>                            Type: Plain Text (text/plain)
>
>     ---------------------------------------------------------------
>
> ---------------
> Jean-Francois & Alain Joly
> jolyal@capitalnet.com
Hi,
Problems is two:
1.then interrupt occurs GIE bit resets by hardware!
Set GIE bit & then do RETFIE :
CONT
        bsf     INTCON,GIE
        retfie
& PORTOFF subroutine end with:
        goto    CONT
2.T0IF not resets by harware ! You need reset it in
interrupt subroutine :
        ORG     0X004
        bcf     INTCON,T0IF
;       bsf     INTCON, T0IF    ;nounsence !!!!!
        ...........
with this modifications Your program works !
Best regards,
        Saras.