FERRAN BOHIGAS i DARANAS wrote:
>
> Hello,
>     I'm trying to use the timer1 (TMR1) with the PIC16C73A, but I've
> some problems,
> I program the interrruption, and it works (T1CON=b'00001101') when I use
> the internal clock, but when I program the external one
> (T1CON=b'00001111') it never triggers the interruptions,does any one
> know why?
>
>                                                                 Ferran
> Bohigas i Daranas

Insufficient data !

is pin 12 your clock signal input ?
is it configured as input ?
is your interupt software able to discern cause of interupt correctly ?
is your interupt software proven functional and does it clearly
indicate  activation ?

Do we know any of the above ?

Regards,
Graham Daniel