Hi,
I see some limitations in relation to synchronization of that external
clock to the internal clock (page 6 of Microchip doc no 31011a.pdf)
But maybe as long as you have a duty cycle of approximately 50% you
might not have a problem.
On the other hand, please explain why your 13.56 (I guess it is MHz) is
so im****tant for you. What is the needed resolution of that clock? Any
other relevant information could be handy in order to help you.
Regards
Klaus
la_panza skrev:
> Hello all, I need to obtain a timer tick of 18.88 microseconds on a 20
> MHZ clocked PIC16F
>
> On the same board I also have a 13.56 clock, but for speed problems I
> neet to keep the processor clocked at 20 MHZ
>
> This 13.56 MHZ signal, divided by 256 is exactly the timer tick I want,
> so I thought to feed this signal as an external clock for Timer'0
> (T0ckl).
>
> On the datasheet though, I've read some warning and limitations about
> the use of Timer0 with external clock, I did not clearly understand if
> in a case like mine I'm allowed to do it...
>
> who can help please?
>
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