Look in the manual on the figure covering the OPTION register=2E
Hans

> -----Ursprungligt meddelande-----
> Fr=E5n: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA=2EMIT=2EEDU]F=F6r James Fitzsimons
> Skickat: den 23 augusti 2001 12:53
> Till: PICLIST@MITVMA=2EMIT=2EEDU
> =C4mne: [PIC]:How do I set the prescaler for a PIC 16F84?
>
>
> Hello list,
> I just want to thank everybody who has taken the time to help me
> out so far
> in my PIC adventures ;-)
>
> I am writing a timer driver in Hi Tech C for the 16F84 and want to set a
> Timer0 interrupt period of 1 ms=2E
>
> So, so far I have enabled global interrupts (set GIE =3D1 ),  enabled the
> Timer0 interrupt (set T0IE =3D 1), cleared the PSA bit to assign
> prescaler to
> Timer0 module (PSA =3D 0), set TMR0 (TMR0 =3D 0x05) so TMR0 will count 250
> ticks=2E Now I fgure if I set a prescaler of 4 then the timer will interru=
pt
> evry 1000 cycles, which at a 4Mhz clock will be 1 ms=2E=2E=2E=2E is this
> correct so
> far?
>
> If I have managed to get this correct so far (my first timer playing with
> interrupts on any micro!) could some one please tell me how I set a
> prescaler value of 4? I know I have to set the PS0:PS2 bits, but
> have no how
> these bits create a prescaler value=2E I have read the datasheet pretty
> thourghly, but still don't understand=2E
>
> Thanks so much for any help you can provide,
> regards
> James Fitzsimons
>
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