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.

So, so far I have enabled global interrupts (set GIE =1 ),  enabled the
Timer0 interrupt (set T0IE = 1), cleared the PSA bit to assign prescaler to
Timer0 module (PSA = 0), set TMR0 (TMR0 = 0x05) so TMR0 will count 250
ticks. Now I fgure if I set a prescaler of 4 then the timer will interrupt
evry 1000 cycles, which at a 4Mhz clock will be 1 ms.... 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. I have read the datasheet pretty
thourghly, but still don't understand.

Thanks so much for any help you can provide,
regards
James Fitzsimons

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