>Just double checking this.  At 4MHz, the timer will interrupt every:
>256((2^(prescaler+1)/(2^22)) seconds.  So with a 0 prescalar you'll be
>getting an interrupt every: 256(2/(2^22)) seconds (122us)?  This appears to
>be the smallest obtainable period with this clock speed.  If anyone can
>confirm this, it'd be much appreciated!!

No, actually at 4MHz, TMR0 will interrupt every 256us with a 1:1 prescaler.

>sheet, I'd appreciate that too.  The datasheet merely says 1:2 .. 1:256
>prescalars are available and I only assume that means clock/2^(prescale+1).

The datasheet says that the minimum prescale value for TMR0 is 1:2 when
assigned to TMR0.  To achieve a 1:1 scale for TMR0, assign the prescaler to
the WDT instead of TMR0.

--Andrew

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads