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!!

Also, if someone has a better timer interrupt reference than the 16F84 data
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).

Thanks!

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