I know I've seen this done;  Hmmm...  Don't see the binder it's in,
right now.  (Need to get that in the machine here!)

  I know you can change the effective R in an RC clocked PIC - That DC &
up clock speed is sure handy here <G>  R #2 from RC junction to port
pin, output a High for "Fast" mode, Tri-state the pin for slow mode
(costs you some power though.)  Should be a better way.  Aah.  Also
could use a digital potentiometer, THAT would be a smoother move.

  Also, could change the divisor on a frequency divisor IC, using an
external clock oscillator, use a PIC pin to change the divisor.

  But the way I saw it done was IIRC even sneakier <G>  Might have been
in a Microchip Seminar?

  Mark

Wagner Lipnharski wrote:
> <snipped>
> I am not talking about sleep or power off modes, I mean
> to keep the processor running doing something useful
> but able to "floor it" (speed up) when requested by
> some interrupt routine or something like that.
>
> Any experiences at all?
> --------------------------------------------------------
> Wagner Lipnharski - UST Research Inc. - Orlando, Florida
> Forum and microcontroller web site:   http:/www.ustr.net
> Microcontrollers Survey:  http://www.ustr.net/tellme.htm