> You can't divide an encoder signal, you need to build a FSM that takes
> care of direction changes. Try to use a PAL or FPGA or such device. It
> will work with very high speed encoders.
>
> Peter

You certainly _can_ divide an encoder signal. It just requires a fancier
state machine than a normal binary counter. :-)

One complicating factor is that the machine has to change state on both
edges of both inputs. This is rather trickier than just a 'current
state'->'next state' machine driven by a single clock (unless, of course you
drive it with a separate clock that runs faster than either input).

I suspect this could be done with a PIC12C508 at 4MHz clock and handle up to
about 100,000 Hz inputs.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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