> One thing I like to do if I don't have the free ports that are edge
> changeable is using a small external PIC chip, you can get a 8 pin chip
> that can handle multiple  encoder and output the count on a single pin ,
> then check the count with your main chip whenever you have the free
> cycles. The extra chip doesn't have to have edge detectors since the
> rotary decoding is all it will be doing.
>=20
> The extra chip can keep the count for you  and the main chip can then
> check the status of a single pin, any pin you like using a one wire
> based communication to get the current count.

You could probably get that into a 6 pin PIC10F series chip ...



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