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Originally Posted by WizardOfAz
Hmmm. I'm not going to dive into the details of this I guess, since I'm going to continue down the "pot path" for measuring the angle. But I suspect this calculation is more than a bit optimistic. (1) can you really handle the shaft encoder interrupt in about 10 instructions? (2) are all instructions one cycle with no wait states needed? (3) what about the state save/restore cost of the interrupt? I'll bet it's more like 1% than 0.1%, still not too much load if you don't have a lot of them.
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It's 40 or 50 instructions total. There are no wait states involved.
-Kevin