Alfredo del Rio wrote:
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When I think about the smart "reverse connected ports method" I find that it would be easy for the 8051 developers to add an ALU instruction for this purpose. Maybe they didn't think that the 8051 would be used some day for FFT applications (or similar) where bit reversing (mirror) is needed.

Considering the fact that the 8051 core was designed in the late 1970's, I don't think the developers at Intel had FFT applications in mind ...

Rob.