I would like to share what I think is a very slick programming technique that both the Arduino development team as well as Arduino users may well be interested in -- Achieving very high performance pin I/O. Fortunately, this issue is not new and searches in the Forum has turned up quite a few hit…

Super High Performance Pin I/O Technique

CrossRoads April 3, 2014, 5:06am 7

What does direct port manipulation yield?

PIND = 0b00000100; // toggle D2 by writing to the input register.

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