All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without uninten- tionally changing the direction of any other pin with the SBI and CBI instructions... Each output buffer has symmetrical drive characteristics with both high sink and source capability. The pin driver is strong enough to drive LED displays directly.
Currently I use the pinMode(gndPin, INPUT) command to try to sink the LED into.
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