In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi There;

Symmetrical drive means the transistors in the port can "push" (source current) equally well as they can "pull" (sink current).

As far as data memory is concerned; not directly, but certainly via software, either parallel (uses lots of I/O pins) or serial uses many fewer I/O pins).

Cheers,

Peter (pjv)

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