In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

Pins, especially input pins, should *never* be left floating. RTCC should be tied high if it is not being used. Unused I/O pins should either be pulled high using internal week pullups or set to outputs and forced low (for minimum power consumption).

I do not usually come across schematics posted by knowledgeable users where RTCC is left floating.

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