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

You were probably setting the pins back to input mode rather than setting them to low output.  That way you have two inputs tied together and the state of that is dependent on stray electrical fields around the pins.  If there's significant capacitance where you have them connected, it's quite possible that the voltage would stay high until "bled off".

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