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

If you're using the internal pull-up then your [normally-open] button should be connected between the I/O pin and ground (Vss).  Make sure that your button pin is an input -- if it's made an output and high while the button is pressed you'll have a short between the pin and ground.  For this reason we often recommend putting a 220-ohm resistor between the pin and the button.

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