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

The choice of using exteranl vs internal pullups is a question of speed, the internal pullups are weak (~20k?), this is ok for low speed applications but not high speed, for 40kHz the internal pullup should be fine depending on what you are hooking it up to, BTW connecting a resistor from the ground to the pin is a pulldown not pullup.

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