The MOS marked in the figure below will close at a jump edge, right？
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For a detailed explanation of how the highlighted transistor works, please see this video series:
another question. As for the description of pull-up resistance in the datasheet, I would like to ask how the pull-up resistance value switch is realized internally. Is the switch realized after the high and low level is stabilized?
The same circuitry that controls the one-shot circuits also controls the resistor values. Note that when a state change is detected, the one-shots will fire, essentially shorting the I/O pins either high or low for a short time.
So, when transitioning from low to high, the resistors will change to 4kohm and the positive one-shots will fire, shorting the I/O pins to VCCx. When transitioning from high to low, the resistors will change to 40kohm and the negative one-shots will fire, shorting the I/O pins to GND.