Tool/software:
If P-port can be configured an a floating INPUT?
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It is possible to do this, but not allowed; see [FAQ] How does a slow or floating input affect a CMOS device?
If an I/O pin is configured as input, you must apply an external logic signal, or add a pull-up/-down resistor.
Caishengjie,
Please let me know if you have any more questions. I agree with Clemens' answer here.
Regards,
Tyler