Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/S6E1A1/GPIO/PFR2#0x0
Port Function Setting Register 2
Bit1 of PFR2
Bit2 of PFR2
Bit3 of PFR2
https://github.com/cmsis-svd/cmsis-svd-data