Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/MB9AF42xL/GPIO/PFR1#0x0
Port function setting register 1
Bit0 of PFR1
Bit1 of PFR1
Bit2 of PFR1
Bit4 of PFR1
Bit5 of PFR1
Bit7 of PFR1
Bit8 of PFR1
Bit9 of PFR1
https://github.com/cmsis-svd/cmsis-svd-data