Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA2A1AB/ACMPHS0/CMPSEL0#0x0
CMPSEL=others
Comparator Input Select Register
Comparator input selection
0 (000): No input
0 (others): Setting prohibited
1 (001): IVCMP0 selected
2 (010): IVCMP1 selected
4 (100): IVCMP2 selected
https://github.com/cmsis-svd/cmsis-svd-data