Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG1B/EFR32MG1B231F256GM32/GPCRC/INPUTDATABYTE#0x0
Input 8-bit Data Register
Input Data for 8-bit
https://github.com/cmsis-svd/cmsis-svd-data