Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/SiM3_NRND/SIM3C167_B/PBHD_4/PBDEN#0x0
Driver Enable
Port Bank N-Channel Driver Enable.
Port Bank P-Channel Driver Enable.
https://github.com/cmsis-svd/cmsis-svd-data