Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EFM32G/EFM32G890F128/MSC/WRITECMD#0x0
Write Command Register
Load MSC_ADDRB into ADDR
Erase Page
End Write Mode
Word Write-Once Trigger
Word Write Sequence Trigger
https://github.com/cmsis-svd/cmsis-svd-data