Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG12P/EFR32FG12P431F1024GM48/TRNG0/TESTDATA#0x0
Test Data Register
Test data input to conditioning function or to the continuous tests
https://github.com/cmsis-svd/cmsis-svd-data