Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B510F1024GQ100/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