Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series0/EZR32HG/EZR32HG320F64R69/MTB/FLOW#0x0
MTB Trace Flow Register
AUTOSTOP enable.
AUTOHALT enable.
WATERMARK value.
https://github.com/cmsis-svd/cmsis-svd-data