Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/ETH/ETH_MMC_CONTROL#0x0
MMC control register
Counters Reset
Counter Stop Rollover
Reset on Read
MMC Counter Freeze
Counters Preset
Full-Half Preset
Update MMC Counters for Dropped Broadcast Packets
https://github.com/modm-io/cmsis-svd-stm32