Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f0/STM32F0x1/CAN/CAN_RF0R#0x0
CAN_RF0R
FMP0
FULL0
FOVR0
RFOM0
https://github.com/modm-io/cmsis-svd-stm32