Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f3/STM32F3x4/HRTIM_Common/EECR3#0x0
Timer External Event Control Register 3
EE6F
EE7F
EE8F
EE9F
EE10F
EEVSD
https://github.com/modm-io/cmsis-svd-stm32