Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F403Axx_v2/TMR2/CM2_INPUT#0x0
Channel input mode register 2
Channel 3 configure
Channel 3 input divider
Channel 3 digital filter
Channel 4 configure
Channel 4 input divider
Channel 4 digital filter
https://github.com/cmsis-svd/cmsis-svd-data