Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F403Axx_v2/TMR6/CTRL1#0x0
Control register 1
TMR enable
Overflow event enable
Overflow event source
One cycle mode enable
Period buffer enable
https://github.com/cmsis-svd/cmsis-svd-data