Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F101/CAN1/BTR#0x0
bit timing register
BRP
TS1
TS2
SJW
LBKM
SILM
https://github.com/modm-io/cmsis-svd-stm32