Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F100/UART5/CR1#0x0
Control register 1
SBK
RWU
RE
TE
IDLEIE
RXNEIE
TCIE
TXEIE
PEIE
PS
PCE
WAKE
M
UE
https://github.com/modm-io/cmsis-svd-stm32