Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F100/UART5/SR#0x0
Status register
PE
FE
NE
ORE
IDLE
RXNE
TC
TXE
LBD
https://github.com/modm-io/cmsis-svd-stm32