Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F101xx/UART5/SR#0x0
UART4_SR
PE
FE
NE
ORE
IDLE
RXNE
TC
TXE
LBD
https://github.com/cmsis-svd/cmsis-svd-data