Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F20x/UART5/CR3#0x0
Control register 3
Error interrupt enable
IrDA mode enable
IrDA low-power
Half-duplex selection
One sample bit method enable
https://github.com/cmsis-svd/cmsis-svd-data