ST STM32F301 6 Series Reference Manual page 779

RM0366 Universal synchronous/asynchronous receiver transmitter (USART/UART)
Table 107. USART register map and reset values (continued)
Register
Offset name
reset value
USART_TDR TDR[8:0]
0x28
Reset value X X X X X X X X X
Refer to Section 2.2 on page 40 for the register boundary addresses.
RM0366 Rev 5 779/874
779