SWCU193 April 2023 CC2340R2 , CC2340R5 , CC2340R5-Q1
The connections required to use the UART port are the following two pins: UART0 TX and UART0 RX. The device communicating with the bootloader drives the UART0 RX pin on the CC23xx, while the CC23xx drives the UART0 TX pin.
While the baud rate is flexible, the UART serial format is fixed at 8 data bits, no parity, and 1 stop bit. The bootloader automatically detects the baud rate for communication.