1.4 5-Bit Data Width May Cause UART Failure at 921600 bps or Higher Without Flow Control

When the 5-bit data width is selected, UART communication without flow control may not operate properly at baud rates of 921600 bps or higher. At these baud rates, the timing requirements for 5-bit framing without flow control exceed the device's capability, which may result in framing errors, data corruption, or a complete loss of UART communication.