Embedded Tutorials on Instagram: "UART Interview Questions Part 15: What is loopback mode in UART? Loopback mode in UART is a special diagnostic feature used to test and verify the functionality of UART communication without requiring external connections. In this mode, the transmitter (TX) output is internally connected to the receiver (RX) input within the UART module itself. This allows any data transmitted by the UART to be immediately received back by the same UART, making it very useful fo