SPRUJ79A November 2024 – December 2025 F29H850TU , F29H859TU-Q1
The UART can be placed into an internal loopback mode for diagnostic or debug work by setting the LBE bit in the UARTCTL register. In loopback mode, data transmitted on the UnTx output is received on the UnRx input. Note that the LBE bit must be set before the UART is enabled.