SWCU191 February 2022 CC1311P3 , CC1311R3 , CC2651P3 , CC2651R3 , CC2651R3SIPA
The UART can be placed into an internal loopback mode for diagnostic or debug work by setting the UART:CTL LBE register bit. In loopback mode, data transmitted on the UARTTXD output is received on the UARTRXD input. The LBE bit must be set before the UART is enabled.