SWCU191 February 2022 CC1311P3 , CC1311R3 , CC2651P3 , CC2651R3 , CC2651R3SIPA
The I2C modules can be placed into an internal-loopback mode for diagnostic or debug work by setting the I2C Master Configuration register (I2C:MCR) LPBK bit. In loopback mode, the SDA and SCL signals from the master and slave modules are tied together.