SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
Software can directly override control of the CANnTX signal in four different ways, as follows:
The last two functions, combined with the readable CAN receive pin CANnRX, can be used to check the physical layer of the CAN bus.
The Transmit Control function is enabled by programming the TX[1:0] field in the CANTST register. The three test functions for the CANnTX signal interfere with all CAN protocol functions. TX[1:0] must be cleared when CAN message transfer or Loopback Mode, Silent Mode, or Basic Mode are selected.