11.5.1 Use Case 1: Automatic Bit Rate Detection

It is possible to use the CAN in Listen-only test mode. For more information on how to enable Listen-only mode, see 11.6.4 Command Register and 11.2.5 CAN Test Modes. In Listen-only mode, the CAN controller receives all bus traffic but does not send any information to the bus. In this non-intrusive bus observation mode, the CAN controller can be used to determine the actual bit rate. During the bit rate detection, the CAN controller listens to the on-going CAN bus communication using a set of given bit rates and eventually detects the actual bit rate. The following flow chart outlines the procedure to detect the bit rate.