SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The MCAN module can be set into Internal Loop Back Mode by programming MCAN_TEST[4] LBCK and MCAN_CCCR[5] MON bits to 1. The Internal Loop Back Mode is used for a 'Hot Selftest'. The 'Hot Selftest' allows the MCAN module to be tested without affecting a running CAN system connected to the MCAN_TX and MCAN_RX pins. In this mode MCAN_RX pin is disconnected from the MCAN module and MCAN_TX pin is held recessive. Figure 26-193 shows the connection of the MCAN_TX and MCAN_RX pins to the MCAN module in case of Internal Loop Back Mode.
Figure 26-193 Internal Loop Back Mode