9.6.4.5.3 Internal Only 32-bit Timestamp Generation
To select a 32-bit TSU internal timebase for timestamping, set MCAN_TSCC.TSS to 2 and MCAN_TSU_TSCFG.TCBS to 0.
Each TSU provides the timebase of the corresponding MCAN and must be enabled by setting MCAN_TSU_TSCFG.TSUE to 1.
The timestamp values are stored in the MCAN_TSU_TS registers available in the TSU.