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TDA4VM: How to check the busoff status of can on the MAIN domain correctly?

Part Number: TDA4VM

Where can I see the busoff status of can on the MAIN domain?

I found a register in the TRM describing Bus_off Status.Can this register reflect the busoft status of can?

But the meaning  of  the  Bus_off Status register is not very clear.I don't understand the specific meaning of change and unchange? Can help explain?