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TMS570LS3137: About Test Register(DCAN TEST) Field-EXL(External Loop Back Mode)

Part Number: TMS570LS3137


In the "CAN 7 Periodic Software Read Back of Static Configuration Registers", the CAN register is checked.

At that time, I detected that "DCAN TEST - EXL" was unintentionally changing.

What are the conditions under which "EXL" changes?