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TMS320F28374S: Trouble Reading Register ST1: (Error -1156 @ 0x6) Device may be operating in low-power mode

Part Number: TMS320F28374S

Tool/software:

When we burned the code in DSP28374s, the following fault was reported. The current test power supply voltage 3.3V&1.2V is ok, please help to see if there is anything else that can trigger the following problem.