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TMS320F280039C: 程序无法运行,晶振无法起振

Part Number: TMS320F280039C

我在使用了280039C芯片进行开发时发现,我使用仿真器进行程序仿真时,程序正常运行,但是当我断开仿真器再上电时,芯片不工作,晶振也无法起振,请问是什么原因?