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TMS320F280039: TMS320F280039复位脚周期性低电平

Part Number: TMS320F280039

TMS320F280039未烧录程序,上电复位电平存在周期性低电平,将复位脚5脚外围电路去掉后故障依旧。周期性低电平频率67Hz,脉宽640us。请问是什么原因导致,急