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TMS320F28035上电后一直复位???

Other Parts Discussed in Thread: TMS320F28027

现在出现了一个奇怪的问题,tms320f28027的复位脚通过电阻上拉接到3.3V,但是发现连接不上仿真器。用示波器观察发现复位引脚一直在复位,74hz,低电平持续大约60us。求解啊