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F28027 C2000 Piccolo LaunchPad套件,CCS5.4版本,proj_lab20原版程序,用USB烧写到flash中,可以用CCS控制正常运行,但是USB线拔掉后,重新上电,程序没有自动运行,按复位开关也没有用。但这时将USB线插上,不用连接CCS,程序就运行了,这时候拔掉USB线也可以正常运行,谁能帮忙分析下是什么问题?