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TI专家，您好。我所用芯片MSP430F6638，软件平台IAR5.20，操作系统windows xp sp2. 我的usb电路如附件。 给430上电并连上usb口后，系统无法识别。请问是什么原因
看不见你图。是找不到设备还是无法识别？如果是无法识别，请确认在VBuS有连220nF+电容
