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MSP430F5528的4MHz晶振不起振，同时V1.8V和VUSB无输出

user6346941
Prodigy 70 points
Other Parts Discussed in Thread: MSP430F5528

您好，我最近根据官方ez_FET做了个仿真器，发现MSP430F5528的4MHz晶振不起振，同时V1.8V和VUSB无输出，测量VBUS有5V输入。

请问这是什么原因，我应该从哪方面入手定位问题，谢谢