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求助!!430F5438,晶振不起振,循环跳不出!!求解~~



程序段:

原理图:

调试发现(没有置位):

小弟新手~刚接触430,用的是F5438~~
调串口的时候~用JTAG硬件仿真单步调试,程序一直在检测振荡器错误标志(用示波器发现晶振没有起振),只知道振荡器没打开,标志位没有置位,请各位大神指点一下,感谢~~