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采用内部晶振一旦ClkCfgRegs.SYSPLLCTL1.bit.PLLCLKEN = 1;烧写到片子里面程序就不执行。
单步调试又是可以执行的，真是无语了，请各位高手多多指教。
PLL使能 对频率有没有影响 单步是在RAM中运行
