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TMS32028377S PLL起不来!!!!!!!!!!!!!!!!!!!!!!!!

使用外部Crystal 使用示波器测量 晶振起振,,DSP  VSSOSC引脚接到晶振的电容端,,,程序运行到一下代码就跳不出去了,

while(ClkCfgRegs.SYSPLLSTS.bit.LOCKS != 1)
{
//
// Uncomment to service the watchdog
//
// ServiceDog();
}

配置成使用内部晶振也一样运行到此处过不去。