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28335总是进入limp mode



自己做的板子,仿真器可以和板子连接上,程序也可以下载进去,但是运行的时候程序总是运行到limp mode。

// Make sure the PLL is not running in limp mode
if (SysCtrlRegs.PLLSTS.bit.MCLKSTS != 0)
{
// Missing external clock has been detected
// Replace this line with a call to an appropriate
// SystemShutdown(); function.
asm(" ESTOP0");
}

也就是会进入这个函数,应该是哪里的问题?