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msp430f2618外部8M晶振无法正常起振???

Other Parts Discussed in Thread: MSP430F2618

msp430f2618单片机外接8M晶振,程序运行时钟初始化,始终跳不出下面代码

do
{
IFG1 &= ~OFIFG;            // Clear OSCFault flag
for (i = 0xFF; i > 0; i--);    // Time for flag to set
}
while (IFG1 & OFIFG);   // OSCFault flag still set?

寄存器IFG1的值不为零,用官方给的例程也是这样的问题。

用示波器看晶振两侧的图像如下:

上面这张波形有些失真。请各位大神和老师帮忙解答一下??多谢了