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MSP430F2618: MSP430F2618芯片不使用外部LFXT1，振荡器一直报故障

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Prodigy 30 points
Part Number: MSP430F2618

有个项目，只需要使用XT2高速时钟，外部电路只有XT2晶振，无LFXT1 晶振。时钟配置代码如下。

对LFXT1不进行操作，开启XT2,会报振荡器错误，程序卡在上图红框中。所以我想知道MSP430F2618是否必须要有LFXT1晶振才能工作。