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关于CC430时钟的问题,为什么需要外接32768Hz晶振



我查看了CC430单片机的一体化时钟系统,其片内包含32768Hz的REFOCLK,可通过配置作为ACLK,但是发现很多人在用的时候还会外接XT1(32768Hz),用来作为ACLK。我不明白为什么还需要XT1呢,直接用REFOCLK不就可以了吗?