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芯片没有外接32k的引脚，发现不使能睡眠没有问题，一旦使能睡眠，连接明显变困难了。我推测是时钟精度问题，请问sdk怎么实现免32768的？校准内部低速rc来代替么？精度多少？怎么解决睡醒容易连不上问题，没有外部32k的情况下，rtc时钟精度多少？