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CC1310: RTC寄存器计时精度是否与外部晶振的精度有关

Part Number: CC1310

如题,我系统用的是外部晶振,外部晶振的精度是20ppm,那我RTC计数的精度误差是否也是20ppm?我看RTC寄存器的说明是32-kHz LF clock。这个时钟是内部还是外部?