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CC1310: 进入休眠会产生异常电流

Part Number: CC1310

通过Task_sleep进入休眠后,能达到5uA以内,设置的4秒休眠,但是每隔一段时间(不到2秒),会出现一个25uA左右的跳变电流,请问这个是怎么产生的,还有进入休眠之前通过UART_Close()关闭串口,串口助手会打印一个00,能否规避?