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CC2640R2F: 低功耗串口uart使用

Part Number: CC2640R2F

cc2640r2f 4*4封装,是否有低功耗串口的demo,就是有数据接收或者发送的时候打开串口,进行正常的收发,没有数据需要收和发的时候,可以关闭串口并且不影响进入低功耗状态。是否有相关的demo,或者有什么方式可以来实现这种需求?