（1）使能POWER_SAVING以后，协议栈会根据一系列判断自动进入PM2或或PM3模式。不要显式调用halsleep。你可以debug，代码跟踪看是什么原因，系统没有进入低功耗。
（2）进入低功耗后，看门狗只是不计数，你从低功耗唤醒后，看门狗由于晶振恢复，还是可以继续计数的。
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