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PM1/PM2模式下睡眠定时器可以运行，PM3的话所有时钟信号全关闭了，详情如下：
Power mode 1. Digital regulator on; 16-MHz RCOSC and 32- MHz crystal oscillator off; 32.768-kHz XOSC, POR, BOD and sleep timer active; RAM and register retention
Power mode 2. Digital regulator off; 16-MHz RCOSC and 32-MHz crystal oscillator off; 32.768-kHz XOSC, POR, and sleep timer active; RAM and register retention
Power mode 3. Digital regulator off; no clocks; POR active; RAM and register retention
