掉电模式时晶体振荡器停止振荡，所有功能除了中断和硬件复位之外都停止工作；
The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next Interrupt or Hard- ware Reset.
掉电模式时晶体振荡器停 止振荡，所有功能除了中断和硬件复位之外都停止工作，寄存器的内容则一直保持；
The Powerdown mode saves the register contents but freezes the Oscillator, disabling all other chips until the next interrupt or hardware reset.
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