The Powerdown mode saves the register contents but freezes the Oscillator, disabling all other chips until the next interrupt or hardware 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.
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；
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