在这些寄存器的 #define宏前面，还应该定义另外一个宏，它用来说明 ISR 是在模拟模式中运行还是在原来的中断上下文中运行的。
On top of these register #define macros, you should also define another macro that dictates whether the ISR will run in simulation mode or in the original interrupt context. For example
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；
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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