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.
系统硬件包括TMS320 LF 2407a，数据采集电路，复位电路、驱动电路及人机接口电路等。
The hardware of this system includes TMS320LF2407A, data acquisition circuit, reset circuit, driver circuit and man-machine interface circuit etc.
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