CPU电源状态程度越深，采取的电能节省措施就越多 —比如说停止处理器时钟或停止外部中断请求。
The deeper the C state, the more power saving steps are taken—steps like stopping the processor clock or stopping interrupts from coming in.
介绍了由单片机控制的可控硅电路，该电路运用外部中断获得同步信号，用定时器做导通角控制，并给出实用程。
The controllable silicon circuit controlled by monolithic microcomputer is introduced, which adopts external interrupt to obtain sync signals and controls conducting angel with a timer.
DMA可以被外部(INT3 - 0)、内部的(片内定时器和串口)中断触发运行，传输完成后可以向CPU发出中断请求。
DMA can run constantly or can be triggered by exterior interruption (INT3-0), interior interruption (timer and serial port), at the end of transfers, send interruption signal to CPU.
在硬件设计主要介绍系统组成中的外部存储器模块与视频输入输出模块，介绍了使用片上支持库编写DM642中视频驱动程序的方法，以及编写过程中DM642中断和直接存储器存取（DMA）的应用；
The hardware chapter introduces the external memory module and video I/O module, programs video-driver for the DM642 by using CSL, discuss the applications of interrupt and direct memory access (DMA).
在硬件设计主要介绍系统组成中的外部存储器模块与视频输入输出模块，介绍了使用片上支持库编写DM642中视频驱动程序的方法，以及编写过程中DM642中断和直接存储器存取（DMA）的应用；
The hardware chapter introduces the external memory module and video I/O module, programs video-driver for the DM642 by using CSL, discuss the applications of interrupt and direct memory access (DMA).
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