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.
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。
The multimedia timer and multithread technique were used to solve the high speed data transmission in serial port system and data communication in multi-serial port system.
采用多媒体定时器以及多线程技术，实现高速下数据在串口系统中的传输以及多串口数据通讯问题。
The server can then be configured to close the port when another sequence is received, or based on a timer.
然后对服务器进行这种设置：如果接到另一个序列，或者基于定时器，就关闭该端口。
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