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。
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。
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