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Not only can the DMA be programmed to get multiple bytes of data from the UART and load it into RAM, but when the specified number of data bytes is reached, the DMA can then interrupt the CPU to signal that N number of data bytes are now available for analysis. In this manner, the CPU can do other more important tasks and leave the peripheral handling to the DMA, thereby increasing the overall CPU throughput.
PTM Published on: 2011-11-03
Thailand