如何高效的数据传输可以帮助MCU满足系统要求

　　如何高效的数据传输可以帮助MCU满足系统要求

　　基于MCU的设计面临越来越激烈的系统需求。无论是超低功耗，高性能，或两者的困难混合，它可以是一个真正的斗争，提供设计，满足当今咄咄逼人的目标。在基于MCU的设计中最常见的操作之一是数据移动和数据传输功能的有效实施，这可能是至关重要的打击低功耗或高加工目标。在现代MCU，支持快速，高效的数据传输的各种功能的详细了解是至关重要的，以创造最佳的MCU设计。

　　基本面

　　数据移动可以从一个功能块到另一个功能块，或片外使用标准接口。片上和外接芯片的传输通常包括标准外围设备或存储器接口。许多外设现在包括更高级别的功能，智能操作有点独立于CPU。其中一个例子是将数据局部缓存到外围设备，以便在方便的数据包中进行传输，最大限度地减少CPU开销。

　　Data movement on-chip can be done efficiently using special data transfer resources. For example， data transfers between peripherals and memory can be done using intelligent Direct Memory Access （DMA） capabilities. The CPU need only be involved in setting up the transfer parameters （such as the memory location， transfer length， and active peripherals） and can be informed when the transfer is completed. The CPU can be doing other tasks while data is being transferred or can be put into a low-power mode to save power.

　　Many modern MCUs include advanced on-chip bus structures that help support multiple data transfers to occur simultaneously. When multiple data streams are moving simultaneously the very highest data transfer bandwidths can be achieved. Additionally， it is common in these cases for power consumption to be much less when compared to doing data transfers sequentially.