如何高效的數(shù)據(jù)傳輸可以幫助MCU滿足系統(tǒng)要求

　　基于MCU的設(shè)計面臨越來越激烈的系統(tǒng)需求。無論是超低功耗，高性能，或兩者的困難混合，它可以是一個真正的斗爭，提供設(shè)計，滿足當(dāng)今咄咄逼人的目標(biāo)。在基于MCU的設(shè)計中最常見的操作之一是數(shù)據(jù)移動和數(shù)據(jù)傳輸功能的有效實施，這可能是至關(guān)重要的打擊低功耗或高加工目標(biāo)。在現(xiàn)代MCU，支持快速，高效的數(shù)據(jù)傳輸?shù)母鞣N功能的詳細(xì)了解是至關(guān)重要的，以創(chuàng)造最佳的MCU設(shè)計。

　　基本面

　　數(shù)據(jù)移動可以從一個功能塊到另一個功能塊，或片外使用標(biāo)準(zhǔn)接口。片上和外接芯片的傳輸通常包括標(biāo)準(zhǔn)外圍設(shè)備或存儲器接口。許多外設(shè)現(xiàn)在包括更高級別的功能，智能操作有點獨立于CPU。其中一個例子是將數(shù)據(jù)局部緩存到外圍設(shè)備，以便在方便的數(shù)據(jù)包中進(jìn)行傳輸，最大限度地減少CPU開銷。

　　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.