在不破壞電力預(yù)算的前提下提高績效

　　反映低功耗單片機(jī)制造商是全球的趨勢，不斷增加的壓力驅(qū)動下的MCU的功耗下；當(dāng)前的“底線”是100μ/兆赫

　　但是為什么對OEM來說這變得如此重要，更重要的是，這在實(shí)踐中是如何實(shí)現(xiàn)的呢？IDMs做提供超低功率運(yùn)行是什么？一個(gè)具有低功耗特性的器件選擇僅僅是故事的一部分；同樣重要的是如何實(shí)現(xiàn)單片機(jī)的CPU架構(gòu)提供超低功率運(yùn)行。

　　本文將在這一趨勢看，檢查儀器最近從德克薩斯解（msp430fr5720）、飛思卡爾（mkl15z128vlk4-nd，mkl25z128vlh4-nd）、NXP（lpc1100l），能源微（壁虎）、Atmel（UC3 L系列）和Silicon Labs（sim3lxx），看看現(xiàn)有的解決方案可能能夠通過良好的設(shè)計(jì)技術(shù)實(shí)現(xiàn)超低功耗運(yùn)行。

　　從OEM到8位到32位微控制器的遷移路徑已經(jīng)形成，到目前為止，在一個(gè)主要的中長期視圖中，假定應(yīng)用程序變得越來越復(fù)雜，因此，在某些時(shí)候，需要采用更強(qiáng)大的架構(gòu)。

　　This argument is commonly simplified to ‘a(chǎn) rising level of complexity at the software level’， much of which is warranted; many of the efficiency gains made over recent years have been possible mainly through more sophisticated algorithms used in industrial control applications. In addition， greater levels of connectivity are now demanded by OEMs， which typically demands complex protocols. Few would argue that more powerful microcontrollers （MCUs） are able to integrate this complexity and connectivity with ease， providing significant benefits without the need for additional discrete devices.

　　Modern 32-bit architectures， once the domain of microprocessors， now enable a range of highly powerful and capable MCUs， characterized by the deployment of ARM?’s Cortex?-M family of cores in MCUs that can now cost as little as $0.50/each in production volumes. However， since their inception， 32-bit MCUs have faced stark resistance from the industry at large; resistance has systematically been eroded through developments and improvements in the 32-bit offerings. There are many things 32-bit devices can do better than their 8-bit counterparts.