將單片機和DSP功能塊和基于數據流的處理

　　微控制器做好控制用戶界面的工作。他們可以初始化其他電路，監控輸入，反應中斷，并驅動輸出顯示和控制。然而，當模擬功能，如A/D轉換器、D/A轉換器、PWMs、參考電壓，運算放大器和比較器，讓單片機的功能在模擬領域，這對于許多相對簡單的模擬處理任務總體上是常見的，微控制器通常是弱時，模擬信號的處理。

　　恒溫器是一個很好的例子，幾乎任何混合信號微控制器可以處理。它監視一個溫度，將它與設定點進行比較，并拋出一個開關。您可以添加編程滯后，定時操作，云，和全世界的連接到它，但底線是，MCU拋出或釋放一個開關來執行其任務。

　　In the real world， however， most control loops operate much faster than a room’s temperature change， and monitor more than just one input. This is where basic attributes such as speed， performance， and flexible architecture are important， but also important is the type of DSP functionality either merged into the core of the microcontroller， or， sitting side by side with a microcontroller to tackle analog functionality， especially with block- or stream-oriented types of processing needs.

　　This article looks at levels of DSP functionality available in standard microcontrollers， as well as the features used to turn analog-signal processing into digital-domain solutions. All parts， datasheets， tutorials， and development kits referenced here can be found online at Digi-Key’s website.