大专毕业论文——基于单片机的测速仪的设计.docVIP

【摘要】 单片机诞生于20世纪70年代末，经历了SCM、MCU、SoC三大阶段。 1.SCM即单片微型计算机（Single Chip Microcomputer）阶段，主要是寻求最佳的单片形态嵌入式系统的最佳体系结构。“创新模式”获得成功，奠定了SCM与通用计算机完全不同的发展道路。在开创嵌入式系统独立发展道路上，Intel公司功不可没。 2.MCU（即）微控制器（Micro Controller Unit）阶段，主要的技术发展方向是：不断扩展满足嵌入式应用时，对象系统要求的各种外围电路与接口电路，突显其对象的智能化控制能力。它所涉及的领域都与对象系统相关，因此，发展MCU的重任不可避免地落在电气、电子技术厂家。 3.单片机是嵌入式系统的独立发展之路，向MCU阶段发展的重要因素，就是寻求应用系统在芯片上的最大化解决；因此，专用单片机的发展自然形成了SoC化趋势。随着微电子技术、IC设计、EDA工具的发展，基于SoC的单片机应用系统设计会有较大的发展。 【关键词】：单片机,光敏三极管，数码显示，软件， ABSTRACT Single-chip was born in the 20th century, the end of the 70s, has experienced SCM, MCU, SoC three stages.  1.SCM that single-chip microcomputer (Single Chip Microcomputer) stage, is mainly on finding the best single-chip embedded systems form the best architecture. Innovation model to be successful, laid the SCM with the general-purpose computers, a completely different path of development. At creating embedded systems on an independent path of development, Intel Corporation credit.  2.MCU microcontroller (Micro Controller Unit) stage, the main direction of technology development are: expanding to meet the embedded applications, the target system requirements for the various peripheral circuits and interface circuits, to highlight the target of intelligent control. It covers areas associated with the object system, therefore, the development of MCUs responsibility inevitably falls on the electrical, electronics manufacturers. From this perspective, Intel gradually fade out MCU development also has its objective factors. 3. Singlechip are independent embedded systems development, to the MCU an important factor in the development stage, is seeking applications on the chip to maximize the resolution; Therefore, the development of dedicated single-chip SoC formed a natural trend. As microelectronic technology, IC design, EDA tools development, microcontroller-based SoC design application systems will have greater development. 【KEYWORD】Single-chip,phototransistor,a digital display Software. 目 录 一、引