【正文】 is value by 12. This gives an instruction frequency of 921583 instructions per second. Inverting this will provide the amount of time taken by each instruction cycle ( microseconds). 二、 The Introduction of AT89C51 1 Description The AT89C51 is a lowpower, highperformance CMOS 8bit microputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s highdensity nonvolatile memory technology and is patible The SCM and 181。s close on the heels of a special processor, while the ordinary price of the model dropped to one . dollars, the most highend models, only 10 . dollars. Contemporary singlechip microputer system is no longer only the baremetal environment in the development and use of a large number of dedicated embedded operating system is widely used in the full range of singlechip microputer. In PDAs and cell phones as the core processing of highend singlechip or even a dedicated direct access to Windows and Linux operating systems. More than a dedicated singlechip processor suitable for embedded systems, so it was up to the application. In fact the number of singlechip is the world39。s with the big consumer electronics product development, singlechip technology is a huge improvement. INTEL i960 Series with subsequent ARM in particular, a broad range of applications, quickly replaced by 32bit singlechip 16bit singlechip highend status, and enter the mainstream market. Traditional 8bit singlechip performance has been the rapid increase in processing power pared to the 8039。Vision2 一、 Principle of MCU Singlechip is an integrated on a single chip a plete puter system. Even though most of his features in a small chip, but it has a need to plete the majority of puter ponents: CPU, memory, internal and external bus system, most will have the Core. At the same time, such as integrated munication interfaces, timers, realtime clock and other peripheral equipment. And now the most powerful singlechip microputer system can even voice, image, working, input and output plex system integration on a single chip. Also known as singlechip MCU (Microcontroller), because it was first used in the field of industrial control. Only by the singlechip CPU chip developed from the dedicated processor. The design concept is the first by a large number of peripherals and CPU in a single chip, the puter system so that smaller, more easily integrated into the plex and demanding on the volume control devices. INTEL the Z80 is one of the first design in accordance with the idea of the processor, From then on, the MCU and the development of a dedicated processor parted ways. Early singlechip 8bit or all of the four. One of the most successful is INTEL39。 城 市 學(xué) 院 本 科 畢 業(yè) 設(shè) 計(jì) 論 文 題 目 The SCM and μ Vision2 所在系 電 氣 與 信息 工程 系 學(xué)生姓名 冉乾乾 專 業(yè) 電子信息工程 班 級(jí) 電信 002 學(xué)號(hào) 10010085 指導(dǎo)教師 金印彬 2020 年 5 月 The SCM and 181。Vision2 The SCM and 181。s 8031, because the performance of a simple and reliable access to a lot of good praise. Since then in 8031 to develop a singlechip microputer system MCS51 series. Based on singlechip microputer system of the system is still widely used until now. As the field of industrial control requirements increase in the beginning of a 16bit singlechip, but not ideal because the price has not been very widely used. After the 9039。s to raise a few hundred times. At present, the highend 32bit singlechip frequency over 300MHz, the performance of the mid9039。s largest puter. Modern human life used in almost every piece of electronic and mechanical products will have a singlechip integration. Phone, telephone, calculator, home appliances, electronic toys, handheld puters and puter accessories such as a mouse in the Department are 西安交通大學(xué)城市學(xué)院本科生 畢業(yè)設(shè)計(jì)（外文翻譯） equipped with 12 single chip. And personal puters also have a large number of singlechip microputer in the workplace. Vehicles equipped with more than 40 Department of the general singlechip, plex industrial control systems and even singlechip may have hundreds of work at the same time! SCM is not only far exceeds the number of PC and other integrated puting, even more than the number of human beings. Hardwave introduction The 8051 family of micro controllers is based on an architecture which is highly optimized for embedded control systems. It is used in a wide variety of applications from military equipment to automobiles to the keyboard on your PC. Second only to the Motorola 68HC11 in eight bit processors sales, the 8051 family of microcontrollers is available in a wide array of variations from manufacturers such as Intel, Philips, and Siemens. These manufacturers have added numerous features and peripherals to the 8051 such as I2C interfaces, analog to digital converters, watchdog timers, and pulse width modulated outputs. Variations of the 8051 with clock speeds up to 40MHz and voltage requirements down to volts are available. This wide range of parts based on one core makes the 8051 family an excellent choice as the base architecture for a pany39。Vision2 with the industrystandard MCS51 instruction set. The onchip Flash allows the program memory to be reprogrammed insystem or by a conventional nonvolatile memory programmer. By bining a versatile 8bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microputer which provides a highlyflexible and costeffective solution to many embedded control applications. 2 Function characteristic The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16bit timer/counters, one 5 vector twolevel interrupt architecture, a full