【導(dǎo)讀】示燈電路、電控鎖控制電路以及8位數(shù)碼管顯示電路等。門禁系統(tǒng)主要組成：由。采用射頻卡完成刷卡進(jìn)門，按鈕出門功能。再次動(dòng)作將門鎖鎖閉，指示燈熄滅。當(dāng)按下出門按鈕時(shí)，繼電器動(dòng)作將門鎖打開，閉，非法卡不顯示卡號(hào)門鎖不開。本系統(tǒng)設(shè)計(jì)簡單、性能優(yōu)良，具有一定的實(shí)用

　　

【正文】 the puter. SCM is entirely in accordance with the requirements of embedded system design, so SCM is the most typical embedded systems. SCM is the early application of technical requirements in accordance with the design of embedded puter chip integration, hence the name single chip. Subsequently, the MCU embedded applications to meet the growing demands of its control functions and peripheral interface functions, in particular, highlight the control function, so has international name the single chip microcontroller (MCU, Microcontroller Unit). 2 MCU modern electronic systems consisting of electronic systems will bee mainstream MCU is a devicelevel puter systems, it can be embedded into any object system to achieve intelligent control. Small to micromachinery, such as watches, hearing aids. Lowcost integrated devicelevel, lowto a few dollars, ten dollars, enough to spread to many civilian SCM appliances, electronic toys to go. SCM 27 constitutes a modern electronic systems has indepth to the households, are changing our lives, such as home audio, televisions, washing machines, microwave ovens, telephones, security systems, and air conditioners. SCM innovation the original electronic systems, such as microwave ovens use SCM, it can easily set the clock, the program memory, power control。 air conditioner after use of SCM is not only convenient for remote parameter setting, running automatically transform, frequency control can be achieved. At present, many household appliances such as VCD, DVD only single chip to achieve its function may occur before. 3 Embedded Systems led the entire electronics industry Current electronic ponents industry, in addition to microprocessors, embedded system devices, the most modern electronic systems around the supporting ponents industries, such as keys used to meet the humanputer interaction, LED / LCD display drivers, LED / LCD display units, voice integrated device, etc., to meet the requirements of data acquisition channel digital sensor, ADC, data acquisition module, signal conditioning modules to meet the servo drive control in the DAC, solid state relays, stepper motor controller, frequency control unit, etc., to meet the munication requirements various bus driver, level converters. Electronic ponents in the embedded systems world, driven by embedded applications along fully meet requirements of modern electronic systems development. This makes the original classic world of increasingly small electronic systems. Practitioners in the various electronic systems to modern electronic systems as early as possible to stay. SCM will create a new generation of electronic elite If the 5039。s, radio has created several generations of the world elite, then today39。s SCM will create a new generation of eworld elite. 1 A single chip with you to the intelligent electronics If we as a dead classic electronic system electronic system, then the intelligent modern electronic systems is a life of the electronic system. Application System of hardware, electronic systems, body, microcontroller applications, the application gives it life. For example, in the design of intelligent machines monitor display, it can boot the system selftest results show, not to enter the work shows a variety of standby state, equipment runtime display running processes, work can be displayed 28 after the end of the current results, self results, raw data, reports and other various processing. Unattended, it can run automatically given a variety of functions. Intelligent electronic systems for the endless realm, often without additional hardware resources can achieve all kinds of renovated function. It is also present in many household appliances feature a large number of additional factors. 2 single chip puter with you to the industrial area The 21st century is the century of humanity into the puter age, many people are not used in the manufacture of puter is the puter. People using the puter, only the people engaged in embedded system applications really into the internal puter system hardware and software systems, can we truly understand the nature of the puter39。s intelligence and grasp the knowledge of intelligent design. MCU applications starting from the learning technology applications in today39。s puter software training, hardware and technical personnel of one of the best roads. 3 SCM bring you into the most attractive in the digital world Charming single chip to enable you to experience the true meaning of the puter, you can design intelligent microcontroller handson toys, different applications can be designed to achieve different functions. Both software design and hardware making there, both mental and physical, but also hands. Primary level can develop intelligent toys, with macro programming. Intermediate levels can develop some intelligent controller, such as puter mouse, smart cars, all kinds of remote control model. High levels can be developed robots, such as robot soccer, the development of industrial control units, work munications, and highlevel language with assembly language or design application. Microcontroller and embedded systems around the formation of the future of the electronics industry, will provide a vast world of electronic fans, an even broader than the current wireless world, richer, more durable, more attractive in the digital world. Plunge into the microcontroller in the world to, will benefit your life. About mon single chip STC microcontroller STC39。s mainly based on the 8051 microcontroller core is a new generation of enhanced MCU, the instruction code is fully patible with the traditional 8051, 8 to 12 times faster, with ADC, 4 Road, PWM, dual serial ports, a global unique ID, encryption of good, strong antiinterference. PIC Microcontroller: