矩阵键盘与液晶显示器外文文献翻译(含：英文原文及中文译文)文献出处：Carl Poy英文原文THE DESIGN OF MATRIX KEYBOARD AND LCD DISPLAYBASED ON MCUCarl PoyAbstractThe development of microelectronics technology and industrial measure requirement bring a good opportunity for development and research system, which makes it a broad prospects. The equipment has the advantages of small size, single power supply and a variety of output voltage leads it has a special module. Through the analysis of the hardware structure, we can summarizes each module needs.For example,we often go through the keys to realize the control of the electronic device. Small to watch mobile phone, to the TV computer, to a variety of complex instruments, all need to realize various operations through the buttons. This design is an important part of step for the further research, using buttons to control the display , include some modules like LCD 1602 liquid crystal display , 4*4 matrix keyboard , STC89C52single-chip microcomputer and other bine with the Proteus software, the simulation results are displayed on the LCD in 1602type of data.KEY WORDS: Single-chip; LCD 1602 liquid crystal display; 4*4 Matrix keyboard1 IntroductionWith the development of economy and the progress of science and technology, Microprocessors and peripheral chips have developed rapidly. The newest development of the integrated technology is the CPU chip and external. Like the program memory, data memory, parallel, serial, I/O timing / counter, interrupt controller and other control components are integrated in a chip—single chip. SCM 2 has a manufacturing process CMOS, The smaller lithography process improves integration which make the chip space smaller, lower cost, lower working voltage, lower power consumption. Adopts double CPU structure, increasing the width of data bus, improve the speed and the ability of data processing, a pipeline structure, improve the processing and computing speed, in order to meet the needs of real-time control and processing. To increase the storage capacity, the internal EPROM EPPROM, secure program, to improve the driving capability of parallel port, in order to reduce the peripheral driving chip, increase the logic function and control the external I/O port flexibility. Peripheral in serial mode based expansion; peripheral circuit internal installation is an obvious trend to connect the internet. Reliability and application level is getting higher and higher.Some high-end microcontroller and launched in recent years also contains many special function unit, Such as A/D converter, modem, communication controller, PLL, DMA, floating point unit etc.So,as we add some external expansion of the circuit and channel interface it can constitute a variety of computer applications, such as industrial control systems, data acquisition system, automatic test system, intelligent instrument, intelligent interface, function module etc. With MCU development and complete structure,SCM has become a powerful tool and will have a higher level and broader development.2 Design of the whole structure of systemThis design is based on single-chip, include matrix keyboard and LCD display module. Single-chip is the first model to select the appropriate target, function, reliability, cost, accuracy and speed control system. According to the actual situation of the topic selection, configuration management model different mainly from the following two aspects: First, supply chain management has strong anti-interference ability; second, SCM has a higher price. For information input module, keyboard selection can use economic benefits and meet the requirements of the 4*4 key matrix keyboard can realize multi function key requirements. As for the output module, using LCD 1602 liquid crystal display module, liquid crystal to achieve key information processing functions after the show. The circuit of the system is required byAT89C51 chip, clock circuit, reset circuit, driving circuit, scanning line driving circuit and LCD1602 LCD screen. 4*4 matrix keyboard access of P1.0 — P1.7,LCD 1602 screen to access P0.0— P0.7.3 System hardware circuit design3.1 Liquid crystal moduleThe principle of liquid crystal display is the use of physical properties of liquid crystal, The display control area voltage, power is displayed, it can display graphics. Liquid crystal display with thin thickness, suitable for large scale integrated circuit directly driven, easy to realize full color display characteristics, has been widely used in many fields of portable computer, digital camera, PDA mobile communication tools etc.1602 liquid crystal is also called the 1602 character LCD, which is a special used to display letters, numbers, symbols of the LCD module. It is composed of a plurality of 5X7 or 5X11 dot matrix character components, each dot matrix character who can display a character, there is a distance between the interval of each, there are intervals between each line, played the character spacing and row spacing, and because of this it is not well display graphics (with custom CGRAM, show the effect is not good). 1602 LCD refers to the display of the content for the 16X2, which can display two lines, 16 characters per line (LCD module display characters and numbers).3.2 Matrix keyboard moduleKey characteristicsThe keyboard is composed of a number of separate keys, press and release key is through the closed mechanical contact and off to achieve, because of the elastic action of mechanical contact, in the closing and the opening of the moment has a dither. Jitter must be eliminated, include software and hardware elimination.Scanning principleFirst determine whether a key is closed, and then one by one scan to further determine which button closure;(1) D0 ~ D3 output 0, level detection line D4 to D7. If the D4 - level D7 all high, said no key was pressed. If the D4 - level D7 is not all high, said the key was pressed.(2) If no key closure, return the scanning. If there is a button closure, in column by column scanning, closed key key number to find out. The D0=0, D1 ~ D3=1, D4 ~ D7 level, if D4=0, said the K1 key is pressed; similarly, if the D5 ~ D7=0, K5 respectively, K9, K13 key is down; if the D4 ~ D7=1, said that without a key is pressed. Then the D1=0, D0, D2, D3 was 1, the scanning of the second columns, which were carried on, until the closure of the key found.4 Software designThe software design mainly consists of keyboard scanningprocedures, write instruction code program of LCD module, LCD module display data initialization code written subroutine, liquid crystal display module, liquid crystal display a character subroutine, time delay subroutine and so on. Programming for each module, software programming ended, Keil software was used for debugging, when the various parts of the program debugging is correct, according to the source sequence of calls, the parts together, compile, compile successfully downloaded to the mcu. The result is when the user presses a key, LCD display of the button is pressed after the realization of functional parameters corresponding to the. When the system power supply, P1 port scan cycle and the key button debounce, after completion of input through the SCM processing, output in the P0 port, through the liquid crystal display program content, complete system function.5 ConclusionWith the continuous development of high and new technology, the miniaturization and the miniaturization of electronic products has been achieved. And all kinds of new technology, as a single field of the new method, the development trend of new products and symbol -- intelligent significantly is one of the trends in development. The module design display microcontroller matrix keyboard and LCD, make us understand to this technology innovation, through in-depth study on this technology, we can master the use in other areas, such as the design of electronicpassword lock, adjustment and control of indoor temperature and humidity, field access control system design etc.. Technological progress and economic development are the main themes of the present era, the improvement of people's living standard is bound to the requirements of electronic products increase, the design of any a small system is for a foundation, design of system innovation, the hardware, software integration, method and technology of virtual display and soft measurement artificial intelligence, I firmly believe that our life will be more colourful.中文译文基于单片机的矩阵键盘与液晶显示器的设计作者：Carl Poy摘要微电子技术和工业测量需求的发展为开发研究体系带来了良好的发展机遇，具有广阔的前景。
