自动化专业基于单片机的LED显示屏的设计与Proteus仿真外文文献翻译及原文Word文档格式.docx

1、文献、资料来源： 文献、资料发表（出版）日期：指导教师:翻译日期:2017. 02. 14院（部）专业：自动化班级：姓名：学号：英文原文LED Display Screen Design and Proteus Simulation Based on Single-Chip MicrocomputerAbstract This paper designs a LED display system controlled by AT89C52 MCU （Microcomputer Controller Unit）. The AT89C52 controls the external circuit

2、 formed by 74HC154 and used to control the real time display. Language C is applied to compile program in KeiluVision3 programming environment. The display system is simulated through Proteus software. In Proteus environment，the schematic diagram is drawn. Through stimulation，it achieves real-time d

3、isplay, static display and dynamic display of Chinese characters. It has switch keys to change display state of details. Through the actual simulation，the biggest controllable screen size of the AT89C52 MCU is 64x32. The AT89C52 controls the entire screen display of Chinese characters of 16x16 dot m

4、atrix, a total of eight characters. And the key function can be extended.Keywords-LED display; AT89C52; Proteus; dynamic scanningI. INTRODUCTIONEnergy-saving issue attracts everyone5 s attention. Thus the products that focus on energy conservation get more recognition. LED （Light Emitting Diode-LED）

5、 display produced in the 1970s when it was simply used to display number and text. With the diversification of Led colors and enhancement of brightness， full color outdoors LED display became a real ity at the end of the 20th century. The LED of our country appeared in the 1970s and its industrial p

6、roduction inthe 1980s. The development of information and advertising industry brings about the emergence of LED display screen. LED display screens are mainly used in advertising window, train stations, banks and other places. It gets more and more widely used. Its own character i st ics could make

7、 it occupy a market in the display screen industry in the future.In the design of LED display, the hardest part is hardware debug. In order toso I ve the s i gna I i nterference, i nsuff i c i ent so I der in hardware connection, component damage and a series of debugging problems, the EDA （Electron

8、ic Design Automation-EDA） utility software Proteus that the UK Labcenter e I ectron i cs company researched can be used to realize the entire hardware system schematic drawing and simulation1.Proteus simulation environment includes ISIS and ARES. In the ISIS environment， electronic circuit can be di

9、rectly stimulated in the stage of schematic. It also provides virtual machines, simulation of the input signal which makes a convenient simulation. ARES i s mainly used for PCB （Printed Circuit Board- PCB） design. The device library provides schematic device and its package. It can design printed ci

10、rcuit board inthis environment.Proteus simulation system current ly supports MCU （Micro Control Ier Unit-MCU） with ARM7, 8051/52 series, AVRseries, PIC 10/12/16/18 series, HC11 series and the MSP430 2. It can observe the d i rect result of hardware debug with proteus simulation. It has the character

11、s such as intuitive, convenient, cost savings, high efficiency and so on.II. THE DESIGN OF LED DI SPLAYLED display system is formed by MCU, LED screen display circuit, externa I circuit and the program for control the system. LED screen display circuit includes LED pane I and the driving circuit of

12、row and column. The externa I function circuit includes key controlling circuit and reaI-time clock ci rcuit. Display function can be achieved as fol Iows: numbers, characters, Chinese characters, static display of monochrome pi ctures, and dynamic display. Dynam ic display i nc I udes the whole dis

13、play content moving up and I eft. The shift method is control led by keys, and also by automatic cycle. The system of real-time clock display provides seconds, minutes, hours, day， date, month, and year information. The overall block d i agramof LED display screen is shown in Fig. 1.Fure 1. The over

14、all block diagram of LED display screenIII.HARDWARE DESIGN OFLED DI SPLAYA. Design of Row DrivingCircuitThe core of LEDdisplay system is the controlcircuit. Thecontrol circuitincludes driving circuit, clock circuit and the smallest MCU system wh i ch cons i sts of AT89C52 MCU, Crystal osci I I ator

15、c i rcu it and reset ci rcu it Row dr i v i ng ch i p is 74HG154, 4-to-16 I ine decoder/ demultiplexer, active LOW outputs.P2. 0P2. 3 port of AT89C52 connect to A0A3 of 74HC154 decoder. According to the operating principle of the decoder, when the MCU system controls its P2 port output 0x000x0F，the 74HC154 respecti veIyL如Al沁A3IVDLlglIYllggIYtIY5IY5IYylgiggIYDIYBIY14JI丽Y0YlY2Y3Y4Y5Y6Y7l710711Y14IBPJXIPJJPJ3output LOW I eve I from YO to Y15. And then the first I i ne to the sixteenth line of display screen is selected. The P2. 4 port of MCU connec