"基于AT89S52单片机的LED点阵显示屏设计"

Abstract This design presents a LED dot matrix display screen based on the AT89S52 microcontroller. The design utilizes the LED driver chip 4953 and a decoder to control a 128×32 LED dot matrix display screen. The AT29C series parallel FLASH memory is used for character data and control information storage. External parallel static RAM is also utilized to compensate for the limited RAM capacity of the AT89S52 microcontroller, enabling various scrolling display effects. The main microcontroller and the communication microcontroller work together to update display information and control parameters, as well as collect real-time time and temperature data. The LED display screen of the system can simultaneously display 16 Chinese characters in two rows of 16×16 dot matrix or 4 Chinese characters in a row of 32×32 dot matrix, and can also display the current time and temperature in real time. The display content and effects can be modified through PC software. The extended parallel FLASH memory allows the system to store up to 2000 characters even when the power is off. The independent nature of each LED display unit and the use of serial transmission for character data result in a greatly improved system scalability, making the cascading of multiple display units very convenient. The LED dot matrix display screen can be used not only in indoor environments but also in complex and harsh outdoor environments, demonstrating strong practicality. Keywords: LED dot matrix, microcontroller, parallel memory, dynamic scanning.