“DMA”方式在LED屏显示系统中的应用

摘要

Considering of the speed requirements of LED panel system while processing data,MCU impulse signal produces SCK signal,so as to drive the LED panel,and display data can moved into unit of the board in the group shift registe directly without passing CPU,which based on DMA thought.This paper introduces STC12C5616AD MCU（RD） and SPI interface＇s ＂DMA＂ mode in the application LED panel,highlighting the advantage of ＂DMA＂ mode in the LED large screen display system.%针对LED显示屏系统在数据处理时对速度的要求,基于DMA思想,在处理数据时可以用单片机的脉冲信号产生SCK信号,从而驱动LED屏显示,显示数据可以不经过CPU直接以＂DMA＂方式移入单元板中的移位寄存器组中。本文介绍STC12C5616AD单片机的读（RD）和SPI接口的＂DMA＂方式在LED显示屏中的应用,突出＂DMA＂方式在LED大屏幕显示系统中的优势。