摘要
本文介绍了关于AT89C51单片机的并行口的一种扩展方法,并详细给出了软硬件的设计,在此基础上实现了跑马灯显示,LED数码管显示和D/A转换输出等功能。使此设计具有较强的实用性。
This paper mainly illuminates a design of lpt extending on AT89C51. and gives the design of software and hardware in detail. based the conclusions on the design, the system realizes horse race lamp and LED numeral pipe's display. the system still have D/A converting function. Then make the whole system have strong practicability.
关键词
单片机
并行口扩展
数码管
D/A转换
Singlechip
machine
Lpt extending
Numeral pipe
D/A converting
