摘要
本文主要介绍编码键盘接口芯片 74 92 2与单片机AT89C51及相关译码器构成多键盘、多位数显示接口电路 (以 4× 4键盘 ,8位数显示接口为例 )。本电路克服了以往并行接口设计中占用较多I/O口且键盘控制编程较繁的缺点 。
This article introduces 4×4 keyboard and 8 LED display interface circuit constituted by coding keyboard interface chip 74922,microprocessor AT89c51 and decoder. This circuit overcomes the shortcomings in many I/O interfaces and the complicated keyboard control program in abreast interface design used before. It has a degree of reference and practical value in grand scale microprocessor application system of multiple key and LED display.
出处
《浙江树人大学学报》
2004年第1期79-81,共3页
Journal of Zhejiang Shuren University
