In the introduction to the first edition of this book, I explained my fascination with the Intel 8048 microcontroller. I first discovered this device when I was looking at the first IBM Personal Computer’s schematics. While the PC’s schematic its

总 体 概 述 本设计采用AT89S52单片机作为整个系统的控制核心，具有:音乐琴, 电子钟, LED阵列扫描显示, 液晶字符显示, 循环彩灯 五个模块。音乐琴采用4X4矩阵键盘为输入键盘,共有十六个基本音, 并与其他功能组合, 具有一定的实用性与趣味性, 较好的完成题目要求。 关键词：单片机 矩阵键盘 频率 。 -A general overview of the design using AT89S52 microcontroller as the core of the con