目 录
1 设计总体方案........................................................................................1
1.1 设计要求与目的 ..................................................................................1
1.2 设计思路 ..............................................................................................1
1.3 工作原理 ...............................................................................................2
1.4 功能说明 ..............................................................................................2
2 主要元器件介绍...................................................................................3
2.1 AT89C51 单片机 ..................................................................................3
2.2 四位共阴数码管 ..................................................................................5
3 系统硬件设计........................................................................................6
3.1 电源电路 ..............................................................................................6
3.2 时钟电路 ..............................................................................................6
3.3 复位电路 ..............................................................................................7
3.4 显示电路 ..............................................................................................7
3.5 键盘电路 ..............................................................................................8
4 软件设计...................................................................................................9
5 系统调试及结果分析......................................................................11
6 总结 ...........................................................................................................12
