秒表/时钟计时器设计

目 录
第一章 课题背景、现状及发展........................................4
第二章 总体方案设计及方案比较......................................5
2.1总体方案设计..................................................5
2.2 方案比较......................................................5
2.3 方案论证......................................................6
第三章 系统硬件电路的设计...........................................7
3.1单元电路的设计.................................................7
3.1.1电源电路.....................................................7
3.1.2下载口电路...................................................8
3.1.3 复位电路.....................................................8
3.1.4 振荡电路.....................................................8
3.1.5 显示电路.....................................................9
3.1.6键盘电路.....................................................9
3.2 PCB的设计....................................................10
3.3 PCB的制作...................................................12
3.4 元件清单.....................................................12
第四章 系统程序设计...............................................12
4.1 主程序........................................................12
4.2 显示子程序...................................................14
4.3 定时器T0中断服务程序.........................................16
4.4 T1中断服务程序..............................................19
4.5 调时功能程序.................................................20
4.6 秒表/时钟功能总程序..........................................22
4.7功能实现情况及按键功能的应用...................................22
第五章 调试及功能实现...............................................23
5.1使用的主要仪器与工具...........................................32
5．2硬件调试的方法步骤............................................33
5．3软件调试部分..................................................33
第六章 总结........................................................35
第七章 参考文献....................................................35
附一..............................................................36
附二..............................................................37
附三..............................................................37
附四..............................................................40