黑龙江学院毕业论文基于单片机的倒计时时钟设计姓 名： * * * 指导老师： ** ** ** 专 业： 电子技术 班 级： 2025 年 10 月 15 日目 录摘 要................................................................................1关键词................................................................................1引 言................................................................................21. 系统基本设计思路...................................................................32. 单元电路方案论证...................................................................32.1 控制器模块......................................................................32.2 计时模块........................................................................32.3 显示模块........................................................................32.4 最终方案........................................................................43. 系统硬件介绍.......................................................................43.1 STC89C51 单片机..................................................................43.2 数码管显示模块..................................................................84. 系统软件设计......................................................................104.1 编程软件 KEIL C51...............................................................104.2 画图软件 PROTEL99SE..............................................................104.3 仿真软件 PROTEUS.................................................................114.4 程序流程图.....................................................................125. 调试与实现........................................................................13结 论...............................................................................14参考文献.............................................................................15致 谢...............................................................................16附录 1 原理图.....
