目录
1 引言...................................................................................................................................................................1
2 设计任务与要求概述.......................................................................................................................................1
2.1 题目.......................................................................................................................................................1
2.2 设计任务...............................................................................................................................................1
2.3 设计要求...............................................................................................................................................1
2.4 设计目的...............................................................................................................................................1
3 方案总体设计...................................................................................................................................................2
3.1 方案.......................................................................................................................................................2
3.1.1 控制芯片...................................................................................................................................2
3.1.2 显示方式...................................................................................................................................2
3.1.3 程序语言的选择.......................................................................................................................2
3.2 原理框图...............................................................................................................................................3
4 硬件电路设计...................................................................................................................................................3
4.1 抢答器的工作原理.............................................................................................................................3
4.2 单元电路设计.....................................................................................................................................3
4.2.1 抢答器电路 .................................................................................................................................3
4.2.2 发声电路设计...........................................................................................................................4
4.2.3 开始、复位按键输入电路的设计...........................................................................................4
4.2.4 时钟震荡电路...........................................................................................................................4
4.2.5 设定时间、加减时间电路设计...............................................................................................4
4.2.6 显示电路的设计.......................................................................................................................5
5 软件设计...........................................................................................................................................................6
5.1 抢答器工作流程...................................................................................................................................6
5.2 流程框图...............................................................................................................................................6
6 电路仿真调试...................................................................................................................................................7
6.1 上电准备状态.......................................................................................................................................7
6.2 开始抢答...............................................................................................................................................7
6.3 非法抢答...............................................................................................................................................8
6.4 正常抢答...............................................................................................................................................8
7 实验仪器及元器件清单...................................................................................................................................9
8 设计总结...........................................................................................................................................................9
9 致谢...................................................................................................................................................................9
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