多功能出租车计价器设计 第1节 引 言
本次课程设计利用单片机技术来实现一台多功能出租车计价器，具有性能可靠、电路简单、成本低等特点。
1.1 出租车计价器概述
计价器显示的营运金额是营运里程与价格的函数（等候时间一般折算成一定比例的里程来计算）。出租车计价器通过传感器与行驶车辆连接。出租汽车的实际里程通过传感器的脉冲信号在计价器里折算成一定的计价营运里程。目前市场上出租车计价器功能主要有具有数据的复位功能、白天/晚上转换功能、数据输出功能、计时计价功能等等，但能够进行语音播报数据信息的出租车计价器还是比较少见的，针对这一点我们来设计一款多功能出租车计价器，在原有功能的基础上增加单价输出、单价调整、路程输出、显示当前的系统时间、语音播报数据信息等功能。 目 录
引 言·································································· 1
1. 1 出租车计价器概述········································································· 1
1. 2 本设计任务··················································································· 1
1.2.1 设计任务················································································· 1
1.2.2 设计要求················································································· 1
1. 3 系统主要功能··············································································· 2
出租车计价器硬件设计················································· 3
2.1 系统的硬件构成及功能···································································· 3
2. 2 AT89S51单片机及其引脚说明·························································· 3
2.3 AT24C02引脚图及其引脚功能··························································· 6
2. 4 AT24C02 掉电存储单元的设计························································· 6
2.5 里程计算、计价单元的设计····························································· 7
2.6 数据显示单元设计·········································································· 8
系统软件设计···························································10
3. 1 系统主程序设计············································································ 10
3. 2 定时中断程序设计········································································ 10
3. 3 里程计数中断服务程序设计···························································· 10
3.4 中途等待中断服务程序设计···························································· 10
3. 5 键盘服务程序设计·········································································10
3. 6 显示子程序服务程序设计······························································· 10
系统调试与测试结果分析·············································· 13
4. 1 使用的仪器仪表··········································································· 13
4.2 系统调试····················································································· 13
4.3 测试结果····················································································· 13
4.4 测试结果分析·············································································· 13
结束语································································· 14
附录··········································································· 15
参考文献······································································· 40
参考文献
[1]张鑫、华臻、陈书谦．《单片机原理及应用》[M]．电子工业出版社，2005．P110~136．
[2]丁元杰、吴大伟．《单片微机实题集与实验指导书》[M]．机械工业出版社， 2004．P124~125． 
