目录
摘要....................................................................................................................................................2
Abstract ..............................................................................................................................................3
1.实习任务与要求.............................................................................................................................4
1.1 实习目的..............................................................................................................................4
1.2 实习任务..............................................................................................................................4
1.3 实习要求..............................................................................................................................5
2.基本原理......................................................................................................................................6
2.1 数字时钟基本原理..............................................................................................................6
2.2 温度计工作基本原理..........................................................................................................6
2.3 频率计工作基本原理..........................................................................................................6
3.方案论证......................................................................................................................................7
3.1 键盘显示接口部分..............................................................................................................7
3.2 温度计部分..........................................................................................................................7
4.硬件设计......................................................................................................................................9
4.1 最小系统设计......................................................................................................................9
4.1.1 晶振振荡器电路.......................................................................................................9
4.1.2 复位电路...................................................................................................................9
4.2 下载电路............................................................................................................................11
4.3 键盘电路............................................................................................................................12
4.4 显示电路............................................................................................................................13
4.4.1 数码管结构.............................................................................................................13
4.4.2LED 显示器工作原理.............................................................................................14
4.5 温度传感器电路设计........................................................................................................16
4.5.1DS18B20 的工作原理.............................................................................................16
4.5.2DS18B20 的测温原理.............................................................................................19
4.6 总电路................................................................................................................................21
5.软件设计....................................................................................................................................22
5.1 主程序流程图....................................................................................................................22
5.2 定时器 0 中断处理流程图................................................................................................23
5.3 时钟子程序........................................................................................................................24
5.4 温度子程序........................................................................................................................25
5.5 双机通信............................................................................................................................26
5.6 频率计子程序....................................................................................................................28
5.7 程序清单............................................................................................................................28
6.仿真分析....................................................................................................................................41
6.1 数字时钟仿真分析............................................................................................................41
6.2 温度计仿真........................................................................................................................43
6.3 频率计仿真........................................................................................................................45
7.实物运行照片...............................................................................................................................48
8 小结..............................................................................................................................................51
参考文献..........................................................................................................................................52
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