摘要：单片机频率计以其可靠性高、体积小、价格低、功能全等优点,广泛地应用于各种智能仪器中，这些智能仪器的操作在进行仪器校核以及测量过程的控制中，达到了自动化，传统仪器面板上的开关和旋钮被键盘所代替，有的还能自动调整测试点，这样不仅方便了操作，也提高了测试精度，因此频率计在教学、科研、测量仪器、工业控制等方面都有较广泛的应用。本设计以单片机为核心，利用单片机的计数器和定时器的功能对被测信号进行计数。编写相应的程序可以使单片机自动调节测量的量程，并把测出的频率数据送到显示电路显示。借助proteus软件，以方波作为输入信号检测电路的仿真效果。92529

毕业论文关键词：单片机，频率计，proteus

Abstract: With its high reliability, small size, low price, full functions ,single-chip frequency meter is widely used in various kinds of intelligent instruments。The operation of these intelligent instruments in the instrument calibration and measurement process control, have achieved automation, the traditional instrument panel switches and knobs are replaced by the keyboard, and some can automatically adjust the test poin。Not only is convenient for operation, but also improve the accuracy of the test, so the frequency meter has been widely applied in the fields of teaching, scientific research, measuring instruments, industrial control etc。。 The design takes the monolithic integrated circuit as the core, uses the monolithic integrated circuit counter and the timer function carries on the counting to the measured signal。 The preparation of the corresponding program allows the microcontroller to automatically adjust the measurement range, and the measured frequency data sent to the display circuit display。 With the help of Proteus Software, the simulation results of square wave are used as input signal detection circuit。

Keywords: single-chip ,frequency meter,proteus

目录

1 前言 3

2 概述 4

2。1 频率计的简介 4

2。2 频率计的发展与应用 5

3 系统总体方案设计 7

3。1 系统设计要求 7

3。2 频率计的工作原理 7

3。3 方案设计与论证 7

3。4 系统设计思路 8

3。5 系统设计框图 8

4 系统硬件设计 9

4。1 单片机模块 9

4。2 分频模块 15

4。3 显示电路 17

5 系统软件设计 18

5。1 频率测量模块 18

5。2 显示模块 19

5。3 延时模块 20

6 软件仿真 20

6。1 protues简介 20

6。2 频率计的仿真 23

结论 26

参考文献 27

致谢 28

附录A程序源代码 29

附录B元件清单 35

附录C整体系统原理图 36