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数字频率计嵌入式系统设计

论文编号:DZXX182  论文字数:10388,页数:26
摘要
 
 在电子技术中,频率是最基本的参数之一,又与许多电参量的测量方案、测量结果都有十分密切的关系,因此频率的测量就显得更为重要。电子计数器测量频率具有精度高、使用方便、测量迅速、便于实现以及测量过程自动化等优点,因而成为频率测量的重要手段之一。在本次毕业设计中选择使用单片机来制作数字频率计,并在实际制作中采用了直接测频法。利用延时产生的时基门控信号来控制闸门,通过在单位时间内计数器记录下的脉冲个数计算出输入信号的频率,最终送入LED中显示。这样制作出来的频率计不仅可以满足设计题目的参数要求,而且具有了单片机的稳定性和成熟性,且控制能力强,是一种低成本,高可靠的设计方案。
 
关键词: 单片机,频率计,测量
ABSTRACT
 With the unceasing development of electronic information industry, the measurement of the signal frequency is playing a significant role in theory study and practical application. In the project of electronic technology, frequency, which has great relation with the measurement methods and its measurement results, is one of the most basic parameters. Therefore, the measurement of frequency shows great importance. Among thousands of ways to measure frequency, electronic counter is taken as one of the best because of high precision, low time-cost, convenience, and automatic process. In this thesis, SCM was selected to make a digital frequency counter; meanwhile, direct measurement is taken in practice. Use the time-based gating signal created by time-delay to control the strobe. Compute the frequency with the help of the number of pulses recorded by the counter in specific time, then screen the result on the LCD. In this way, not only can my design reach the goal of my graduation thesis, but also it has stability and maturity.
Key Words: SCM,Frequency,Measure
 
目录
摘要 I
Abstract II
第1章 引言 1
1.1 背景 1
1.2 意义 1
 1.3 研究内容 2
第2章 频率计的方案设计 3
 2.1 方案的论证 3
 2.2 方案的选择 5
第3章  系统部件简介 6
 3.1 AT89S51单片机简介 6
 3.2 双电压比较器LM393简介 8
第4章 频率计的硬件设计 10
 4.1总体方案 10
 4.2 AT89S51单片机及其外围电路 10
 4.3 波形转换电路 10
 4.4 频率显示电路 11
第5章 单元程序设计 13
 5.1 1S定时 13
 5.2  T1计时程序 14
 5.3  频率数据采集 15
 5.4 进制转换 15
 5.5  数码显示 16
第6章 系统调试和实现 18
 6.1系统硬件调试 18
 6.2系统软件调试 18
 6.3整个系统调试 19
第7章  结束语 20
致  谢 21
参考文献 22
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