单片机控制的微型频率计设计

单片机控制的微型频率计设计

文档编号:TX078 文档字数:13949,页数:30

摘要

传统的测频仪器体积很大，耗能量大，主要靠手工操作，而最大的缺点是不可编程，其量程转换、数据测量、采样控制和处理等均不能通过程序指令来进行控制，无法作为一个微型智能子系统与某一大型自动控制或测试系统进行接口。针对这些缺点，本频率计在设计上作了根本的革新，其优点是：所用核心器件是先进的单片专用测频器件——单片频率计，集成度高，体积小，耗电省，功能强，实现了频率计的高度集成化和微型化；单片频率计只要加上晶振、量程选择、频率显示等很少量的器件即可构成一个DC（直流）至10MHz的微型基本测频电路；而最大的优点则是本频率计完全实现了单片频率计、频率采样与单片微机三者之间的硬件与软件接口，使得测频量程的选择、频率数据的测量、采样以及编码的边境转换和数据的转储均可能过单片微机的软件编程自动进行，从而实现了测频与采样工作的完全智能化，使得本系统既可独立构成一个微型智能测率仪器的核心电路，也可作为大型自动控制或测试系统中的一个智能子系统。

关键词高度集成化，单片机，频率计，电路

ABSTRACT

The traditional frequency measurement instrument volume is very big, consumes energy the quantity to be big, mainly depends on the manual operation, but the biggest shortcoming is unprogrammable, its measuring range transforms, the data survey, the sampling control and processing and so on cannot carry on the control through the program directive, is unable an achievement miniature intelligence subsystem carries on the connection with some large-scale automatic control or the test system. In view of these shortcomings, this frequency meter has made the radical innovation in the design, its merit is: Uses the core component is the advanced monolithic special-purpose frequency measurement component - - monolithic frequency meter, the integration rate is high, the volume is small, consumes the electricity province, function, has realized the frequency meter high integration and the microminiaturization; So long as the monolithic frequency meter adds on the crystal oscillator, the measuring range choice, the frequency demonstrated and so on the very few components then constitute DC (cocurrent) to the 10MHz miniature basic frequency measurement electric circuit; But the biggest merit was this frequency meter has realized monolithic frequency meter, frequency sampling electric circuit and the monolithic microcomputer three between hardware and the software connection completely, caused the frequency measurement measuring range the choice, the frequency data survey, the sampling as well as the code frontier transformation and the data dump possible monolithic microcomputer software programming automatically to carry on, thus has realized the frequency measurement and the sampling work intellectualizes completely, causes this system already to be possible to constitute a miniature intelligence to measure rate the instrument core electric circuit independently, also might take in the large-scale automatic control or a test system intelligent subsystem.

Keywords Integrates highly, monolithic integrated circuit, frequency meter, electric circuit

摘要 I
ABSTRACT II

1 绪论   1
2 系统逻辑框图的介绍 2
3 频率计硬件电路的设计   3
3.1 系统电源的设计 3
3.2 单片频率计电路 4
3.3量程选择和显示电路   7
3.2 单片频率计电路   4
3.4 频率计显示电路 9
3.5 频率计自动采样电路   10
3.6 单片机控制电路与保护电路 11
3.6.1 掉电保护 11
3.6.2 看门狗电路 12
4 频率计频率计信号源   13
4.1 扫频信号产生电路 13
4.2 当前频段自动产生电路   14
4.3扫频电压自动转换电路   16
4.4 终止频段码预置电路   17
5 系统软件设计   17
5.1 软件设计思路   17
5.5.1 信号源工作时的主程序说明 17
5.5.2 测频中断子程序说明 19
5.5.3 地址分配   20
5.2 程序清单 21
6 经济性分析 25
参考文献 25
致谢 26

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