單片機控制的微型頻率計設計

論文編號:TX078       電子通信論文字數:13949,頁數:30

目   錄

摘  要  I
ABSTRACT  II

1  緒論   1
2  系統邏輯框圖的介紹  2
3  頻率計硬件電路的設計   3
3.1 系統電源的設計  3
3.2 單片頻率計電路  4
3.3量程選擇和顯示電路   7
3.2 單片頻率計電路   4 
3.4 頻率計顯示電路  9
3.5 頻率計自動采樣電路   10
3.6 單片機控制電路與保護電路  11
3.6.1 掉電保護  11
3.6.2 看門狗電路  12
4  頻率計頻率計信號源   13
4.1 掃頻信號產生電路  13
4.2 當前頻段自動產生電路   14
4.3掃頻電壓自動轉換電路   16
4.4 終止頻段碼預置電路   17
5  系統軟件設計   17
5.1 軟件設計思路   17
5.5.1 信號源工作時的主程序說明  17
5.5.2 測頻中斷子程序說明  19
5.5.3 地址分配   20
5.2 程序清單  21
6  經濟性分析  25
參 考 文 獻  25
致 謝  26

摘  要

傳統的測頻儀器體積很大，耗能量大，主要靠手工操作，而最大的缺點是不可編程，其量程轉換、數據測量、采樣控制和處理等均不能通過程序指令來進行控制，無法作為一個微型智能子系統與某一大型自動控制或測試系統進行接口。針對這些缺點，本頻率計在設計上作了根本的革新，其優點是：所用核心器件是先進的單片專用測頻器件——單片頻率計，集成度高，體積小，耗電省，功能強，實現了頻率計的高度集成化和微型化；單片頻率計只要加上晶振、量程選擇、頻率顯示等很少量的器件即可構成一個DC（直流）至10MHz的微型基本測頻電路；而最大的優點則是本頻率計完全實現了單片頻率計、頻率采樣與單片微機三者之間的硬件與軟件接口，使得測頻量程的選擇、頻率數據的測量、采樣以及編碼的邊境轉換和數據的轉儲均可能過單片微機的軟件編程自動進行，從而實現了測頻與采樣工作的完全智能化，使得本系統既可獨立構成一個微型智能測率儀器的核心電路，也可作為大型自動控制或測試系統中的一個智能子系統。
 

關鍵詞  高度集成化，單片機，頻率計，電路

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