畢業(yè)設(shè)計(jì) 基于AT89S52單片機(jī)信號(hào)發(fā)生器的設(shè)計(jì)

基于AT89S52單片機(jī)信號(hào)發(fā)生器的設(shè)計(jì)

摘要

采用直接頻率信號(hào)合成器(DDS)與單片機(jī)(MCU)相結(jié)合的方法,介紹ADI 公司出品的AD9850 芯片,給出芯片的引腳圖和功能。并以單片機(jī)AT89S52為控制核心設(shè)計(jì)了一個(gè)串行控制方式的正弦信號(hào)發(fā)生器的可行性方案,給出了單片機(jī)AT89S52與AD9850連接電路圖和調(diào)試通過(guò)的源程序以供參考。該電路設(shè)計(jì)方案正確可行,頻率容易控制,操作簡(jiǎn)單靈活,且具有廣闊的應(yīng)用前景。詳細(xì)介紹了DDS基本原理、系統(tǒng)方案構(gòu)成、硬件電路設(shè)計(jì)和軟件設(shè)計(jì)。通過(guò)嚴(yán)格的實(shí)測(cè)數(shù)據(jù)分析表明該設(shè)計(jì)是可運(yùn)行的。

關(guān)鍵詞: AT89S52  AD9850  直接頻率合成技術(shù) 信號(hào)發(fā)生器

Abstract

The way is used which combines the Direct Digital Synthesizer(DDS) and Main Computati0nal Unit(MCU) to design afunction signalgenerator.AD9850 which is produced by ADI Company is int roduced ,then the pins diagram and function are given. And the  control of a serial control sinusoidal signal generator by the core of single chip AT89S52 is designed ,at the same time ,the circuit connect diagram between AD9850 and AT89S52 ,and feasibility of the program for reference are proposed. This circuit design project is correct and feasible, it is easy to control the frequency, simple and flexible to work, it also has broad application  prospect’s . The principle and system components of DDS is introduced. It also introduces the methods which design the hardware circuit and software .It shows a success design by the data which come from the strict experiments.
Keywords  : AT89S52 ,AD9850 ,DDS ,signal generator
          

目錄
摘要 I
Abstract II
目錄 III
前言 1
1 DDS概述 3
1.1 DDS結(jié)構(gòu) 3
1.1.1 頻率預(yù)置與調(diào)節(jié)電路 4
1.1.2累加器 4
1.1.3 控制相位的加法器 5
1.1.4 控制波形的加法器 5
1.1.5 波形存儲(chǔ)器 5
1.1.6 D/A轉(zhuǎn)換器 6
1.1.7 低通濾波器 6
1.2 DDS數(shù)學(xué)原理 6
2  總體設(shè)計(jì)方案 9
2．1系統(tǒng)設(shè)計(jì)原理 9
2．2總體設(shè)計(jì)框圖 9
3 系統(tǒng)硬件模塊的組成 10
3.1 鍵盤控制模塊 10
3.2單片機(jī)控制模塊 10
3.2.1 AT89S52主要性能 10
3.2.1.1 AT89S52功能特性描述 11
3.2.1.2 AT89S52的存儲(chǔ)器結(jié)構(gòu) 14
3.2.1.3 定時(shí)器 14
3.2.1.4中斷 16
3.2.3 時(shí)鐘電路 17
3.2.4復(fù)位電路 18
3.3 LCD顯示模塊 18
3.3.1 LCD1602的主要性能 18
3.3.2 LCD1602與單機(jī)的連接 20
3.4 AD9850 與單片機(jī)連接模塊 20
3.4.1 AD9850簡(jiǎn)介 20
3．4.3單片機(jī)與AD9850的連接 25
3.5.濾波電路設(shè)計(jì) 26
4 軟件設(shè)計(jì)與調(diào)試 28
4．1 程序流程圖 28
5 硬件電路制作 32
5.1 電路實(shí)現(xiàn)的基本步驟 32
5.2 原理圖的繪制 32
結(jié)論 34
謝  辭 35
參考文獻(xiàn) 36
附  錄 37