多功能智能信號發(fā)生器

電子機電論文編號:JD947   論文字數(shù):16699,頁數(shù):46

目  錄
 
 摘 要 I
Abstract II
第1章 緒論 1
1.1智能信號發(fā)生器的背景 1
1.1.1對信號發(fā)生器的認識 1
1.1.2 本次設(shè)計的信號發(fā)生器的簡介 1
1.2 智能信號發(fā)生器的單片機背景 2
1.3 信號發(fā)生器的數(shù)模轉(zhuǎn)換背景 2
1.3.1數(shù)模轉(zhuǎn)換器的功能 2
1.3 D／A轉(zhuǎn)換部分 4
1.3.1 D／A轉(zhuǎn)換器概述 4
1.3. 2主要技術(shù)指標 5
第2章 智能信號發(fā)生器的硬件設(shè)計 6
2.1 信號發(fā)生器的總體硬件結(jié)構(gòu)及原理 6
2.2 存儲器的結(jié)構(gòu) 7
2.3 并行I/O口 9
2.4時鐘電路 10
2.5 復位操作 10
2.6復位電路 11
2.7鍵盤輸入電路 12
2.7.1鍵盤輸入應(yīng)解決的問題 12
2.7.2鍵盤的編碼 15
2.8  D/A轉(zhuǎn)換電路 16
2.8.1 D／A轉(zhuǎn)換器的工作原理 16
2.8.2  AT89C51與8位DAC0832的接口 17
第3章 智能信號發(fā)生器的軟件設(shè)計 20
3.1 軟件總程序流程介紹 20
3.2系統(tǒng)軟件設(shè)計 21
3.2.1 主程序 21
3.2.2鍵盤輸入程序 21
3.3 頻率的控制 23
3.4 三角波程序原理 24
3.5 矩形波程序原理 24
3.6 正弦波程序 24
結(jié) 論 27
參考文獻 28
程序框圖 29
protel總體原理圖 30
源程序 31
致謝 41

摘 要
信號發(fā)生器是一種能產(chǎn)生模擬電壓波形的設(shè)備，這些波形能夠校驗電子電路的設(shè)計。信號發(fā)生器廣泛用于電子電路、自動控制系統(tǒng)和教學實驗等領(lǐng)域。
 本次設(shè)計所設(shè)計的智能信號發(fā)生器，是基于ATMEL生產(chǎn)的AT89C51內(nèi)核的信號發(fā)生器，它的特點之處如下：1.可產(chǎn)生正弦波、方波，鋸齒波及三角波。2.各種信號的頻率范圍為10HZ-24MHZ，本信號發(fā)生器既可實現(xiàn)產(chǎn)生低頻信號，也可實現(xiàn)產(chǎn)生高頻信號，產(chǎn)生的信號為特定頻率信號。3.硬件主要由單片機和數(shù)模轉(zhuǎn)換器DAC0832構(gòu)成，電路簡單，結(jié)構(gòu)緊湊 ，硬件成本較低。4.波形及其參數(shù)可由軟件設(shè)定，程序采用c51語言編譯，使編譯比較簡單。
 本論文首先對信號發(fā)生器進行了概述，然后介紹了單片機的硬件和軟件知識。 硬件包括單片機AT89C51、復位電路 、時鐘電路 、鍵盤電路、 DAC0832 、運放4558；軟件包括各波形的產(chǎn)生及對硬件的控制程序。
 
關(guān)鍵詞　信號發(fā)生器  AT89C51  DAC0832  單片機  原理圖 源程序
 
 
 
 
Abstract
 
 
 A signal generator is an instrument for generating analog voltage waveforms and these waveforms can be used to verify the design of electronic circuits，signal generation is widely used in the automatic control and instructional experiment.
 The paper proposes a design and implementation of a signal generator that use AT89C51 as its major module, which produced by ATMlE Company. There are some special features as follows. (1) The signal generator can generate sine waveforms , saw waveforms, rectangle waveforms and triangle waveforms. (2) It can generate both low and high frequency signals that from 10HZ to 24MHZ. (3) It’s hardware includes AT89C51 and D/A chip DAC0832.The circuit is simple and the hardware is low cost. (4) We use the software to adjust the data of the waveforms. We use the 51 languages to compile the program, so it becomes easy to compile it.
 This paper shows some instruction first. And then tell us some knowledge about the microprocessor and the software. The generator’ hardware includes microprocessor AT89C51, reset circuits, clock circuits, keyboard circuits and DA0832; 4558.The software includes the programs for generating waveforms and controlling hard wares.
 
Keywords：　 signal generator, AT89C51, D/Achip,DA0832，microcontroller, schematic, source program