【正文】 I 圖書分類號： 密 級： 摘 要 眾所周知，數(shù)字技術(shù)和計算機技術(shù)己滲透到了工業(yè)、農(nóng)業(yè)、商業(yè)、教育、醫(yī)療、軍事、娛樂等每一個領(lǐng)域及生活中的每一個角落，其應(yīng)用之深之廣令人咋舌 ! 盡管 PC 機的應(yīng)用己相當(dāng)普遍，但是，在工業(yè)領(lǐng)域、在日益追求小而精、輕而薄的自動化控制器、自動化儀表、家電產(chǎn)品等方面， PC 機仍有所不適宜。在這種情況下，單片機以它優(yōu)越的控制功能、輕巧的體積，高可靠性和高性價比在智能化儀表系統(tǒng)、工控領(lǐng)域等日益顯示出強大的生命力，使傳統(tǒng)的電子技術(shù)產(chǎn)生了一場巨變，成為計算機發(fā)展史上一個新 的里程碑。 智能儀器的出現(xiàn)，極大地擴充了傳統(tǒng)儀器的應(yīng)用范圍。智能儀器憑借其體積小、功能強、功耗低等優(yōu)勢，迅速地在家用電器、科研單位和工業(yè)企業(yè)中得到了廣泛的應(yīng)用。 該函數(shù)發(fā)生器采用 AT89S51 單片機作為控制核心，外圍采用模擬 /數(shù)字轉(zhuǎn)換電路（ DAC0832）、運放電路（ OP07）、按鍵和 LED 顯示燈電路等。電路采用 AT89S51 單片機和兩片 DAC0832 數(shù)模轉(zhuǎn)換器組成數(shù)字式低頻信號發(fā)生器。函數(shù)信號發(fā)生器，它具有價格低、性能高和在低頻范圍內(nèi)穩(wěn)定性好、操作方便、體積小、耗電少等特點。由于采用了 OP07運算放大器，使其電路更加具有較高的穩(wěn)定性能，性能比高。此電路清晰，出現(xiàn)故障容易查找錯誤，操作簡單、方便。 通過按鍵控制可產(chǎn)生方波、鋸齒波、三角波、正弦波等，同時用 LED 顯示燈顯示對應(yīng)波形的的頻率和幅值。所產(chǎn)生的波形的頻率在 0Hz ~ 99Hz范圍可調(diào) ,幅值在 ~ 范圍可調(diào)，波形準(zhǔn)確并且平滑。本系統(tǒng)設(shè)計簡單、性能優(yōu)良，具有一定的實用性。 本設(shè)計主要應(yīng)用 AT89S51 作為控制核心。硬件電路簡單，軟件功能完善，控制系統(tǒng)可靠，性價比較高等特點，具有一定的使用和參考價值。 關(guān)鍵詞 AT89S51；低頻信號；發(fā)生器；運放器 II Abstract As we all know, digital technology and puter technology has perated into the industry, agriculture, merce, education, medical, military, entertainment, and every area of life in every corner of the application of wide deep staggering! Despite the application of PC has been quite mon, but in the industrial field, in pursuit of a small but growing, thin and light automatic controller, automation instruments, household electrical appliances and so on, PC still not suitable for machine. In this case, the singlechip control of its superior functionality, the size of pact, high reliability and costeffective instrument in the intelligent system, the growing industrial areas show great vitality to the traditional electronic technology resulted in a change to bee the puter history of the development of a new milestone. The emergence of intelligent machines, which greatly expanded the scope of application of traditional instruments. Intelligent instrument, with its small size, powerful, lowpower advantages of home appliances quickly, research institutes and industrial enterprises has been widely used. The function generator used as a control core single chip AT89S51, external analog / digital converter circuit (DAC0832), operational amplifier circuit (OP07), button and LED indicator lights and other circuits. AT89S51 circuit and two singlechip digital DAC0832 Digital to Analog ponents of lowfrequency signal generator. Function signal generator, it has a low price, highperformance and lowfrequency range of good stability, convenient operation, small size, low power consumption and so on. As a result of the OP07 operational amplifier to the circuit more stable high performance, high performance. This circuit clear, easy to find failure error, simple and convenient. Keys can be generated through control of square wave, sawtooth wave, triangle wave, sine wave and so on, at the same time with LED lights show the corresponding waveform frequency and amplitude. Waveform generated frequency range of 0Hz ~ 99Hz and generated amplitude range of ~, accurate and smooth waveform. The system is designed to be simple, excellent performance, with a certain degree of practicality. The main application of this design as a control core AT89S51. A simple hardware circuit, software functions, the control system reliable and costeffective features such as high, with a III certain degree of use and reference value. Keywords AT89S51 low frequency Signal Producer Player Win 徐州工程學(xué)院畢業(yè)設(shè)計 (論文 ) I 目 錄 1 緒論 ...........................................................................................................................................1 信號發(fā)生器現(xiàn)狀 ...............................................................................................................1 單片機在信號發(fā)生器中的應(yīng)用 .......................................................................................1 具有優(yōu)異的性能價格比 ............................................................................................1 控制功能強 .................................................................................................................1 集成度高、體積小、可靠性高 .................................................................................1 低電壓、低功耗 .........................................................................................................2 2 系統(tǒng)設(shè)計 ..................................................................................................................................3 系統(tǒng)方案的比較 ...............................................................................................................3 選 題論證 .....................................................................................................................3 方案選擇 .....................................................................................................................3 芯片選擇模塊 ....................................................................................................................3 系統(tǒng)設(shè)計要求 ....................................................................................................................4 3 硬件電路的設(shè)計 ......................................................................................................................5 系統(tǒng)原理 ............................................................................................................................5 資源分配 ...........................................................................................................................5 單片機的選擇 ....................................................................................................................5 AT89S51 功能特性概述 .............................................................................................5 AT89S51 的實物圖和引腳圖 .....................................................................................6 芯片主要特性 ........................................................................................