【正文】 他個人或集體已經(jīng)發(fā)表或撰寫過的作品成果。對本文的研究做出重要貢獻的個人和集體均已在文中以明確方式標(biāo)明。 本科畢業(yè)論文（設(shè)計）作者簽名： 　 　 二 〇 一 一 年 五 月 二 十 六 日I目 錄摘 要 ........................................................................................................................................................................1ABSTRACT............................................................................................................................................................1正 文 ......................................................................................................................................................................21 緒 論 ....................................................................................................................................................................2 信號發(fā)生器現(xiàn)狀 ...........................................................................................................................................2 單片機在低頻信號發(fā)生器中的應(yīng)用 ...........................................................................................................22 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 ................................................................................................................................................4 芯片選擇模塊 ...............................................................................................................................................43 硬件電路的設(shè)計 ..................................................................................................................................................5 系統(tǒng)框圖 .......................................................................................................................................................5 資源分配 .....................................................................................................................................................5 最小單片機系統(tǒng)設(shè)計 ...................................................................................................................................6 各部分電路原理 .........................................................................................................................................10 DAC0832 芯片原理 ..........................................................................................................................10 LM324 工作原理 ...............................................................................................................................13 電路原理 .....................................................................................................................................................144 軟件設(shè)計 ............................................................................................................................................................14 主程序流程圖 .............................................................................................................................................15 方波程序流程圖 .........................................................................................................................................16 鋸齒波程序流程圖 .....................................................................................................................................17 正弦波程序流程圖 .....................................................................................................................................175 仿真結(jié)果 ............................................................................................................................................................186 測試結(jié)論 ............................................................................................................................................................207 結(jié)束語 ................................................................................................................................................................22參 考 文 獻 ..........................................................................................................................................................23附 錄 ......................................................................................................................................................................24致 謝 ......................................................................................................................................................................32文獻綜述 ................................................................................................................................................................33河西學(xué)院本科生畢業(yè)論文（設(shè)計）題目審批表 ................................................................................................36河西學(xué)院本科生畢業(yè)論文（設(shè)計）任務(wù)書 ........................................................................................................37河西學(xué)院本科畢業(yè)論文（設(shè)計）開題報告 ........................................................................................................39II河西學(xué)院物電系指導(dǎo)教師指導(dǎo)畢業(yè)論文情況登記表 ........................................................................................41河西學(xué)院畢業(yè)論文（設(shè)計）指導(dǎo)教師評審表 ....................................................................................................42河西學(xué)院本科生畢業(yè)論文（設(shè)計）答辯記錄表 ................................................................................................431基于 AT89S51 低頻信號發(fā)生器的設(shè)計與實現(xiàn)摘 要本信號發(fā)生器的設(shè)計采用 AT89S51 單片機作為控制核心，外圍采用數(shù)字 /模擬轉(zhuǎn)換電路（DAC0832） 、運放電路（LM324） 、按鍵和 LED 顯示燈電路。由于采用了 LM324 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。本設(shè)計能夠產(chǎn)生方波、鋸齒波、正弦波，并且所產(chǎn)生