【正文】 ...........................................................................................................................................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 .............................................................................................................6 芯片管腳說明 .............................................................................................................6 的晶振及其連接方法 ..................................................................................8 AT89S51 的復位 .........................................................................................................9 芯片擦除 .....................................................................................................................9 變壓電路的設(shè)計 ...............................................................................................................9 L7805 芯片 ..................................................................................................................9 變壓電路 ..................................................................................................................10 信號調(diào)節(jié)電路的設(shè)計 ...................................................................................................... 11 DAC0832 芯片原理 .................................................................................................. 11 OP07 芯片原理 .........................................................................................................13 信號調(diào)節(jié)模塊 ..........................................................................................................14 顯示電路的設(shè)計 ..............................................................................................................14 74HC573 芯片原理 ...................................................................................................14 數(shù)碼管的分類 ...........................................................................................................15 徐州工程學院畢業(yè)設(shè)計 (論文 ) II 數(shù)碼管的驅(qū)動方式 ...................................................................................................16 4 軟件設(shè)計 ................................................................................................................................19 主程序設(shè)計 ......................................................................................................................19 四種波形程序設(shè)計 .........................................................................................................19 頻率和幅度的調(diào)節(jié) .........................................................................................................20 加減鍵和確定鍵的實現(xiàn) .................................................................................................22 5 測試結(jié)論 ................................................................................................................................25 測試結(jié)果 ..........................................................................................................................25 示波器測試的波形 ..........................................................................................................25 結(jié)論 ............................................................................................................................................28 致謝 ............................................................................................................................................29 參考文獻 ....................................................................................................................................30 附錄 ............................................................................................................................................31 附錄 1 硬件實物圖 ...............................................