【正文】 ring and amplification, the desired sine wave. PIC16F877 chip is produced by processing the sinusoidal signal sine table. Sine wave signal output to the DAC8413 threeway timethe first level cache access, and finally output the cache to the second stage D / A transformation to get the threephase sine wave output. Threephase sine last displayed on the LCD monitor to observe the relationship between the three phase sine. Threephase sine wave is the same three frequencies, amplitude equal to the sine wave 120 176。三相對稱正弦波是有三個頻率相同、幅度相等、相位差均為 120176。該正弦波發(fā)生器是通過PIC16F877芯片產生正弦波信號輸出到一塊多路二級緩存 DAC8413芯片，最后從 DAC8413輸出的信號經過濾波，放大，得到想要的正弦波。嵌入式控制器國內習慣稱為單片機。 PIC是一種采用精簡指令集計算機結構的易學易用、功能強大的單片機， PIC 性能價格比高，可廣泛用于高、中檔各類電子產品設計中。 PIC16F877 芯片是通過處理正弦表產生正弦信號的。的正弦波組成。 phase difference are formed. Threephase sine wave in sine wave is called a phase of each. Proven, this prototype produced a high stability, and a pact design and high cost. Key words: PIC16F877； DAC8413； Threephase sine wave 第 III 頁 共 Ⅳ 頁 目 錄 引言 ............................................................................................................................................ 1 1 系統(tǒng)設計 ..................................................................................................1 系統(tǒng) 設計要求 ..................................................................................................................... 1 總體設計 ............................................................................................................................. 1 2 方案論證 ........................................................................................................................... 2 微控制器的選擇 ................................................................................................................. 2 D/A 芯片的選擇 .................................................................................................................. 2 顯示電路選擇 ..................................................................................................................... 3 按鍵電路 ............................................................................................................................. 4 3 硬件電路設計 .................................................................................................................. 4 PIC 單片機最小系統(tǒng)電路計 ............................................................................................... 4 DAC8413 模塊電路 ............................................................................................................ 7 DAC8413 的概述 ................................................................................................................ 7 DAC8413 的內部結構 ........................................................................................................ 7 DAC8413 的外圍電路 ........................................................................................................ 9 DAC8413 輸出緩沖電路 .................................................................................................. 10 LCD 顯示電路 ................................................................................................................... 12 按鍵電路 ........................................................................................................................... 12 4 系統(tǒng)軟件設計 ................................................................................................................ 13 系統(tǒng)編程語言和編程工具 ............................................................................................... 13 系統(tǒng)各模塊程序設計 ....................................................................................................... 14 單片機與 D/A 產生波形程序模塊設計 ........................................................................ 14 LCD 顯示模塊程序設計 .................................................................................................. 16 系統(tǒng)軟件設計總結 ........................................................................................................... 18 5 系統(tǒng)調試 .......................................................................................................................... .18 系統(tǒng)裝備與檢查 ............................................................................................................... 18 硬件調試 ........................................................................................................................... 19 軟件調試 ........................................................................................................................... 19 綜合調試 ........................................................................................................................... 20 調試總結 .......................................................................................................................... 20 6 系統(tǒng)測試及數據分析 ................................................................................................. 20 測試儀器 .......................................................................................................................... 21 各項參數的測試 ............................................................................................................... 21 7 結論 ................................................................................................................................ 233 第 IV 頁 共 Ⅳ 頁 謝 辭 ...................................................................................................................................... 24 參考文獻： .............................................................................................................................. 25 附 錄 ...................................................................................................................................... 26