【正文】 .................................................................................................. 1 2 STC89C52 單片機(jī)的基本功能及應(yīng)用 ...................................................................... 2 STC89C52 芯片介紹 ........................................................................................... 2 STC89C52 應(yīng)用說(shuō)明 ........................................................................................... 3 單片機(jī)工作的最小化配置 ................................................................................. 4 3 系統(tǒng)設(shè)計(jì) .................................................................................................................... 5 設(shè)計(jì)要求 ............................................................................................................. 5 整體方案設(shè)計(jì) ..................................................................................................... 5 4 硬件設(shè)計(jì) .................................................................................................................... 9 時(shí)鐘電路 ............................................................................................................. 9 按鍵電路 ............................................................................................................. 9 復(fù)位電路 ........................................................................................................... 10 555 芯片電路 ..................................................................................................... 11 顯示電路 ........................................................................................................... 13 5 程序設(shè)計(jì) .................................................................................................................. 15 6 總結(jié) .......................................................................................................................... 16 參考文獻(xiàn) ...................................................................................................................... 17 附錄 .............................................................................................................................. 18 附錄 1 實(shí)物圖 ......................................................................................................... 18 附錄 2 元件清單 ..................................................................................................... 19 附錄 3 系統(tǒng)原理圖 ................................................................................................. 20 附錄 4 程序清單 ..................................................................................................... 21 致謝 .............................................................................................................................. 27 數(shù)字電容測(cè)量?jī)x 1 1 緒論 引言 當(dāng)前現(xiàn)代化電子市場(chǎng)正朝著方便快捷容量大的方向發(fā)展，現(xiàn)代電子產(chǎn)品幾乎能運(yùn)用到社會(huì)的各個(gè)領(lǐng)域當(dāng)中，有力的推動(dòng)了社會(huì)現(xiàn)代化的發(fā)。555 oscillator。STC89C52。 關(guān)鍵詞： 電容測(cè)量 。在軟件設(shè)計(jì)中，該設(shè)計(jì) 使用 C 語(yǔ)言來(lái)編寫程序。在多諧振蕩器輸出端加入一個(gè) 74HC08 使輸出波型毛刺減少，從而使單片機(jī)測(cè)量結(jié)果變精確。 本設(shè)計(jì)以 STC89C52 單片機(jī)和 555 振蕩器作為主要元件，來(lái)實(shí)現(xiàn)對(duì)電容容量的基本測(cè)量。數(shù)字電容測(cè)量?jī)x I 摘要 當(dāng)前現(xiàn)代化電子市場(chǎng)正朝著快速及便利同時(shí)大容量的方向發(fā)展，現(xiàn)代電子產(chǎn)品幾乎能運(yùn)用到社會(huì)的各個(gè)領(lǐng)域當(dāng)中，有力的推動(dòng)了社會(huì)現(xiàn)代化的發(fā)展。同時(shí)，電子產(chǎn)品也被要求以更快速度的升級(jí)和更快速的處理。本設(shè)計(jì)基于 555 振蕩器構(gòu)成多諧振蕩器來(lái)產(chǎn)生輸入脈沖信號(hào)，然后再通過(guò) STC89C52 單片機(jī)對(duì)方波脈沖進(jìn)行中斷計(jì)數(shù)而測(cè)量電容的。555 振蕩器所產(chǎn)生的信 號(hào)會(huì)根據(jù)所選的電阻的阻值不同，從而調(diào)節(jié)電容的參數(shù)值，這樣就可以確定被測(cè)電容的容值范圍，最后通過(guò) LCD1602 顯示器顯示被測(cè)電容容值。該儀器具有方便快捷，簡(jiǎn)單實(shí)用，價(jià)格低廉等特點(diǎn)。555 振蕩器 。LCD1602 數(shù)字電容測(cè)量?jī)x II Abstract The current modern electronic market is headed in fast and convenient large capacity and the direction of development, modern electronic products to use to almost all areas of society of powerful promoted the development of modern society. At the same time, the electronic products also are required to faster speed upgrade and more fast process. This design to STC89C52 singlechip microputer and 555 oscillator as the main ponents, to realize the basic capacity of capacitance measurement. This design based on the 555 oscillator to generate more than a harmonic oscillator input