【摘要】
隨著時(shí)代的進(jìn)步，電子行業(yè)的發(fā)展，定時(shí)器的應(yīng)用也越來越廣泛。但傳統(tǒng)的定時(shí)器都是使用發(fā)條驅(qū)動(dòng)式、電機(jī)傳動(dòng)式或電鐘式等機(jī)械定時(shí)器。電子定時(shí)器相對(duì)產(chǎn)痛定時(shí)器來說，體積小、重量輕、造價(jià)低、精度高、壽命長(zhǎng)、而且安全可靠、調(diào)整方便、適于頻繁使用。本設(shè)計(jì)采用AT89C2051單片機(jī)為核心，闡述了系統(tǒng)工作原理，給出了軟件流程。該電子定時(shí)器滿足對(duì)電器的電源進(jìn)行控制，同時(shí)要方便用戶對(duì)電子定時(shí)器的操作。最大時(shí)間能達(dá)到30h，切最大精度可以到分鐘


關(guān)鍵詞：定時(shí)器；單片機(jī)；AT89C2051;動(dòng)態(tài)掃描；繼電器














【Abstract】
Progress , development of electron industry , the timer application are also more and more broad with the times. But, the tradition timer all is to use spring to drive machinery timers such as style , electric motor drive style or electric clock style. Come the electron timer to say volume is small , weight is light , cost of construction is low , accuracy is high , life-span is long, and safety is reliable , adjust to be suitable for being frequently put into use conveniently relatively painful timer of product. Have designed that the monolithic machine is core originally adopt AT89C2051 , have set forth system operating principle , have given a software out technological process. The power source go along being the electron timer's turn to be satisfied with electrical equipment is controlled , is wants the convenience of customers operation to electron timer at the same time. Maximal time can reach 30 hs , by all means maximal accuracy can arrive at a minute


Keywords: Timer; Monolithic machine; AT89C2051; Development is scanned; Relay









目 錄
1 引言 7
1.1課題的來源和意義 7
1.2電子定時(shí)器的應(yīng)用 8
1.3電子定時(shí)器的發(fā)展前景 8
2 51單片機(jī)內(nèi)部結(jié)構(gòu)及計(jì)數(shù)原理 8
2.1 51單片機(jī)內(nèi)部機(jī)構(gòu) 8
2.2計(jì)數(shù)原理 11
3 電子定時(shí)器的設(shè)計(jì) 19
3.1總體的設(shè)計(jì)要求 19
3.2 系統(tǒng)硬件電路設(shè)計(jì) 19
3.2.1 芯片的選擇 19
3.2.2 交流控制接口電路 19
3.2.3顯示電路 19
3.2.4 報(bào)警電路 19
3.3 系統(tǒng)程序的設(shè)計(jì) 20
3.3.1 主程序流程圖 20
4 重要元件及重要電路 21
4.1 AT89C2051的內(nèi)部結(jié)構(gòu)及功能和引腳說明 21
4.1.1 AT89C2051主要性能 22
4.1.2 AT89C2051的內(nèi)部結(jié)構(gòu) 22
4.1.3 AT89C2051的引腳說明 24
4.2 繼電器 26
4.2.1、電磁繼電器的工作原理和特性 26
4.2.2、繼電器主要產(chǎn)品技術(shù)參數(shù) 26
4.2.3、繼電器的電符號(hào)和觸點(diǎn)形式 27
4.3數(shù)碼管 28
4.3.1、數(shù)碼管的分類 28
4.3.2、數(shù)碼管的驅(qū)動(dòng)方式 28
5 軟件設(shè)計(jì) 29
5.1 偽定義 29
5.2 中斷入口 30
5.3 主程序 31
5.4倒計(jì)時(shí)程序 34
5.5 BCD子程序(加1或減1) 35
5.6加1程序 36
5.7調(diào)時(shí)快進(jìn)程序 37
5.8功能菜單程序 37
5.9到點(diǎn)工作程序 40
5.10響鈴程序 42
5.11顯示程序 43
5.12無顯示(滅燈)程序 45
5.13延時(shí)程序 45
5.14 ERR(出錯(cuò)處理)程序 47
結(jié)論 48
參考文獻(xiàn) 49
致謝 50
附錄 51