【正文】 ddatahd=0。 dlyplay()。 else sm1out=0。 datahg++。 if(chkkey==0) { chkkey=10。 smplay=tabsm[datamg]。 TMOD=0x21。j++)。i++) for(j=0。 uchar code tabsm[]={0x03,0x9F,0x25,0x0D,0x99,0x49,0x41,0x1F,0x01,0x09}。 獨立式按鍵就是各按鍵相互獨立，每個按鍵各接入一根輸入線，一根輸入線上的案件工作狀態(tài)不會影響其他輸入線上的工作狀態(tài)。 由于系統(tǒng)資源和系統(tǒng)復(fù)雜程度的增加，開始使用高級語言（如 C 語言）來開發(fā)單片機的程序。 單片機模塊中最常見的是電子時鐘，電子時鐘是一種用數(shù)字電路技術(shù)實現(xiàn)時、分、秒計時的裝置，與機械式時鐘相比具有更高的準確性和直觀性，且無機河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 2 械裝置，具有更更長的使用壽命，因此得到了廣泛的使用。 關(guān)鍵詞 ： 單片機； AT89S51 河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 II ABSTRACT Since the 1970 s chip since the advent, with its high cost performance and attention by people and attention, it is widely used and fast development. SCM small volume, light weight, strong antijamming capability, environmental demand is not high, low cost, high reliability, flexibility is good, development more easy. Because of the above features, in our country, the microcontroller is widely used in industrial automation control, automatic detection, intelligent instrument and apparatus, household appliances, power electronics, mechanical and electrical equipment, and other aspects, and 51 SCM is the most typical chip and most representative one. The graduation design through to its study, application to AT89S51 chips as the core, with the necessary circuit, design of a simple electronic clock, it by V dc power supply, through the electronic tube can show time, adjust the time, thus to learning, the design, the development of software and hardware in the ability. Electronic Clock is a electronic circuit implementation of the when, sub, seconds The figures show the timing device. Electronic clock precision, stability, far more than the old mechanical clock. In this design, we use LED electronic display hours, minutes, seconds, to 24hour time mode, according to electronic control theory to dynamic display to display, use the 12MHz crystal oscillation 河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 III pulse, the timer count. In this design, the circuit has a display time of the this function, you can also realize the time adjustment. Electronic clock is its pact, low cost, travel time and high precision, easy to use, features and more, easy integration and loved by the general consumer, so widely used. Key words: Singlechip microputer 。在這次設(shè)計中，我們采用LED 數(shù)碼管顯示時、分、秒，以 24 小時計時方式，根據(jù)數(shù)碼管動態(tài)顯示原理來進行顯示，用 12MHz 的晶振產(chǎn)生振蕩脈沖，定時器計數(shù)。單片機應(yīng)用的重要意義還在于，它從根本上改變了傳統(tǒng)的控制系統(tǒng)設(shè)計思想和設(shè)計方法。 有的單片機針對某一個應(yīng)用領(lǐng)域，集成了相關(guān)的河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 4 控制設(shè)備，以減少應(yīng)用系統(tǒng)的芯片數(shù)量。按鍵位于行列的1 2 3 4 5 6ABCD654321DCBAT itl eN u m b e r R e v i s io nS iz eBD a te : 4 M a r 2 0 0 8 S h e e t o f F ile : E :\產(chǎn)品 \5 1 實驗板工程 \小福星項目 \小福星電路原理圖 \實驗板單元電路 .d d bD ra w n B y :abfcgdedpdpc79af83g10com6b4 5com21de河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 8 交點上。 sbit subtime=P3^5。 void dlysys() { uchar i,j,k。i200。 flagplay=0。 else sm1out=0。 dlyplay()。 if((datahg!=2) amp。 } 河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 19 while(flagplay) { sm1out=sm2out=sm3out=sm4out=1。 河南工業(yè)職業(yè)技術(shù)學(xué)院畢業(yè)論文 20 smplay=tabds[ddatahg]。 if(addtime==0) { ddatahd++。 chgi=0。 ES=0。 sled2=~sled2。 (datahd==4)) { dat