【正文】 加限流電阻b、使用電壓：段：根據(jù)發(fā)光顏色決定；小數(shù)點：根據(jù)發(fā)光顏色決定c、使用電流：靜態(tài)：總電流80mA（每段10mA）；動態(tài)：平均電流45mA峰值電流100mA。圖24 單片機(jī)復(fù)位電路 數(shù)碼顯示模塊設(shè)計顯示器普遍地用于直觀地顯示數(shù)字系統(tǒng)的運行狀態(tài)和工作數(shù)據(jù)，按照材料及產(chǎn)品工藝，單片機(jī)應(yīng)用系統(tǒng)中常用的顯示器有：發(fā)光二極管LED顯示器、液晶LCD顯示器、CRT顯示器等。P1口：P1口是一個內(nèi)部提供上拉電阻的8位雙向I/O口，它不再需要多路轉(zhuǎn)接電路MUX；因此它作為輸出口使用時，無需再外接上拉電阻，當(dāng)作為輸入口使用時，同樣也需先向其鎖存器寫“1”，使輸出驅(qū)動電路的FET截止。 設(shè)計要求1）．時制式為24小時制。關(guān)鍵字：單片機(jī)，數(shù)字時鐘。 分個位RST：復(fù)位信號。單片機(jī)常見的復(fù)位如圖24所示。LED顯示器的顯示控制方式按驅(qū)動方式可分成靜態(tài)顯示方式和動態(tài)顯示方式兩種。圖31 主程序流程圖 定時器流程圖定時器中斷時是先檢測1秒是否到，1秒如果到，秒單元就加1，如果沒到，就檢測1分鐘是否到，1分鐘如果到，分單元就加1，如果沒到，就檢測1小時是否到，1小時如果到，時單元就加1，如果沒到，就顯示時間。 } if(MD==0) { c=c1。 P0=disp[10]。 delayus(150)。 f=f+1。單片機(jī)作為我們主要的專業(yè)課程之一，我覺得單片機(jī)課程設(shè)計很有必要，而且很有意義。t agree with the disciplinary action your employer has taken against yous antiracism taskforce, is in London for the Football Association39。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。t start planning... Those years, those days of do, finally, like youth, will end in our life.　　此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。At the moment, the sky is dark, the air is fresh factor after just rained. Suddenly thought of blue plaid shirt?；蛟S是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個不同的日子過成了同一天的樣子；或許是追溯過去，對自己那些近乎偏執(zhí)的怪異信念的醒悟，這些天以來，思緒一直很凌亂，在腦海中不斷糾纏。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. 譚浩強(qiáng). C程序設(shè)計（第二版）[M]. 清華大學(xué)出版社,2003[4]并且市場上的實時時鐘日歷芯片品類繁多，IC化的傳感器各種各樣，顯示方式也愈趨于人性化。 d=d+1。 P0=disp[e]。 P2=0xfd。 while(us) { for(t=1。單片機(jī)的軟件設(shè)計通常要考慮以下幾個方面的問題：（1）根據(jù)軟件功能要求，將系統(tǒng)軟件劃分為若干個相對獨立的部分，設(shè)計出合理的總體結(jié)構(gòu)，使軟件開發(fā)清晰、簡潔和流程合理；（2）培養(yǎng)良好的編程風(fēng)格，如考慮結(jié)構(gòu)化程序設(shè)計、實行模塊化、子程序化。LED數(shù)碼管有共陽、共陰之分。而在芯片內(nèi)部，XTAL1和XTAL2之間跨接晶體振蕩器和微調(diào)電容，從而構(gòu)成一個穩(wěn)定的自激振蕩器。簡易電子鐘的功能不復(fù)雜，采用其現(xiàn)有的I/O便可完成，所以本設(shè)計中采用此的設(shè)計方案。則初值X滿足（216X）1/12MHz12μs =50000μsX=15536→0011110010110000→3CB0H(2) 采用中斷方式進(jìn)行溢出次數(shù)累計,計滿20次為秒計時（1秒）；(3) 從秒到分和從分到時的計時是通過累加和數(shù)值比較實現(xiàn)。由于數(shù)字集成電路技術(shù)的發(fā)展和采用了先進(jìn)的石英技術(shù)，使數(shù)字鐘具有走時準(zhǔn)確、性能穩(wěn)定、攜帶方便等優(yōu)點，它還用于計時、自動報時及自動控制等各個領(lǐng)域。 實現(xiàn)時鐘計時的基本方法利用MCS51系列單片機(jī)的可編程定時/計數(shù)器、中斷系統(tǒng)來實現(xiàn)時鐘計數(shù)。 LED5 時個位 控制方案STC12C5A08S2的P0口和P2口外接由八個LED數(shù)碼管(LED8～LED1)構(gòu)成的顯示器，用P0口作LED的段碼輸出口，P2口作八個LED數(shù)碼管的位控輸出線，P1口外接四個按鍵A、B、C、D構(gòu)成鍵盤電路。當(dāng)作為I/O口使用時，第二功能信號引線應(yīng)保持高電平，與非門開通，以維持從鎖存器到輸出端數(shù)據(jù)輸出通路的暢通。分段式顯示器（LED數(shù)碼管）由7條線段圍成8字型，每一段包含一個發(fā)光二極管。故在按鍵較少時，采用圖29所示電路。unsigned int a=0,b=0,c=0,d=0,e=0,f=0,s=20。 while(1) { P2=0xfe。 P0=disp[10]。 if(b==6) { b=0。隨著生產(chǎn)力的發(fā)展，社會的進(jìn)步，生產(chǎn)生活對時鐘的需求越來越大，對時鐘的體型、功能的要求也各有不同。參 考 文 獻(xiàn)[1]t charge you more than 35% of your pensation s actions.CSKA said they were surprised and disappointed by Toure39。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時候是最后又打起了退堂鼓。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jumpWhen he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely.If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa hast另外，要做好一個課程設(shè)計，就必須做到：在設(shè)計程序之前，對所用單片機(jī)的內(nèi)部結(jié)構(gòu)有一個系統(tǒng)的了解，知道該單片機(jī)內(nèi)有哪些