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功能,又兼容低級語言的許多功能,可用來編寫系統(tǒng)軟件。如圖31所示。Proteus ISIS的工作界面是一種標(biāo)準(zhǔn)的Windows界面。仿真圖如圖32所示。通過反復(fù)調(diào)試,發(fā)現(xiàn)并排除軟件與硬件存在的各類問題,以滿足系統(tǒng)設(shè)計(jì)的預(yù)期目的。接上電源,按一下開始按鈕。這次的畢業(yè)設(shè)計(jì)讓我學(xué)到了許多東西,讓我知道了做什么事都要細(xì)心、耐心,一個畢業(yè)設(shè)計(jì)需要許多方面的幫助才能完成,最后再次向所有幫助過我的老師同學(xué)學(xué)表示感謝。sbit d1 = P3^0。 TMOD amp。 switch(j) { case 0: d1 = 0。P3=0xff。j++。break。 int_init()。i200。 a[3] = sec/1000%10。Dismissal.You can make a claim to an employment tribunal, even if you haven39。if you win the case.If you are thinking about signing up for s Premier League match at Chelsea on Sunday.I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport.For me it39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。 Then in high school, think don39。嫌惡過自己的怯懦,最終卻發(fā)現(xiàn)有很多緣分,有很多錯過,好像冥冥之中真的已經(jīng)注定。Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.The supersonic descent could happen as early as Sunda.The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform.Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。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。想要的,不想要的,界限明確,好像沒有什么可以撼動自己。 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。s governing body, has also ordered an immediate investigation into the referee39。s antiracism taskforce, is in London for the Football Association39。damagesbased agreement. In England and Wales, your solicitor can39。t agree with the disciplinary action your employer has taken against you a[1] = sec/10%10。 counter++。 default: break。P2 = number[a[4]]。break。j++。 EA = 1。sbit sw=P1^0。 uint16 counter = 0。在論文的格式和排版問題有很多小地方的錯誤,經(jīng)過老師的耐心指導(dǎo),終于完成了畢業(yè)設(shè)計(jì)。然后把整個的設(shè)計(jì)程序都加載到單片機(jī)上去調(diào)試。程序運(yùn)行后,觀察有無顯示,時鐘是否工作,運(yùn)行結(jié)果是否正確。單擊“三角形按鈕”進(jìn)行仿真。總之,該軟件是一款集單片機(jī)和SPICE分析于一身的仿真軟件,功能極其強(qiáng)大。它既有高級語言的基本特點(diǎn),又具有匯編語言面向硬件和系統(tǒng),可以直接訪問硬件的功能。程序員應(yīng)當(dāng)仔細(xì)檢查程序,保證其正確,而不要過分依賴C語言編譯程序去查錯。此外,C語言還允許用戶自己定義數(shù)據(jù)類型。首先是考慮到對C語言程序的編寫比匯編要熟識的多,當(dāng)然對于程序的編寫C語言也會方便簡單易懂的多。而另外的開始鍵和暫停鍵兩鍵使用了外部中斷,這兩個I/O口的第二功能分別為單片機(jī)的外部中斷1端口和外部中斷0端口。圖26 顯示電路由于本設(shè)計(jì)需要采用兩個三位數(shù)碼管顯示時間,如果靜態(tài)顯示則占用的口線多,硬件電路復(fù)雜,所以采用動態(tài)顯示。這不僅能使單片機(jī)復(fù)位,而且還能使單片機(jī)的外圍芯片也同時復(fù)位。 第19腳OE,使能端,若該腳為“1”A/B端的信號將不導(dǎo)通,只有為“0”時A/B端才被啟用,該腳也就是起到開關(guān)的作用?! TAL1:反向振蕩放大器的輸入及內(nèi)部時鐘工作電路的輸入。另外,該引腳被略微拉高。當(dāng)振蕩器復(fù)位器件時,要保持RST腳兩個機(jī)器周期的高電平時間。P2口當(dāng)用于外部程序存儲器或16位地址外部數(shù)據(jù)存儲器進(jìn)行存取時,P2口輸出地址的高八位。P0能夠用于外部程序數(shù)據(jù)存儲器,它可以被定義為數(shù)據(jù)/地址的第八位。兩個16位定時器/計(jì)數(shù)器 與MCS51 兼容 其硬件電路主要有主控制器,顯示電路和回零、啟動、查看、停表電路等。計(jì)時通過中斷完成,定時溢出中斷周期為1ms,當(dāng)一處中斷后向CPU發(fā)出溢出中斷請求,每發(fā)出一次中斷請求就對毫秒計(jì)數(shù)單元進(jìn)行加一,達(dá)到10次就對十毫秒位進(jìn)行加一,依次類推。實(shí)際中應(yīng)盡量以軟件替代硬件來降低成本。如數(shù)控機(jī)床就是典型實(shí)例。外部總線增加了I2C(InterIntegrated Circuit)及SPI(Serial Peripheral Interface)等串行總線方式,進(jìn)一步縮小了體積,簡化了結(jié)構(gòu)。 AT89C51單片機(jī)的特點(diǎn)有優(yōu)異的性能價格比。在此利用了2個按鍵分別對各個功能進(jìn)行控制,顯示部分用數(shù)碼管,用的是2個三位數(shù)碼管,主要是為了方便實(shí)物制作。本設(shè)計(jì)利用AT89C51單片機(jī)的定時器/計(jì)數(shù)器定時和記數(shù)的原理,使其能精確計(jì)時。鑒于當(dāng)今計(jì)時技術(shù)的快速發(fā)展,即便千分之一秒(為眨眼的40倍)的毫微差距,也決定著冠軍的歸屬。最后通過對硬件系統(tǒng)的仿真觀察其實(shí)際運(yùn)行情況,給人們以直觀的認(rèn)識。電子秒表的使用功能比機(jī)械秒表要多,它不僅能顯示分、秒,還能顯示時、日、月及星期,并且有1/l00s的功能。本文闡述了基于單片機(jī)的數(shù)字電子秒表設(shè)計(jì)。有關(guān)計(jì)時鐘表的發(fā)展歷史,大致可以分為三個演變階段。顯示電路由兩個共陰極數(shù)碼管組成。 單片機(jī)概述電子計(jì)算機(jī)是20世界紀(jì)40年代發(fā)展起來的新技術(shù)之一,它的出現(xiàn)是科學(xué)技術(shù)產(chǎn)生了一場深刻的革命。另外,其體積小,對于強(qiáng)磁場環(huán)境易于采取屏蔽措施,適合在惡劣環(huán)境下工作。它的應(yīng)用遍及各個領(lǐng)域,主要表現(xiàn)在以下幾個方面:單片機(jī)在智能儀表中的應(yīng)用單片機(jī)在機(jī)電一體化中的應(yīng)用單片機(jī)在實(shí)時控制中的應(yīng)用單片機(jī)在分布式多機(jī)系統(tǒng)中的應(yīng)用單片機(jī)在人類生活中的應(yīng)用單片機(jī)已成為計(jì)算機(jī)發(fā)展和應(yīng)用的一個重要方面,另一方面,單片機(jī)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(jì)思想和設(shè)計(jì)方法。國內(nèi)普及的幾乎都是Intel公司的產(chǎn)品。根據(jù)以上原則,通過分析與比對,我們選用較熟悉的具有內(nèi)部程序存儲器的AT89C51單片機(jī)作為主控電路,選用兩個三位共陰極數(shù)碼管作為顯示電路來組成硬件電路。復(fù)位鍵主要功能在于數(shù)值定,需要比較準(zhǔn)確的控制。 AT89C51是一種帶4K字節(jié)閃爍可編程可擦除只讀存儲器(FPEROM—Falsh Programmable and Erasab