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畢業(yè)設(shè)計(jì)-基于at89s51單片機(jī)電子時(shí)鐘設(shè)計(jì)(留存版)

  

【正文】 ciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。 The end of our life, and can meet many things really do? 而窮盡我們的一生,又能遇到多少事情是真正地非做不可? During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可,只是青蔥年華里自己給自己注射的一支強(qiáng)心劑,或者說(shuō), 是自以為是的精神寄托罷了。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開(kāi)頭的年齡 已經(jīng)到了尾聲。高等教育出版社。通過(guò)這次課程設(shè)計(jì),我們知道了理論和實(shí)際的距離,也知道了理論和實(shí)際想結(jié)合的重要性,也從中得知了很多書本上無(wú)法得知的知識(shí),通過(guò)以實(shí)踐相結(jié)合,理論問(wèn)題即實(shí)踐課題,解決問(wèn)題即課程研究,通過(guò)自己的手來(lái)解決問(wèn)題比用腦子解決問(wèn)題更加深刻,加強(qiáng)我們的動(dòng)手能力和解決問(wèn)題的能力。8毫秒 *32= DL05S1: LCALL DISPLAY DJNZ R3,DL05S1 RET END 。取段碼表地址 MOVC A,A+DPTR 。等待調(diào)小時(shí)按鍵時(shí)時(shí)鐘顯示用 AJMP SET6 SETOUT1: LCALL DISPLAY 。等待鍵釋 放 LCALL DISPLAY 。返回主程序( LED 數(shù)據(jù)顯示亮) SETHH: CLR 00H 。調(diào)用加 1子程序 MOV A,R3 。 。數(shù)據(jù)放入當(dāng)削地址單元中 RET 。 。 RETI 。 。時(shí)數(shù)據(jù)放入 A CLR C 。指向秒計(jì)時(shí)單元( 71H72H) 本科學(xué)年論 文 第 14 頁(yè) ACALL ADD1 。 。設(shè) T0、 T1為 16位定時(shí)器 MOV TL0,0B0H 。串行中斷程序返 回 。雖然這些字符是在不同時(shí)刻出現(xiàn)的,而 本科學(xué)年論 文 第 9 頁(yè) 在同一時(shí)刻,只有一位顯示,其他各位熄滅,但由于 LED 的余輝和人眼的視覺(jué)暫留作用 ,只要每位顯示間隔足夠短,則可以造成多位同時(shí)亮的假象,達(dá)到同時(shí)顯示的效果。 如圖 32所示, AT89S51 有 40 引腳,雙列直插( DIP)封裝 ,所用引腳功能如下: 1. VCC —— 運(yùn)行時(shí)加+ 2. GND —— 接地 3. XTAL1 —— 振 蕩 器 反 相 放 大 器 及 內(nèi) 部 時(shí) 鐘 發(fā) 生 器 的 輸 入 端 4. XTAL2 —— 振蕩器反相放大器的輸出端 5. RST —— 復(fù)位輸入,高電平有效,在晶振工作時(shí),在 RST 引腳上作用 2 個(gè)機(jī)器周期以上的高電平,將使單片機(jī)復(fù)位。比如 A/D、 PWM、 PCA(可編程計(jì)數(shù)器陣列)、 WDT(監(jiān)視定時(shí)器 看家狗)、高速 I/O口及計(jì)數(shù)器的捕獲 /比較邏輯等。該方式每一位都需要一個(gè) 8 位輸出口控制。數(shù)碼管顯示的時(shí)間簡(jiǎn)單明了而且讀數(shù)快、時(shí)間準(zhǔn)確顯示到秒。 基于硬件電路的考慮,本設(shè)計(jì)采用完全用軟件實(shí)現(xiàn)數(shù)字時(shí)鐘。因此,單片機(jī)只需要和適當(dāng)?shù)能浖巴獠吭O(shè)備相結(jié)合,便可成為一個(gè)單片機(jī)控制系統(tǒng)。省電模式中,片內(nèi) RAM將被凍結(jié),時(shí)鐘停止振蕩,所有功能停止工作,直至系統(tǒng)被硬件復(fù)位方可繼續(xù)運(yùn)行。這樣,在同一時(shí)刻, 6 位 LED 中只有選通的那 1 位顯示出字符,而其他 5位則是熄滅的。定時(shí)器 T0中斷程序入口 LJMP INTT0 。 MOV 20H,00H 。 。開(kāi)啟定時(shí)器 T0 DJNZ R4, OUTT0 。大于或等于 60分時(shí)分計(jì)時(shí)單元清 0 MOV R0,79H 。 。 MOV 75H,79H 。 。指向當(dāng)前地址單元 SWAP A 。 。有鍵按下,延時(shí) JNB ,SETHH 。有鍵按下,調(diào)顯示子程序延時(shí)削抖 JB ,CLOSE 。大于或等于 24時(shí)清 0操作 AJMP SET6 。等待調(diào)分按鍵時(shí)時(shí)鐘顯示用 AJMP SET4 SET5: LCALL DISPLAY 。掃描字放入 A MOV P2,A 。1MS 延時(shí)程序, LED 顯示程序用 DL1MS: MOV R6,14H DL1: MOV R7,19H DL2: DJNZ R7,DL2 DJNZ R6,DL1 RET 。 結(jié)論 在這次設(shè)計(jì)中,我采用了 LED 數(shù)碼管顯示時(shí)、分、秒,以 24 小時(shí)計(jì)時(shí)方式,根據(jù)數(shù)碼管動(dòng)態(tài)顯示原理來(lái)進(jìn)行顯示,以 AT89S51 芯片為核心,輔以必要的電路,設(shè)計(jì)了一個(gè)簡(jiǎn)易的電子時(shí)鐘,它由 直流電源供電,通過(guò)數(shù)碼管能夠準(zhǔn)確顯示時(shí)間,調(diào)整時(shí)間,并在數(shù)碼管上顯示相應(yīng)的時(shí)間。電路原理圖與電路設(shè)計(jì)教程 Protel 99SE[M] 。s governing body, has also ordered an immediate investigation into the referee39。想要的,不想要的,界限明確,好像沒(méi)有什么可以撼動(dòng)自己。 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。 Then in high school, think don39。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. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。模擬電子 技術(shù)基礎(chǔ)。板子所留出來(lái)的電源插口用 VCC(表示電源正)和 GND(表示電源負(fù))標(biāo)明。A 中數(shù)據(jù)循環(huán)左移 MOV R5,A 。 本科學(xué)年論 文 第 18 頁(yè) 。關(guān)定時(shí)器 T1中斷 SETB TR0 。按下時(shí)間小于 1小時(shí)操作 LCALL ADD1 。跳轉(zhuǎn)到 SET4循環(huán) CLOSEDIS: SETB ET0 。進(jìn)入調(diào)時(shí)狀態(tài),賦閃爍定時(shí)初值 SETB ET1 。對(duì)計(jì)時(shí)單元復(fù)零用 CLR0: CLR A 。A 加 1操作 D
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