【正文】 t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there 西安航空職業(yè)技術(shù)學院 畢業(yè)設(shè)計（論文）任務(wù)書 題目： 基于單片機的電機轉(zhuǎn)速采集系統(tǒng) 任務(wù)與要求： 設(shè)計利用單片機對電機轉(zhuǎn)速的采集并分析數(shù)據(jù)從而監(jiān)測電機運行狀 況是否良好；運用傳感器技術(shù)測量轉(zhuǎn)速將信號轉(zhuǎn)換輸入到單片機中進行 處理后顯示在五位 LED 顯示器上。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 jump When 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。突然想到那件藍格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告了終結(jié)的邂逅計劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。 Have declared the end of the encounter that haven39。 Those were broken into various shapes of stationery。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心劑，或者說，是自以為是的精神寄托罷了。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。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個人的時候，自己的想法總是特別地清晰。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來，這個世界上，對某個事件能產(chǎn)生化學反應的，除了非做不可的堅決，還有，時間。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。t really grow up, it seems is not so important。 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?？傆X得自己自己似乎應該去做點什么，或者寫點什么。 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. 一字開頭的年齡已經(jīng)到了尾聲。s actions. CSKA said they were surprised and disappointed by Toure39。s 21 win. Michel Platini, president of European football39。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 antiracism taskforce, is in London for the Football Association39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。t agree with the disciplinary 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。 在本次畢業(yè)設(shè)計中，特別要感謝 王法杰老師 以及其他老師和同學給我的熱心幫助和 指導 ，才使得我的畢業(yè)設(shè)計能夠 順利 的完成。在 設(shè)計 中不斷發(fā)現(xiàn)問題進而解決問題，這是一個再學習的過程，其本身就是對自己的一次鍛煉，培養(yǎng)了自己獨立思考，動手解決問題的能力。而這正是我們學習理論知識的目的之所在。 整個畢業(yè)設(shè)計過程是對自己大學 三 年所學知識歸納總結(jié)和應用，也就是把理論知識用到實踐之中去。但看到自己 做的論文時， 一種成就感在心頭油然而生。 關(guān)于本次畢業(yè)設(shè)計，感受頗多。 延時 1ms 子程序 DL: MOV R6, 0FFH DL6: DJNZ R6, DL6 DJNZ R7, DL RET PC 機的通信程序 單片機程序清單如下： ORG 3000H MAIN： MOV TMOD， 20H ； 在 下，串行接口波特率 MOV TH1， 0FDH ； 9600bps，方式 3 MOV TL1， 0FDH MOV PCON， 00H SETB TR1 MOV SCON， 0D8H LOOP： JBC RI， RECEIVE ； 接收到數(shù)據(jù)后立即發(fā)出去 SJMP LOOP RECEIVE： MOV A， SBUF MOV SBUF， A SEND： JBC TI， SENDEND SJMP SEND SENDEND： SJMP LOOP 結(jié) 束 語 本文介紹的單片機 在電機轉(zhuǎn)速 采集系統(tǒng) 這一領(lǐng)域的應用， 具有硬件電路簡單、成本低廉、編程方便、通信可靠性高的特點，實現(xiàn)了 單片機對電機轉(zhuǎn)速的 采集 以及和 PC通信 的數(shù)據(jù)傳送。 未到，掃描碼左移 1 位 MOV R3, A 。 JB , ELD1 。 調(diào)用延時子程序 INC R0 。 取出字型碼 MOVX DPTR, A 。 取欲顯示的數(shù)據(jù) ADD A, 0DH 。 送掃描值 INC DPTR 。 LD0: MOV DPTR, 7F01H 。 顯示數(shù)據(jù)緩沖區(qū)首地址送 R0 MOV R3， 01H 。 雙字節(jié)整數(shù)拆分程序流程圖如圖 54 圖 5－ 4 雙字節(jié)整數(shù)拆分程序流程圖 顯示程序流程圖如圖 55所示： 程序設(shè)計 根據(jù)以上設(shè)計思路和各個模塊的流程圖即可編寫出本次畢業(yè)設(shè)計的程序，注意其中各個模塊間的參數(shù)傳遞以及堆棧指針等問題，程序設(shè)計的任務(wù)即可完成，寫 出初始的程序，再進行上機調(diào)試， 程序清單將在 下一章節(jié) 中加以詳細敘述。在程序設(shè)計中，在AT89C51RAM 存貯器中的四個顯示緩沖器單元 30H－ 34H，分別存放著由計算出來的轉(zhuǎn)速的 BCD 碼進行拆分后的非壓縮 BCD 碼數(shù)據(jù)， AT89C51 的 P1 口掃描輸出總開始 0R R R6 16R7 C（ R2R3）左移 1 位（移出位 bi在 C 中） 2*（ R4R5R6） +C R4R5R6（十進制運算） （ R