【正文】 信號的軟件實現(xiàn)方法。通過控制其中某一個計數(shù)器和工作寄存器，而實現(xiàn)從 AT89C51 的任意輸出口輸出不同占空比的脈沖波形 ,能夠有效的節(jié)省單片機的資源。軟件的基本思想是：首先將 T0 計數(shù)器進行初始化使之對一基準時間計數(shù)，然后根據(jù)所需占空比對工作寄存器 R R R R5 附值（ R R5 用于重裝 R R3 的值） ，然后根據(jù)寄存器R R3 中值的遞減控制 P1 口輸出 PWM 脈沖 的占空比。 大連民族學院本科畢業(yè)設計（論文）題目 –21– 速度顯示輸出 通過輸入脈沖信號來進行控制的， 即電機的總轉動角度 ， 它將脈沖信號轉變成角位移，即給一個脈沖信號，步進電機就轉動一個角度 。 由輸入脈沖數(shù)決定，而電機的轉速由脈沖信號頻率決定。如果給步進電機發(fā)一個控制脈沖，它就轉一步，再發(fā)一個脈沖，它會再轉一步。兩個脈沖的間隔越短，步進電機就轉得越快。調整單片機發(fā)出的脈沖頻率，就可以對步進電機進行調速。 并通過 LCD12864 輸出當前速度。 大連民族學院本科畢業(yè)設計（論文）題目 –22– 結束語 本設計綜合了５１系列單片機的端口控制技術，從總體上分析和講解了單片機應用的 硬件、軟件設計原則思想和匯編程序設計方法。本設計系統(tǒng)的描述了具 備單片機電機控制系統(tǒng)較為完整體系結構的按摩機控制系統(tǒng)的基本功能 。本設計結合考慮了實現(xiàn)按摩機功能的前提下保障系統(tǒng)良好的可操作性和安全性。 至此本次設計即將全部結束，基本上完成了選題時所列出的計劃任務。選擇設計這個課題，除了要很好地運用了所學的單片機知識結構和原理以及指令系統(tǒng)之外，還要把電子線路技術、模擬電子技術、數(shù)字電子技術、高頻電子技術等基礎課程的知識綜合運用其中。通過本次畢業(yè)設計，不但對以前所學的知識進行了很好的鞏固和復習，而且提高了動腦動手能 力，達到了理論聯(lián)系實踐的目的。最重要的是培養(yǎng)了我們系統(tǒng)分析和設計開發(fā)的思維能力，為以后能更好地學習和開發(fā)單片機技術打下良好的基礎，為將來能在社會上有一席之地做了準備。 總之，本次設計無論從知識結構組成，還是系統(tǒng)構架原理， 或技術思維分析等方面都具備了一定的基礎水平，當然亦有某些技術要素、分析手段和思想設計等重大方面的不足和缺陷。限于本人水平不高，有待日后繼續(xù)學習，努力提高自我分析設計思維能力，不斷完善和豐富自我學識。 大連民族學院本科畢業(yè)設計（論文）題目 –23– 參 考 文 獻 [1] 王曉明 .電動機的單片機控制 [M]. 北京 :北京航空航天大學出版社， 2021. 5 [2] 趙影 . 電機與電力拖動 . [M] 北京 :國防工業(yè)出版社， 2021. 7 [3] 夏繼強 . 單片機實驗與實踐教程 [M]. 北京：北京航空航天大學出版社 , 2021． [4] 何立民 . 單片機高級教程 [M]．北京：北京航空航天大學出版社， 2021． [5] 于鳳明．單片機原理及接口技術 [M]．北京：中國輕 工業(yè)出版社． 1998． [6] 肖洪兵 . 跟我學用單片機 [M]. 北京：北京航空航天大學出版社 ,． [7] 胡漢才．單片機原理與接口技術 [M]．北京：清華大學出版社， ． [8] 樓然苗等． 51 系列單片機設計實例 [M]．北京：北京航空航天出版社， ． [9] 趙曉安 . MCS51 單片機原理及應用 [M]. 天津：天津大學出版社， ． [10]李廣第． 單片機基礎． 第 1 版．北京：北京航空航天大學出版社， 1999 [11]徐惠民、安德寧． 單片微型計算機原理接口與應用． 第 1版． 北京：北京郵電大學出版社，1996 [12]劉寶廷 ,程樹康 . 步進電動機及其驅動控制系統(tǒng) [M ]. 濱 :哈爾濱工業(yè)大學出版社 , 1997: 37 70. [13] AT89C51 DATA SHEEP Philips Semiconductors [14]Yang. Y., Yi. J., Woo, ., and Kim. B.: ?Optimum design for linearityand efficiency of microwave Doherty amplifier using a new loadmatching technique?, Microw. J., 2021, 44, (12), pp. 20–36 [15] Vizimuller, P.: ?RF design guidesystems, circuits, and equations? (ArtechHouse, Boston, MA, 1995)[6]R. Dye, “Visual ObjectOrientated Programming,” Dr. Dobbs MacintoshJournal, Sept. 1st ( 1991). 大連民族學院本科畢業(yè)設計（論文）題目 –24– 致謝 為期三個多月的畢業(yè)設計即將結束，也預示著四年的大學學習生活將要畫上一個圓滿的句號。在整個求學期間，我的 老師 一直不遺余力地幫助我，我前進的每一步都飽蘸他們期待和鼓勵的關切之情。在此還要著重感謝學校給我提供的良好的學習生活環(huán)境和本次畢業(yè)設計的機會，感謝指導老師們的 悉心指導及此次參加畢業(yè)設計的同學的無私幫助。 在本次畢業(yè)設計期間，我得到許多老師和同學的指導和幫助，特別是我的指導老師薛原老師 ， 她 以淵博的學識和豐富的實踐經(jīng)驗給我的畢業(yè)設計提供了很多寶貴的指導性意見和建議，同時也教會了我如何從事本專業(yè)的課題研究，如何將理論與工程實踐相結合以滿足設計要求。 總之這次畢業(yè)設計讓我受益匪淺。當然限于本人水平、經(jīng)驗和實踐的有限，本設計還存在有許多的不完善之處，請各位老師審定、批評指正和提出寶貴意見，再次謝謝！ 大連民族學院本科畢業(yè)設計（論文）題目 –25– 為你提供優(yōu)秀的畢業(yè)論文參考資料，請您刪除以下內(nèi)容， O(∩ _∩ )O 謝謝！！！ A large group of tea merchants on camels and horses from Northwest China39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2021. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。s performers of the troupe still tour the region39。s villages and entertain nomadic families, but their fame has spread around the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his