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畢業(yè)設(shè)計-基于單片機的頻率計數(shù)器設(shè)計(完整版)

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【正文】 數(shù)以此類推,直到最后一次計算得到的余數(shù)即為十進制數(shù)的個位;第二步把第一步存儲的商組合成一個字節(jié),依次除以 10,仍然把每次得到的商存儲起來,以此類推最 后一次得到的余數(shù)即為十進制數(shù)的十位;以后也是以此類推得到十進制數(shù)的百位、千位 ?? 以上算法必須要注意的一個為題是,每次得到的余數(shù)與低位的半字節(jié)組合成一個字節(jié)時,余數(shù)必須放在該字節(jié)的高半字節(jié),否則計算錯誤。 ( 2) 把 “ 單片機系統(tǒng) ” 中的 - 74LS138的 A、 B、 C、引腳相連,再把譯碼器經(jīng)“非門” 與 “ 動態(tài)數(shù)碼顯示 ” 區(qū)域中的 6端口用 6芯排線連接 。另外還是用到排線若干,下載線及電源線。故輸入時鐘信號的最高頻率不得超過單片機晶振頻率的二十四分之一 ,最大計數(shù)值為 fOSC/24,由于 fOSC= 12MHz,因此: T1 的最大計數(shù)頻率為 。 設(shè)計要求: 1. 設(shè)計方案要合理、正確; 2. 系統(tǒng)硬件設(shè)計; 3. 完成必要元器件選擇; 4. 系統(tǒng)軟件設(shè)計及調(diào)試; 實驗目的 本應用系統(tǒng)實驗的目的是通過在“單片機原理及應用”課堂上學習的知識,以及查閱資料,培養(yǎng)一種自學的能力。 第二周 星期一:設(shè)計及上機調(diào)試。 設(shè)計要求: 1. 設(shè)計方案要合理、正確; 2. 系統(tǒng)硬件設(shè)計; 3. 完成必要元器件選擇 ; 4. 系統(tǒng)軟件設(shè)計及調(diào)試; 5. 寫出設(shè)計報告。 1 主要設(shè)計條件 1. MCS51 單片機實驗操作臺 1 臺; 2. PC 機及單片機調(diào)試軟件; 3. 單片機應用系統(tǒng)板 1 套; 4. 制作工具 1 套; 5. 系統(tǒng)設(shè)計所需的元器件。 星期二:調(diào)試,中期檢查。并且引導一種創(chuàng)新的思維,把學到的知識應用到日 常生活當中。對于頻率的概念就是在一秒只數(shù)脈沖的個數(shù),即為頻率值。 各部分方案選定、功能 單片機部分 本次設(shè)計采用了 AT89C51 單片機 , AT89C51是一種帶 4K字節(jié)閃爍可編程可擦除只讀存儲器的低電壓,高性能 CMOS8位微處理器。 9 ( 3) 把 “ 單片機系統(tǒng) ” 中的 ( T1)端子用導線連接到 “ 頻率 源 ” 的端子上。該本次頻率計系待測的時鐘信號的最高頻率為460800Hz,對應的十六進制數(shù)為 70800H,這里就以 70800H 轉(zhuǎn)換為十進制數(shù)為例來說明這種算法。 第三步:方法同第二步 ,得到十進制數(shù)的百位 8。 15 參考文獻 《單片機原理與應用》 王迎旭等編 機械工業(yè)出版社 《 51 系列單片機設(shè)計實例》 樓然苗等編 北京航空航天大學出版社 《計算機硬件技術(shù)基礎(chǔ)實驗教程》 黃勤等編 重慶大學出版社 《微型計算機接口技術(shù)及應用》 劉樂善主編 華中科技大學出版社 《單片微型計算機原理及接口技術(shù)》陳光東等 華中科技大學出版社 附錄 1 源程序清單: ADD A,25H MOV B,0AH DIV AB MOV 24H,A 。存儲第二位商 MOV A,B SWAP A 17 ANL 22H,0FH ADD A,22H MOV B,0AH DIV AB MOV 26H,A 。存儲十進制數(shù)十位 MOV A,24H SWAP A ADD A,25H MOV B,0AH DIV AB MOV 24H,A 。存儲十進制數(shù)萬位 MOV 55H,A 。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。s governing body, has also ordered an immediate investigation into the referee39。 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。想要的,不想要的,界限明確,好像沒有什么可以撼動自己。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。 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, 25 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 Mou
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