畢業(yè)設(shè)計(jì)-基于單片機(jī)的頻率計(jì)數(shù)器設(shè)計(jì)-全文預(yù)覽
【正文】 ound 5,000 feet (1,524 meters). 26 In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。 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 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。 From the corner at the beginning of deep friendship。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯(cuò)過，好像冥冥之中真的已經(jīng)注定。 A person39。 Then in high school, think don39。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。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。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。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 23 Watch mCayman Islandsbased Webb, the head of Fifa39。 g an employment tribunal clai Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。對(duì) 60H65H 清零 MOV R1,06H NEXT2: MOV R0,00H INC R0 DJNZ R1,NEXT2 MOV R0,50H。存儲(chǔ)第二位商 MOV 53H,B 。存儲(chǔ)第二位商 MOV A,B SWAP A ADD A,27H MOV B,0AH DIV AB MOV 26H,A 。存儲(chǔ)第三位商 MOV A,B SWAP A ADD A,28H 18 MOV B,0AH DIV AB MOV 27H,A 。存儲(chǔ)第四位商 MOV A,B SWAP A ANL 21H,0FH ADD A,21H MOV B,0AH DIV AB MOV 28H,A 。將十六進(jìn)制數(shù)轉(zhuǎn)換成十進(jìn)制數(shù) MOV A,23H MOV B,0AH DIV AB MOV 24H,A 。開放 EA、 T T0中斷 MOV TMOD,51H。為了解決這個(gè)問題，需要另外添加一段屏蔽高位的“ 0”的程序。 第五步：方法同第四步，得到十進(jìn)制數(shù)的萬位 6 和十萬位 4。 第二步：把存儲(chǔ)在 24H 與 25H 單元的商組合成一個(gè)字節(jié) 0BH。 70H 除以 10，商 BH 余 2H，把商 BH 存 儲(chǔ)在 25H單元，余數(shù) 2H 與 8H組合成一個(gè)字節(jié) 28H。 T1 計(jì)數(shù)程序的流程圖如圖 6 所示。 10 第 3 章 軟件系統(tǒng)設(shè)計(jì) 應(yīng)用系統(tǒng)的程序設(shè) 1s定時(shí) 采用 T0 定時(shí) 50ms ，連續(xù)循環(huán)定時(shí) 20 次即可完成 1s 定時(shí)，用一個(gè)計(jì)數(shù)單元 20H 存放循環(huán)的次數(shù)，每一次循環(huán) 20H 單元自減 1，當(dāng) 20H 單元為零時(shí)則 1s 定時(shí)到時(shí) 。 8 系統(tǒng)板上硬件連線 ： （ 1） 把 “ 單片機(jī)系統(tǒng) ” 中 的 － 動(dòng)態(tài)數(shù)碼 的段選 ABCDEFGH端口 。單片機(jī)AT89C51的 P0、 P2的 4個(gè) 8位并行 I/O口可進(jìn)行外部存儲(chǔ)設(shè)備擴(kuò)展。 頻率計(jì)系統(tǒng)總體框圖如下： 圖 1 頻率計(jì)系統(tǒng)總體框圖 段選 位選 AT89C51 單片機(jī) 外部脈沖信
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