畢業(yè)設(shè)計(jì)-基于at89c51單片機(jī)的秒表設(shè)計(jì)-免費(fèi)閱讀
【正文】 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。嫌惡過(guò)自己的怯懦，最終卻發(fā)現(xiàn)有很多緣分，有很多錯(cuò)過(guò)，好像冥冥之中真的已經(jīng)注定。 Then in high school, think don39。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 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。if you win the case.If you are thinking about signing up for Dismissal.You can make a claim to an employment tribunal, even if you haven39。 } else return 0。 return 0。 if(key3==0) { f_k3=0。 }}char scan_key2(void){ if(key2==0) { delay(100)。void delay(char i){while(i)。sbit key2=P1^1。 TR0=0。 Display_FiveNum(0xb8,0x80,0,0)。TR0==1) {led1=~led1。 iniLCD()。}} void init(void){ TMOD=0x01。} } void recover_second(char i){ if(i==1) {m=save1_m。 m++。 //k display_FH(0xba,0xB4,FH[3])。 //單 display_HZ(0xb8,0x50,HZ[1])。extern scan_key4()。sbit led=P3^0。學(xué)習(xí)的時(shí)候不怎么理解，但是在實(shí)踐中應(yīng)用了以后就自然了解了。除了常見(jiàn)錯(cuò)誤，還有些錯(cuò)誤在平時(shí)沒(méi)遇到過(guò)的?？删幊檀型ǖ馈 ? 壽命：1000寫(xiě)/擦循環(huán) 該器件采用ATMEL高密度非易失存儲(chǔ)器制造技術(shù)制造，與工業(yè)標(biāo)準(zhǔn)的MCS51指令集和輸出管腳相兼容。采用的是AT89C51單片機(jī)，有按鍵部分和顯示部分。設(shè)計(jì)要求1. 設(shè)計(jì)方案要合理、正確；2. 系統(tǒng)硬件設(shè)計(jì)；3. 完成必要元器件選擇；4. 系統(tǒng)軟件設(shè)計(jì)及調(diào)試；5. 寫(xiě)出設(shè)計(jì)報(bào)告。本次采用的是AT89C51單片機(jī)：AT89C51是一種帶4K字節(jié)FLASH存儲(chǔ)器（FPEROM—Flash Programmable and Erasable Read Only Memory）的低電壓、高性能CMOS 8位微處理器，俗稱單片機(jī)。主要特性：32可編程I/O線 以上是實(shí)現(xiàn)顯示功能，：五、 器件說(shuō)明（1） MCS51單片機(jī)實(shí)驗(yàn)操作臺(tái)1臺(tái)；（2） PC機(jī)及單片機(jī)調(diào)試軟件；（3） 單片機(jī)應(yīng)用系統(tǒng)板1套；（4） 制作工具1套；（5） 系統(tǒng)設(shè)計(jì)所需的元器件。剛開(kāi)始以為可以用匯編很容易就寫(xiě)出來(lái)，以為學(xué)的很明白了，但是用匯編時(shí)才發(fā)現(xiàn)原來(lái)都不怎么熟練，編了一會(huì)程序發(fā)現(xiàn)只有一種感覺(jué)——舉步維艱??！還是放棄匯編選擇C語(yǔ)言吧！對(duì)于單片機(jī)，我們課本學(xué)習(xí)的是80C51，但是這次做課程設(shè)計(jì)用的是89C51，這樣不僅使我們掌握了80C51，而且對(duì)89C51也有了一定的了解了，在課堂上學(xué)習(xí)的都理論的，跟實(shí)際永遠(yuǎn)有一定的差距，不實(shí)踐就不會(huì)發(fā)現(xiàn)問(wèn)題。sbit led1=P3^4。extern scan_key1()。i)。 //程 display_FH(0xba,0x60,FH[0])。 display_HZ(0xbc,0xB0,HZ[8])。save2_s=s。s=save3_s。 TR0=0。 if(scan_key1()==1)
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