【正文】 Those were broken into various shapes of stationery?？傆X得自己自己似乎應(yīng)該去做點什么，或者寫點什么。 TR0=1。n40) { RED_LED=1。 //開定時器中斷。 圖 10 仿真圖 X T A L 218X T A L 119A L E30EA31P S E N29RS T9P 0 .0 /A D 039P 0 .1 /A D 138P 0 .2 /A D 237P 0 .3 /A D 336P 0 .4 /A D 435P 0 .5 /A D 534P 0 .6 /A D 633P 0 .7 /A D 732P 1 . 01P 1 . 12P 1 . 23P 1 . 34P 1 . 45P 1 . 56P 1 . 67P 1 . 78P 3 .0 /R X D10P 3 .1 /T X D11P 3 .2 /I NT 012P 3 .3 /I NT 113P 3 .4 /T 014P 3 .7 / R D17P 3 . 6 / W R16P 3 .5 /T 115P 2 .7 /A 1 528P 2 .0 / A 821P 2 .1 / A 922P 2 .2 /A 1 023P 2 .3 /A 1 124P 2 .4 /A 1 225P 2 .5 /A 1 326P 2 .6 /A 1 427U1A T 8 9 C5 1D1L E D R E DR31 0 0D2L E D G RE E ND3L E D Y E L L O WR11 0 0R21 0 0R41 0 kC11nFC21nFX1CR Y S T A LC31nF基于 單片機的霓虹燈控制 系統(tǒng)設(shè)計 第 10 頁 5. 課設(shè)小結(jié) 及進一步設(shè)想 通過這次 緊張的 課程設(shè)計， 我收獲頗多，每天面對著電腦，翻閱各種相關(guān)資料 ，也親自動手焊接硬件， 體會頗深。當(dāng)電流通過導(dǎo)線 作用于這個晶片的時候，電子和空穴就會被推向量子阱，在量子阱內(nèi)電子跟空穴復(fù)合，然后就會以光子的形式發(fā)出能量，這就是 LED 發(fā)光的原理。 軟件部分， 由于采用的是 晶振的時鐘電路，單片機定時器的最大定時時間為 ，不能達到要求的閃爍頻率。 以 AT89C51單片機 為控制核心電路，應(yīng)用片內(nèi)定時器 實現(xiàn)對霓虹燈的控制 。單片機選用的是 AT89C51 單片機，利用其中的一個定時器設(shè)定燈光閃爍的時間， 時鐘電路選用的是 的晶振。 LED概述 LED（ Light Emitting Diode），發(fā)光二極管，是一種固態(tài)的半導(dǎo)體器件，它可以直接把電轉(zhuǎn)化為光。 X T A L 218X T A L 119A L E30EA31P S E N29R S T9P 0. 0/ A D 039P 0. 1/ A D 138P 0. 2/ A D 237P 0. 3/ A D 336P 0. 4/ A D 435P 0. 5/ A D 534P 0. 6/ A D 633P 0. 7/ A D 732P 1. 01P 1. 12P 1. 23P 1. 34P 1. 45P 1. 56P 1. 67P 1. 78P 3. 0/ R X D10P 3. 1/ T X D11P 3. 2/ I N T 012P 3. 3/ I N T 113P 3. 4/ T 014P 3. 7/ R D17P 3. 6 / W R16P 3. 5/ T 115P 2. 7/ A 1 528P 2. 0/ A 821P 2. 1/ A 922P 2. 2/ A 1 023P 2. 3/ A 1 124P 2. 4/ A 1 225P 2. 5/ A 1 326P 2. 6/ A 1 427U1A T 89 C 5 1C34. 7u FR140 0 圖 6 手 動復(fù)位電路 霓虹燈控制電路 霓虹燈控制電路用紅色、綠色、黃色 LED 發(fā)光二極管， 分別與 三個 470Ω的分壓電阻相串聯(lián)，分別 與單片機的 ， ， 口相連，如圖 7 所示： 圖 7 霓虹燈控制電路 基于 單片機的霓虹燈控制 系統(tǒng)設(shè)計 第 7 頁 3 軟件設(shè)計 調(diào)用中 斷子程序，設(shè)定中斷返回地址，中斷響應(yīng)時，執(zhí)行中斷服務(wù)程序；手動復(fù)位后，返回主程序。 TR0=1。 RED_LED=flicker。 n++。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。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯過，好 像冥冥之中真的已經(jīng)注定。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。 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。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