【正文】 ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. 基于 單片機的霓虹燈控制 系統(tǒng)設計 第 18 頁 If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。 Have declared the end of the encounter that haven39。那些曾經所謂的非做不可，只是青蔥年華里自己給自己注射的一支強心劑，或者說，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個人的時候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而窮盡 我們的一生，又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經到了尾聲。s 21 win. 基于 單片機的霓虹燈控制 系統(tǒng)設計 第 16 頁 Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。 } TH0=0x3C。 i++。 GREEN_LED=1。 GREEN_LED=flicker。 } if(20=namp。amp。 YELLOW_LED=1。 //開總中斷 } void main() //主函數(shù)。 //啟動定時器。 void int0() { TMOD=0x01。 //端口定義。 在課設開始的前期，也遇到了麻煩，比如說， LED 閃爍時間不符合要求， C 語言編程不太熟練， 很感謝徐濤老師的耐心教導，他的幽默讓我們覺得親切，他的認真負責讓我們折服。 圖 8 中斷服務程序流程圖 Red led=flicker Red led=flicker 中斷響應 設置中斷返回地址 中斷 返回 基于 單片機的霓虹燈控制 系統(tǒng)設計 第 8 頁 Y N TH0,TL0 裝初值 開中斷，啟動 T0 開始 0≤ n20 Red led=flicker Y N 20≤ n40 Green led=flicker Y N 40≤ n60 Yellow led=flicker TMOD 初始化 基于 單片機的霓虹燈控制 系統(tǒng)設計 第 9 頁 圖 9 霓虹燈控制電路主程序流程圖 調試 在 protues 上進行仿真實驗。本系統(tǒng)采用的為 ，一個機器周期為 1us， C C2為 22PF。 I/O 存儲器 EPROM/ROM 定時 /計數(shù)器 運算器 控制器 中斷 CPU 片內振蕩器 RAM/SFP 并行口 存儲器擴展控制器 串行口 XTAL 基于 單片機的霓虹燈控制 系統(tǒng)設計 第 5 頁 近十幾年來，為了開發(fā)藍色高亮度發(fā)光二極管，世界各地相關研究的人員無不全力投入。 它是一種通過控制半導體發(fā)光二極管的顯示方式，用來顯示文字、圖形、圖像、動畫、行情、視頻、錄像信號等各種信息的顯示屏幕。 LED 的心臟是一個半導體的晶片，晶片的一端附在一個支架上，一端是負極，另一端連接電源的正極，使整個晶片被環(huán)氧樹脂封裝起來。 RST：即為 RESET，該引腳為單片機的上電復位或掉電保 護端。AT89C51 相當于將 8051 中的 4KB ROM 換成相應數(shù)量的 Flash 存儲器，其余結構、供電