【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 17 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. 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(jīng)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(qiáng)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 16 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(gè)人的時(shí)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(jīng)到了尾聲。s 21 win. 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。 在此次的畢業(yè)設(shè)計(jì)中，金江老師在設(shè)計(jì)過程中給予了我正確的指導(dǎo)，在眾多方面提供了方便和便利，為論文的合理性 、可行性和完善性提供了有利的幫助。進(jìn)一步提高了自己在實(shí)際設(shè)計(jì)過程中研究問題、發(fā)現(xiàn)問題、解決問題的能力。圖形或文字顯示有靜止、移入移出等顯示方式。從控制電路到列驅(qū)動(dòng)器的數(shù)據(jù)傳輸可以采用并列方式或串行方式。當(dāng)這樣輪回的速度足夠快（每秒 24 次以上）， 由于人眼的視覺暫留現(xiàn)象，就能夠看到顯示屏上穩(wěn)定的圖形了。這個(gè)數(shù)字很龐大，因?yàn)槲覀儍H僅是16ｘ 16 的點(diǎn)陣，在實(shí)際應(yīng)用中的顯示屏往往要大得多，這樣在鎖存器上花的成本將是一個(gè)很龐大的數(shù)字。其主程序流程如圖 33所示。 SDA 為串行數(shù)據(jù) /地址，這是一個(gè)雙向傳輸端，用于傳送地址和所有數(shù)據(jù)的發(fā)送或接收。 該芯片有 兩種寫入方式 ， 一種是字節(jié)寫入方式 ， 還有另一種頁寫入方式 。它克服了常用的 281 281 2864 等并行 EEPROM器件價(jià)格高、體積大、可靠性低（這些器件如不采取措施，在上電、下電時(shí)常會(huì)丟失數(shù)據(jù)）等不足，在速度要求不是很高的情況下，該器件是最理想的選擇。 7 第三章 單片機(jī)的 LED 點(diǎn)陣顯示設(shè)計(jì) 第一節(jié) 設(shè)計(jì)任務(wù) （一） LED驅(qū)動(dòng)模塊 采用動(dòng)態(tài)掃描方式，通過三極管驅(qū)動(dòng)并聯(lián)在一起的 LED 發(fā)光管的一端 (共陰或共2端 )， LED發(fā)光管的另一腳接通用 I/O口，控制其亮滅。該反向放大器可以配置為片內(nèi)振蕩器。在 FLASH編程期間，此引腳也用于施加 12V編程電源（ VPP）。在由外部程序存儲(chǔ)器取指期間，每個(gè)機(jī)器周期兩次 /PSEN 有效。此時(shí)， ALE只有在執(zhí)行 MOVX，MOVC 指令是 ALE 才起作用。在平時(shí)， ALE端以不變的頻率周期輸出正脈沖信號(hào)，此頻率為振蕩器頻 率的 1/6。 6 RST：復(fù)位輸入。 P3 口： P3 口管腳是 8 個(gè)帶內(nèi)部上拉電阻的雙向 I/O 口，可接收輸出 4 個(gè) TTL 門電流。這是由于內(nèi)部上拉的緣故。 P1口管腳寫入 1后，被內(nèi)部上拉為高，可用作輸入， P1口被外部下拉為 低電平時(shí)，將輸出電流，這是由于內(nèi)部上拉的緣故。當(dāng) P1 5 口的管腳第一次寫 1 時(shí)，被定義為高阻輸入。因此，在智能化電子設(shè)計(jì)與制作過程中經(jīng)常用到 AT89C51 芯片。 4 第二 節(jié) AT89C51 單片機(jī)概述 （一） AT89C51 單片機(jī)的結(jié)構(gòu) AT89C51 是 一 種 帶 4KB 閃 爍 可 編 程 可 擦 除 只 讀 存 儲(chǔ) 器(FalshProgrammableandErasableReadOnlyMemory， FPEROM)的低電壓、高性能 CMOS型 8位微處理器，俗稱單片機(jī)。室外顯示屏基本上采用靜態(tài)鎖存技術(shù)，即每一個(gè)發(fā)光一極管都對(duì)應(yīng)有一個(gè)驅(qū)動(dòng)寄存器，無需時(shí)分工作，從而保證了每一個(gè)發(fā)光一極管的亮度占空比為 100%。日前普遍采用串行控制技術(shù)，顯示屏每個(gè)單元內(nèi)部的不同驅(qū)動(dòng)電路和各級(jí)聯(lián)單元之間，每個(gè)時(shí)鐘僅傳送一位數(shù)據(jù)。 3．主流與多品種共存 現(xiàn)在雖然單片機(jī)的品種繁多，各具特色，但仍以 MCS51為核心的單片機(jī)占主流，兼容其結(jié)構(gòu)和指令系統(tǒng)的有 PHILIPS 公 司的產(chǎn)品， ATMEL 公司的產(chǎn)品和中國(guó)臺(tái)灣的WinBond 系列單片機(jī)。 CMOS 雖然功耗較低，但由于其物理特征決定其 2 工作速度不夠高，而 CHMOS則具備了高速和低功耗的特點(diǎn)，更適合于在要求低功耗像電池供電的應(yīng)用場(chǎng)合。單片機(jī)在智能儀表、實(shí)時(shí)控制、機(jī)電一體化、辦公機(jī)械、家用電器等方面都有相當(dāng)?shù)膽?yīng)用領(lǐng)域。最早的設(shè)計(jì)理念是通過將大量外圍設(shè)備和 CPU集成在一個(gè)芯片中，使計(jì)算機(jī)系統(tǒng)更小，更容易集成進(jìn)復(fù)雜的