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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. 25 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(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。 隨著電子技術(shù)的發(fā)展,各種智能鎖(如指紋識別,鞏膜識別等)相繼問世,但這些產(chǎn)品的特點是針對特定人員有效。先寫進 NOP NOP POP ACC POP PSW RET 。CPU RAM 首地址 MOV R6,06H 。8 字節(jié) MOV R5,08H 。密碼輸入錯誤的提示 XSD:PUSH ACC PUSH PSW MOV SBUF, 98H JNB TI, $ CLR TI MOV SBUF, 79H JNB TI, $ CLR TI MOV SBUF, 11H JNB TI, $ CLR TI MOV SBUF, 79H JNB TI, $ CLR TI MOV SBUF, 79H 17 JNB TI, $ CLR TI MOV SBUF, 38H JNB TI, $ CLR TI POP PSW POP ACC RET 。送已經(jīng)輸入密碼的次數(shù) JNB TI, $ CLR TI MOV SBUF, 0FEH 。功能 :分五屏幕顯示數(shù)據(jù),分別是 XSA,XSB,XSC,XSD,。 。報警的次數(shù) TIMERS EQU 6BH 。 14 開 始 初始化 有鍵按下? 調(diào)用顯示 啟動定時 識別按鍵 全部按完? 超時? 比較密碼 開鎖 結(jié)束 自動清除 3 次? 鎖定 N N Y Y Y N Y N 按下 F2 啟動定時 輸入密碼 存入緩沖 再輸入一次 比較密碼 調(diào)用 24C02 調(diào)用顯示 按 F2 退出 Y 重新輸入 N 圖 4- 1 主程序流程圖 圖 4- 2 修改密碼流程圖 Y N 15 附錄:主程序 。 調(diào)電存儲服務(wù)程序 當比較密碼的時候,需要讀 AT24C02 程序,將存儲在芯片內(nèi)的數(shù)據(jù)讀到 RAM 中,然后和輸入的密碼相比較。由 R4, R5, T1 構(gòu)成電壓檢測電路,蓄電池電壓低,則 T1,T2 導(dǎo)通,實現(xiàn)對其充電;充滿后, T1, T2 截止,停止充電,同時 D1 熄滅,電路中 C4的作用是濾除干擾信號。電源電路圖如圖 3- 9所示。 AT24C02 是ATMEL 公司的 2KB 字節(jié)的電可擦除存儲芯片, 采用兩線串行的總線和單片機通訊,電壓最低可以到 ,額定電流為 1mA,靜態(tài)電流 10Ua(),芯片內(nèi)的資料可以在斷電的情況下保存 40 年以上,而且采用 8 腳的 DIP 封裝,使用方便。移位寄存器 74HC164 還兼作數(shù)碼管的驅(qū)動,插頭 1( header1)接電源,插頭 2( header2)接數(shù)據(jù)和脈沖輸出端 ??紤]到為了節(jié)約單片機的口資源,本系統(tǒng)的顯示采用串行顯示的方式,只使用單片機的一個串行 口,就可以完成單片機的顯示功能,顯示電路的電路原理圖如圖 3- 6 所示。 L2 開門指示燈,當用戶在規(guī)定的時間內(nèi)正確的輸入了密碼,此燈轉(zhuǎn)變?yōu)榫G色,表示開門,否則不顯示。 F2CLR 0 1 EN 5 9 F4 4 8 F3 3 7 F2 2 6 F1 L1 L2 L3 8 是用來進入修改密碼的狀態(tài)。 圖 3- 5 按鍵操作面板示意圖 10 個數(shù)字鍵用來輸入密碼, 另外 6 個功能鍵分別是: CLR、 EN、 F F F F4。方法是:依次給列線送低電平,然后查所有行線狀態(tài),如果全為 1,則所按下的鍵不在此列;如果不全為 1,則所按下的鍵必在此列,而且是在與零電平行線相交的交點上的那個鍵。 首先辨別鍵盤中有無鍵按下,有單片機 I/O 口向鍵盤送全掃描字,然后讀入行線狀態(tài)來判斷。 在這種行列式矩陣鍵盤非鍵盤編碼的單片機系統(tǒng)中,鍵盤處理程序首先執(zhí)行等待按鍵并確認有無按鍵按下的程序段。在行線和列線的每一個交叉點上,設(shè)置一個按鍵。其中 D C24 是為了消除電磁鎖可能產(chǎn)生的反向高電壓以及可能產(chǎn)生的電磁干擾。其實際電路如圖 3- 2 所示。 4 圖 2- 2 單片機控制方案 通過比較以上兩種方案,單片機方案有較大的活動空間,不但能實現(xiàn)所要求的功能而且能在很大的程度上擴展功能,而且還可以方便的對系統(tǒng)進行升級,所以我們采用后一種方 案。 密碼鎖電路包含:鍵盤輸入、密碼修改、密碼檢測、開鎖電路、執(zhí)行電路、報警電路、鍵盤輸入次數(shù)鎖定電路。其原理方框圖如圖 2- 1 所示。 ( 4) 有效按鍵提示。修改密碼之前必須再次輸入密碼,在輸入新密碼時候需要二次確認,以防止誤操作。 在安全技術(shù)防范領(lǐng)域,具有防盜報警功能的電子 密碼鎖逐漸代替?zhèn)鹘y(tǒng)的機械式密碼鎖,克服了機械式密碼鎖密碼量少、安全性能差的缺點,使密