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畢業(yè)設(shè)計(jì)-基于at89c51單片機(jī)的自動報(bào)時(shí)系統(tǒng)設(shè)計(jì)-wenkub.com

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【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. 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 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? 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 31 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。 不積跬步何以至千里,本設(shè)計(jì)能夠順利的完成,也歸功于各位任課老師的認(rèn)真負(fù)責(zé),使我 能夠很好的掌握和運(yùn)用專業(yè)知識,并在設(shè)計(jì)中得以體現(xiàn)。對孫老師的感激之情是無法用言語表達(dá)的。 從這次的畢業(yè)設(shè)計(jì)中,我真真正正的意識到,在以后的學(xué)習(xí)中,要理論聯(lián)系實(shí)際,把我們所學(xué)的理論知識用到實(shí)際當(dāng)中,學(xué)習(xí)單機(jī)片機(jī)更是如此,程序只有在經(jīng)常的寫與讀的過程中才能提高。如圖 示: 圖 在彈出的對話框中選 擇 AT89C51這個(gè)芯片,確定。最后點(diǎn)擊“好”,完成仿真器的設(shè)置。聯(lián)調(diào)需要注意的是,各程序模塊間能否正確傳遞參數(shù),特別要注意各子程序的現(xiàn)場保護(hù)與恢復(fù)。 定時(shí)器程序: T0TIMER: NOP PUSH ACC PUSH PSW SETB RS0 DJNZ DISCOUNT, T0TIMER1 MOV DIS COUNT , 6 MOV DUANADDR, 30H MOV WEI MA, 00100000B T0TIMER1: NOP MOV R0, DUANADDR MOV P2, 0 MOV A, R0 MOV DPTR,TAB MOVC A,A+DPTR MOV P0,A MOV P2,WEIMA INC R0 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 22 MOV A,WEIMA RR A MOV WEIMA,A MOV TH0,0F8H MOV TL1,30H POP PSW POP ACC 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 23 4 系 統(tǒng) 調(diào) 試 完成了硬件的設(shè)計(jì)、制作和軟件編程之后,要使系統(tǒng)能夠按設(shè)計(jì)意圖正常運(yùn)行,必須進(jìn)行系統(tǒng)調(diào)試。調(diào)用延時(shí)程序 、 定時(shí)器程序模塊 為定時(shí)器 T0 中斷服務(wù)子程序,主要是完成循環(huán)顯示。調(diào)用 KS 判斷有鍵按下嗎 JNZ K1 。流程圖如下: 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 16 開始主程序初始化對 讀時(shí)間顯示緩沖區(qū)按鍵掃描 圖 主程序流程圖 LCALL KEYSET LCALL ALM SET LCALL ALM MOV ADDR1302, 85H LCALL READCLOCK MOV A, DATA1302 ANL A, 10H MOV 36H, A MOV A, DATA1302 ANL A, 0FH MOV 37H, A MOV ADDR1302, 83H LCALL READCLOCK MOV A, DATA1302 ANL A, 0F0H MOV 38H, A MOV A, DATA1302 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 17 ANL A, 0FH MOV 39H, A MOV ADDR1302, 81H LCALL READCLOCK MOV A, DATA1302 ANL A, 70H MOV 3AH, A MOV A, DATA1302 ANL A, OFH MOV 3BH, A MOV R4, 6 顯示程序采用動態(tài)顯示,由位碼控制那一個(gè)數(shù)碼管顯示,由段碼控 制數(shù)碼管顯示什么數(shù)值,根據(jù)中斷程序顯示時(shí)間來查表顯示數(shù)值,從第一位到第六位逐個(gè)點(diǎn)亮,同時(shí)每顯示一位判斷一次 六位顯示完 了嗎?沒有顯示完進(jìn)行顯示下一位,顯示完了從頭開始再循環(huán)。 b)時(shí)間緩沖區(qū):使用( 36H— 3BH) 6個(gè) RAM來保存當(dāng)前從 DS1302中讀出來的時(shí)間,在主程序運(yùn)行時(shí)大約每一秒鐘把其中的數(shù)據(jù)更新到顯示緩沖區(qū)用以顯示。 2. 要有主程序程序。對于程序我們的設(shè)計(jì)思路是: 1.在此設(shè)計(jì)中用定時(shí)器來完成動態(tài)掃描顯示。 DS1302 實(shí)時(shí)時(shí)鐘芯片接口由 、 、 P3口接鬧鐘小喇叭。當(dāng)以多字節(jié)方式寫時(shí)鐘寄存器時(shí),必須按數(shù)據(jù)的次序?qū)懽钕鹊?8個(gè)寄存器。 數(shù)據(jù)輸入:當(dāng)命令字節(jié)為寫命令時(shí),最低位為 0,在下 8個(gè) SCLK 周期的上升沿輸入字節(jié),數(shù)據(jù)從最低位開始輸入;數(shù)據(jù)輸出:當(dāng)命令字節(jié)為讀命令時(shí),最低位為1,在下 8個(gè) SCLK周期的下降沿輸出數(shù)據(jù)字節(jié)。 引腳號 引腳名稱 功能 1 Vcc2 主電源 3 X X2 4 GND 地 5 RST 復(fù)位兼片選端 6 I/O 串行數(shù)據(jù)輸入 /輸出 7 SCLK 串行時(shí)鐘輸入端 8 Vcc1 后備電源 濟(jì)源職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì) 13 操作方式:芯片的操 作受地址 /命令字節(jié)控制,每一組數(shù)據(jù)的傳送由命令字節(jié)初始化。時(shí)鐘 SCLK是上升沿后繼以下降沿的序列。 它的引腳圖和引腳功能 DS1302的引腳結(jié)構(gòu)見圖 ,引腳功見表 。 帶慢速充電控制備份電源的充電特性。 當(dāng) G=1時(shí), A不論輸入高電平還是低電平 Y為高阻狀態(tài)。同時(shí)采用動態(tài)掃描方式依次循環(huán)點(diǎn)亮數(shù)碼管,即構(gòu)成多位動態(tài)顯示電路。依此規(guī)律循環(huán),即可使各位數(shù)碼管顯示將要顯示的字符。采用靜態(tài)顯示方式的優(yōu)點(diǎn):較小的電流即可獲得較高的亮度,且占用 CPU時(shí)間少,編程簡單,顯示便于監(jiān)測和控制,但其占用的接口線多,硬件電路復(fù)雜,成本高,只適合于顯示位數(shù)較少的場合。 3. 數(shù)碼管字形編碼 要使數(shù)碼管顯示出相應(yīng)的數(shù)字或字符,必須使段數(shù)據(jù)口輸出相應(yīng)的字形編碼。當(dāng)某段驅(qū)動電路的輸出端為高電平時(shí),則該端所連接的字段導(dǎo)通并點(diǎn)亮。數(shù)碼管的外 形結(jié)構(gòu)如圖 ( a)所示。為了保證 CPU 對鍵的一次閉合僅在按鍵穩(wěn)定時(shí)作一次鍵輸入處理,必須消除產(chǎn)生的前沿(后沿)抖動影響。定時(shí)時(shí)間到,蜂鳴器鳴叫 1min后自動停鬧,每次設(shè)置時(shí)只能定一次,下次需重新設(shè) 置。按鍵的接口由 、 、 、 、 。上拉電阻保證了按鍵斷開時(shí), I/O接口線有確定的高電平。如圖 ,每個(gè)獨(dú)立按鍵單獨(dú)占有一根 I/O接口線,每根 I/O接口線的工作狀態(tài)不會影響到其他 I/O接口線。 圖 (b)是我設(shè)計(jì)中用到的復(fù)位單路, 為按鍵復(fù)位電路。 單片機(jī)復(fù)位的條件是:必須使 RST/Vpd或 RST引腳加上持續(xù)兩個(gè)機(jī)器周期 (即 24個(gè)振蕩周期 )的高電平。但是,由于不同的 單片 機(jī) 的 硬件電路和器件不完全相同,所以其需要的時(shí)鐘頻率范圍也不相同。 在一個(gè)時(shí)鐘周期內(nèi), CPU僅完成一個(gè)最基本的動作。 AT89C51 LE
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