【正文】 件，利用 Proteus 軟件繪制出硬件的原理，并仔細地檢查修改，直至形成完善的硬件原理圖。 淮安信息職業(yè)技術(shù)學(xué)院畢業(yè)論文 20 第八章 軟件設(shè)計 匯編流程圖 開始 系統(tǒng)初始化 啟動 A/D 轉(zhuǎn)換 采集 A/D 轉(zhuǎn)換值 數(shù)據(jù)轉(zhuǎn)換 Y 調(diào)用顯示 三位是否顯示完？完？ 讀電壓值 Y N END 程序流程圖 轉(zhuǎn)換結(jié)束？ Y N 第八章 軟件設(shè)計 21 匯編程序 。存放三個數(shù)碼管的段碼 ADC EQU 35H。定義 ADC0809 的功能控制引腳 ORG 0000H LJMP MAIN。主程序，各寄存器初始化， ADC0809 采集數(shù)據(jù)和調(diào)用顯示主程序； MAIN: MOV LED1,00H MOV LED2,00H MOV LED3,00H。選擇 ADC0809 的通道 2 WAIT: CLR ST SETB ST CLR ST。等待轉(zhuǎn)換結(jié)束 SETB OE。暫存 A/D 轉(zhuǎn)換結(jié)果 CLR OE。將轉(zhuǎn)換結(jié)果放入 A 中，準(zhǔn)備個 位數(shù)據(jù)轉(zhuǎn)換 MOV B,50。將變換后的個位值送顯示緩沖區(qū) LED1 MOV A,B。變換十分位調(diào)整值 5 送 B DIV AB 淮安信息職業(yè)技術(shù)學(xué)院畢業(yè)論文 22 MOV LED2,A。最后的余數(shù)作百分位值送 LED3 LCALL DISP。顯示子程序： DISP: MOV R1,LED1 CJNE R1,5,GO。是 5V，即最高值，將小數(shù)的十分位清零 MOV LED3,0H。顯示位數(shù)賦初值，用到 3 位數(shù)碼管 MOV R3,0FDH。關(guān)閉顯示 ,目的防止亂碼 MOV A,R1。送表首地址給 DPTR MOVC A,A+DPTR。判斷是否個位數(shù)碼管？否則跳到 GO1 ORL A,80H。送段碼給 P0 口 MOV A,R3 MOV P2,A。調(diào)用延時 MOV R3,A RL A。改變段碼 DJNZ R2,DISP1。延時 5S 程序： DELAY : MOV R6,10 D1: MOV R7,250 DJNZ R7,$ DJNZ R6,D1 RET 第八章 軟件設(shè)計 23 。共陰極數(shù)碼管顯示 04 DB 6DH,7DH,07H,7FH,6FH。要將 A/D 轉(zhuǎn)換來的數(shù)據(jù)變換成對應(yīng)的 BCD 碼，這是因為 ADC0809 是 8 位 A/D轉(zhuǎn)換，對 0～ 5V的模擬量轉(zhuǎn)換成 00H～ FFH 的數(shù)字量，即 0～ 255。最高 255/50=（≈ 5V）， BCD 碼取 0101B，只精確到十分位。 總結(jié) 24 總 結(jié) 在 A/D 轉(zhuǎn)換部分軟件的設(shè)計中，首先要考慮到 A、 B、 C 分別接地址鎖存器提供的低三位地址，只要把三位地址寫入 ADC0809 中的地址鎖存器，就實現(xiàn)了模擬通道選擇 IN0。 單片機為 8 位處理器，當(dāng)輸入電壓為 時，輸出數(shù)據(jù)值為 255（ FFH） ，決定了該電壓表的最大分辨率（精度）只能達到 。在 200MV檔中，電壓值的變化是由 0200MV變化，而模擬開關(guān)的變化為 05V 變化，所以在此檔位中電壓表的絕對精度是（ 200/255）；在 2V 檔中，電壓值的變化是由 2002021MV 變化，模擬開關(guān)的變化為 05V 變化，所以在此檔位中電壓表的絕對精度是 （ 1800/255）；在 20V 檔中，電壓值的變化是由 22MV 變化，模擬開關(guān)的變化也為 05V 變化，所以在此檔位中電壓表的 絕對精度是 （ 18/255）。 基于本設(shè)計中的電路，還可以擴展很多其它方面的功能如： 1）本次設(shè)計在采集模擬電壓量時只用到了 ADC0809 的 IN0 通道，完全可以通過編程 實現(xiàn)多通道輸入，并在 LCD 液晶顯示屏 上顯示相對應(yīng)的通道值。 3) 可以利用單片機串口通信將電壓值傳送至電腦進行同步顯示和后期處理。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。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s antiracism taskforce, is in London for the Football Association39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s 21 win. Michel Platini, president of European football39。s actions. CSKA said they were surprised and disappointed by Toure39。 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?？傆X得自己自己似乎應(yīng)該去做點什么，或者寫點什么。 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。t really grow up, it seems is not so important。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。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來，這個世界上，對某個事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅決，還有，時間。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。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時候是最后又打起了退堂鼓。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。 Those were broken into various shapes of stationery。 Have declared the end of the encounter that haven39。突然想到那件藍格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告了終結(jié)的邂逅計劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。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。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there