【正文】 ，輸入 /輸出時(shí)鐘以及地址輸入端。在本設(shè)計(jì)中，我們的目標(biāo)是設(shè)計(jì)高精度的電壓表，因此在此，我們選擇精 11 度為 12位的 TLC2543 芯片。 15 ~CS I 片選端。 1． AIN0AIN10這 11個(gè)模擬信號(hào)輸入由內(nèi)部多路選器選擇。串行數(shù)據(jù)以 MSB 為前導(dǎo)并在 I/O clk 的前 4個(gè)上升沿被移入。 5． EOC 在最后的 I/O clk 下降沿之后，從高電平變?yōu)榈碗娖讲⒈３值椭钡睫D(zhuǎn)換完成及數(shù)據(jù)準(zhǔn)備傳輸。第三，它將前一次轉(zhuǎn)換的數(shù)據(jù)的其余 11 位移出 data out 端。 9． REF端通常接地。最高精度為。使用的基本元器件是： AT89C51 單片機(jī)， TLC2543 模數(shù)轉(zhuǎn)換芯片， 1602 液晶顯示器，開(kāi)關(guān)，按鍵，電容，電阻，晶振，標(biāo)準(zhǔn)電源等等。 R1電阻為 1K。被測(cè)電壓輸入端、整理過(guò)的模擬電壓輸入端，開(kāi)關(guān)與單片機(jī)的連接如圖所示。具體如下圖所示。 該鍵盤(pán)的功能：當(dāng)鍵盤(pán)被按下時(shí)，即可計(jì)算后 5秒的平均電壓值。執(zhí)行速度快。用 C語(yǔ)言來(lái)控制單片機(jī)無(wú)疑是一個(gè)理想的選擇。 編寫(xiě)驅(qū)動(dòng) 1602液晶顯示模塊程 序。//1602 液晶寫(xiě)命令 /數(shù)據(jù)標(biāo)志 ,0時(shí)寫(xiě)命令 sbit rw=P1^1。 sbit cs=P1^5。//定義電壓表檔位相關(guān)標(biāo)志 sbit flag_2=P2^2。 //顯示的單位及有關(guān)的字符 uchar code tab1[]=MV。 void delay(int z)//延時(shí)函數(shù) { int x,y。y0。 delay(5)。 } void write_dat(uchar dat)//往 1602液晶寫(xiě)數(shù)據(jù)函數(shù) { rs=1。 delay(5)。 22 write_(0x38)。 write_(0x06)。 } void init_timer0()//定時(shí)計(jì)數(shù)器 0初值化函數(shù)， { TMOD=0x01。//打開(kāi)中斷 TR0=0。break。 write_(add)。 dat=dat/10。 write_dat(39。 write_dat(a[0]+0x30)。 case 1:add=0x80+0x40。 while(*str!=39。 } } uint read_AD(uchar con_way)//讀取 AD轉(zhuǎn)換值操作函數(shù) { uint dat=0。 con_way=4。/*選 擇 0 通道，在輸入該控制數(shù)據(jù)的同時(shí)輸出前一次 AD轉(zhuǎn)結(jié)果 */ input=CY。 clk=1。 return dat。//把讀取得的 AD轉(zhuǎn)換值給變量 dq if(!flag_3) dat_v=(200*dq)/4096*100。 } void read_key()//鍵盤(pán)掃描函數(shù) { static uchar key_state=0。 display_zifu(1,0,tab3)。 case key_state2: 27 if(key) key_state=key_state0。//定義 5 個(gè)隨機(jī)電壓值變量 uchar flag。 while(1) { dat=read_value()。 } 28 else { display_zifu(0,1,tab2)。 //當(dāng)鍵盤(pán)按下時(shí)，計(jì)算后五秒的平均電壓值 if(t==20) { t=0。 if(flag==3) dat3=dat。 display(1,7,dat_aver)。 write_(0x01)。 t++。 1） 檢查所設(shè)計(jì)的硬件電路板所有的器件和引腳是否正確，尤其是電源的連接是否正確；檢查各總線(xiàn)是否有短路的故障。軟件調(diào)試是一個(gè)模塊一個(gè)模塊進(jìn)行的。 1） 檢查液晶顯示模塊程序。本設(shè)計(jì)的按鍵模塊程 序是用狀態(tài)機(jī)的方法，可以在 key_state1 狀態(tài)下加一個(gè)任務(wù)，如顯示一個(gè)字符在液晶上。 4） 檢查數(shù)據(jù)的轉(zhuǎn)換模塊程序。 5） 總調(diào)試。如果一樣，說(shuō)明設(shè)計(jì)成功完成。因此本設(shè)計(jì)為之增加了可測(cè) 5秒內(nèi)平均電壓的電壓值。通過(guò)此設(shè)計(jì)可知在單片機(jī)系統(tǒng)開(kāi)發(fā)過(guò)程應(yīng)注意以下事項(xiàng)。往往高性能器件的價(jià)格也是較高的。 單片機(jī)的應(yīng)用如今已經(jīng)是在工業(yè)，電子等方面展示出了它的優(yōu)越性，利用單片機(jī)在設(shè)計(jì)電路 逐漸成了趨勢(shì)，它與外圍電路再加上軟件程序就可以構(gòu)建任意的產(chǎn)品，使得本設(shè)計(jì)成為現(xiàn)實(shí)。數(shù)字電壓表。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 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 actions. 33 CSKA said they were surprised and disappointed by Toure39?？傆X(jué)得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫(xiě)點(diǎn)什么。t really grow up, it seems is not so important。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來(lái)，這個(gè)世界上，對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)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(chǎng)還沒(méi)有開(kāi)始就宣告了終結(jié)的邂逅計(jì)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。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 。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 35 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(shuō)，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？ 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(kāi)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 t