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基于at89c51單片機(jī)的多路數(shù)字電壓表(留存版)

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【正文】 about happened. If your application is received after this time limit, the tribunal will not usually accept it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻,天空是陰暗的,空氣里有著剛下過雨之后的清新因子。 At the moment, the sky is dark, the air is fresh factor after just rained. Suddenly thought of blue plaid shirt?;蛟S是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個不同的日子過成了同一天的樣子;或許是追溯過去,對自己那些近乎偏執(zhí)的怪異信念的醒悟,這些天以來,思緒一直很凌亂,在腦海中不斷 糾纏。i4。:39。 wc51ddr(39。 wc51ddr(39。y++) {。 _nop_()。 RW=0。 RW=1。 程序附錄 include include include define uchar unsigned char define uint unsigned int sbit RS=P1^7。 可以用來測量電壓、電流、電阻,而且還可以進(jìn)行功能的擴(kuò)展。首先對定時 /計數(shù)器和 LCD 進(jìn)行初始化,在 LCD上顯示信息,然后進(jìn)行循環(huán),在循環(huán)中以此位:調(diào)用 A/D 轉(zhuǎn)換子程序?qū)?4個通道轉(zhuǎn)換一次,判斷 K1 鍵是否按下,當(dāng)按下則當(dāng)前通道地址加 1,當(dāng)前通道值轉(zhuǎn)換成電壓值,顯示當(dāng)前通道值。 VEE: 為液晶顯示器對比度調(diào)整端,接正電源時對比度最弱,接地時對比度最高,對比度過高時會產(chǎn)生“鬼影”,使用時可以通過一個 10K的電位器調(diào)整對比度。該信號可作為被 CPU 查詢的 狀態(tài)信號,也可作為對 CPU 的中斷請求信號。輸出鎖存器用于存放和輸出轉(zhuǎn)換得到的數(shù)字量。 P3口的地址為 B0H,位地址為 BOH~ B7H。 P0 口的邏輯電路主要由 D 觸發(fā)器構(gòu)成的鎖存器, FET(場效應(yīng)管 )構(gòu)成的輸出驅(qū)動電路,用于引腳數(shù)據(jù)輸入緩沖的緩沖器,一個多路轉(zhuǎn)接開關(guān)( MUX)構(gòu)成??傮w結(jié)構(gòu)如圖 1 所示,先用 A/D 轉(zhuǎn)換器對各路電壓值進(jìn)行采樣,得到相應(yīng)的數(shù)字量,再按數(shù)字量與模擬量成正比關(guān)系運(yùn)算得到對應(yīng)的模擬電壓值,然后通過單片機(jī)進(jìn)行數(shù)據(jù)處理,最后通過顯示器顯示出被測電壓值,另外可以通過按鍵選擇通道。隨著單片機(jī)技術(shù)的飛速發(fā)展,各種單片機(jī)蜂擁而至,單片機(jī)技術(shù)已成為一個國家現(xiàn)代化科技水平的重要標(biāo)志。 economic the current economic level of our country,electronical measuring instruments developed by SCM have high accuracy as well as high cost performance,not only can be used to measure Voltage、 Current and Resistance,but also be widely used in measuring temperature、 humidity or some other Measurement situations. This topic design of multichannel digital voltage meter has the advantages of stable performance, easy to carry, shows the clear and intuitive, accurate readings, greatly reducing the measurement error events caused by human factors, greatly improves the precision of measurement. Key words: Digital Voltage。此 .hex 文件是硬件電路運(yùn)行實(shí)現(xiàn)的源代碼來源。這些部件通過內(nèi)部總線連接起來,構(gòu)成了一個完整的微型計算機(jī)。但多路轉(zhuǎn)接開關(guān)的一個輸入端不再是地址 /數(shù)據(jù),而是單一的地址,因?yàn)樵跇?gòu)造系統(tǒng)總線時,P2口只能作為高位地址而不能作為數(shù)據(jù)線使用。 ADC0808 是 8位逐次逼近式,可實(shí)現(xiàn) 8路模擬信號的分時采用,片內(nèi)有 8 路模擬選通開關(guān),以及相應(yīng)的選通地址鎖存與譯碼電路。如正在進(jìn)行轉(zhuǎn)換時又接到新的啟動脈沖,則原來的轉(zhuǎn)換進(jìn)程被中止,重新從頭開始轉(zhuǎn)換。因此,最好利用 EOC 上升沿產(chǎn)生中斷請求,而不是靠高電平產(chǎn)生中斷請求。但是匯編語言在學(xué)習(xí)單片機(jī)的過程中卻是一條捷徑,想要真正懂得單片機(jī)的內(nèi)部奧妙,就必須認(rèn)真學(xué)習(xí)匯編語言。 6. 結(jié)論 經(jīng)過本次為期數(shù)月的畢業(yè)課題設(shè)計,使我真正有 機(jī)會對大學(xué)期間所學(xué)的專業(yè)知識進(jìn)行了系統(tǒng)的分析總結(jié),從課題的分析設(shè)計到最后的硬件電路設(shè)計和軟件編程設(shè)計的實(shí)現(xiàn),都是在老師的指導(dǎo)下,逐漸完成的。沒有他 們 的幫助 , 對于我來說要想在短短的幾個月的時間里完成畢業(yè)論文幾乎是不可能的事情。 uint temp。 } void wc51ddr(uchar j) { fbusy()。 _nop_()。ji。 wc51ddr(39。:39。E39。 wc51ddr(chnumber+0x30)。s actions. CSKA said they were surprised and disappointed by Toure39。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。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 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 基于單片機(jī)的多路數(shù)字電壓表設(shè)計 has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。s antiracism taskforce, is in London for the Football Association39。 temp=(temp*100)/51。L39。D39。 ET0=1。 while (EOC==0)。 wc51r(0x06)。 EN=0。 sbit key1=P1^0。在論文的寫作過程中, 她 給了我許許多多的幫助和關(guān)懷。 圖 13 輸入電壓為 時, LCD顯示結(jié)果 入電壓值為 時,顯示結(jié)果如圖 14 所示,測量誤差為 +。 圖 8 按鍵處理電路圖 咸陽師范 學(xué)院 2021屆本科畢業(yè)畢業(yè)論文(設(shè)計) 5 4 軟件設(shè)計 C 語言與匯編語言 匯編語言和 C 語言各有特點(diǎn)。 START 的上升沿將逐次逼近寄存器 SAR 復(fù)位,在該上升沿之后的 2μ s加 8 個時鐘周期內(nèi)(不定 ), EOC信號將變低電平,以指示轉(zhuǎn)換操作正在進(jìn)行中,直到轉(zhuǎn)換結(jié)束后 EOC才變成高電平。 地 址 選中通道 ADDC ADDB ADDA 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7 圖 5 地址信號與選中通道的關(guān)系 基于單片機(jī)的多路數(shù)字電壓表設(shè)計 ( 4) VR(+)、 VR():正、負(fù)參考電壓輸入端,用于提供片內(nèi) DAC電阻網(wǎng)絡(luò)的基準(zhǔn)電壓。 /EA(訪問程序存儲器控制信號 ):當(dāng) EA 信號為低電平時,對 ROM的讀操作是針對外部程序存儲器的;當(dāng) EA 信號為高電平時,對 ROM 的操作是從內(nèi)部程序存儲器開始,并可延續(xù)至外
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