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畢業(yè)設(shè)計(jì)-基于at89c51單片機(jī)的秒表設(shè)計(jì)(更新版)

  

【正文】 gain stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 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 about how he felt and I would like to speak to him first to find out what his experience was.Uefa hasa damagesbased agreement, you should make sure you39。t } else { if(f_k5==0) { f_k5=1。 } else return 0。 return 0。 if(key2==0) { f_k2=0。}char scan_key1(void){ if(key1==0) { delay(100)。bit f_k2=1。 if(c==1)Display_FiveNum(0xba,0x80,save1_m,save1_s)。 m=0。 flag=1。 ClearScreen(2)。 TH0=(6553616600)/256。s=save1_s。} if(m==60)m=0。 //m display_HZ(0xbc,0x40,HZ[4])。 //價(jià) display_FH(0xb8,0x60,FH[0])。extern scan_key5()。bit flag=0。這次課程設(shè)計(jì)使我受益匪淺,而且都是實(shí)際的東西。如:AJMP指令跳轉(zhuǎn)不回指定的地位,是由于跳轉(zhuǎn)的長(zhǎng)度大于AJMP跳轉(zhuǎn)的長(zhǎng)度,最后只有用LJMP跳轉(zhuǎn)后跳到指定的位置。低功耗的閑置和掉電模式數(shù)據(jù)保留時(shí)間:10年   由于將多功能8位CPU和閃爍存儲(chǔ)器組合在單個(gè)芯片中,ATMEL的AT89C51是一種高效微控制器,AT89C2051是它的一種精簡(jiǎn)版本。 二、 系統(tǒng)總體方案選擇與說(shuō)明此次課程設(shè)計(jì)題目是秒表,由于此次課程設(shè)計(jì)要求是秒表,則在定時(shí)時(shí)要求比較精確,所以采用硬件的定時(shí)器定時(shí)時(shí)比較準(zhǔn)確的;由于秒表的定時(shí)程序是很小的,在利用軟件定時(shí)占用的CPU并不是很多,不能顯現(xiàn)出來(lái),但真正大程序時(shí)會(huì)很占用資源的,所以在用定時(shí)中斷過(guò)程中是非常節(jié)省資源的由課程設(shè)計(jì)的要求和任務(wù),我采用的C語(yǔ)言編程,設(shè)計(jì)秒表要求一秒定時(shí),采用了定時(shí)器,即用單片機(jī)內(nèi)部的定時(shí)器T0。通過(guò)液晶顯示器顯示秒十位、個(gè)位、小數(shù)點(diǎn)后一位和兩位,在設(shè)計(jì)過(guò)程中用一個(gè)存儲(chǔ)單元作為秒計(jì)數(shù)單元,當(dāng)一秒鐘到來(lái)時(shí),就讓秒計(jì)數(shù)單元加1,重新開(kāi)始秒計(jì)數(shù)。其中數(shù)碼管的顯示時(shí),我在程序中首先定義了一個(gè)關(guān)于數(shù)碼管顯示的字形碼定義,以便在顯示時(shí)調(diào)用即可。1288位內(nèi)部RAM   : 顯示部分,7分別和顯示器的D0到D7相對(duì)應(yīng)連接;、CSRW和RS相對(duì)應(yīng)連接;。:心得體會(huì)通過(guò)這次課程設(shè)計(jì)——秒表計(jì)時(shí)器,使我又重新開(kāi)始學(xué)習(xí)C語(yǔ)言,因?yàn)镃語(yǔ)言是大一學(xué)的,至從學(xué)完就再也沒(méi)用過(guò),所以開(kāi)始很陌生,我又找了有關(guān)資料來(lái)了解,才有了一點(diǎn)眉目。char save1_m,save1_s,save2_m,save2_s,save3_m,save3_s,save4_m,save4_s。uc m=0,s=0。i0。 //里:一個(gè)漢字占2行 行+2 display_HZ(0xba,0x50,HZ[3])。 //: // Display_FiveNum(0xbc,0xA8,zj)。} else if(i==2) {save2_m=m。} else if(i==3) {m=save3_m。 ET0=1。 while(1) //鍵盤掃描程序 { led=~led。 if(c==4)c=50。 } }}void timer0(void) interrupt 1{ TH0=(6553616600)/256。 TR0=1。sbit key4=P1^3。 } else return 0。 } else { if(f_k2==0) { f_k2=1。 return 1。 } else return 0。 }}g an employment tribunal claiEmployment tribunals sort out disagreements between employers and employees.You may need to make a claim to an employment tribunal if: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 organisations listed undernearest CAB.For more information about making a claim to an employment tribunal, seeCity39。二十年的人生軌跡深深淺淺,突然就感覺(jué)到有些事情,非做不可了。A person39。 From the corner at the beginning of deep friends
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