【正文】 m nothing if not that! In his text he expounds on the idea that one must give their life a purpose. And that is the true topic of this entry. These last four years have been so easy: teach for a grand total of six hours a week, and the rest of my time is mine. Since I39。s cultural foray overseas, has been widely panned by its home audience. Retitled Empresses in the Palace, the American version has been shortened from its original 76 episodes at 45 minutes each, to six 90minute episodes. The quick pacing threw off many native viewers, who are accustomed to a more leisurely daytimesoapstyle narrative rhythm. (Chinese TV stations would run two or three episodes every day.) I did not finish the fulllength version and found the truncated one not difficult to follow. What39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。在此，特別感謝老師以及各位同學(xué)在我畢業(yè)設(shè)計(jì)中所做出的指導(dǎo)和幫助。break。 TL0 = 0xE5。 flag|=1。 case 0xFB:state=3。 TL0 = 0xE5。i++) { P0=tab2[8i]。i++) //向上逐個(gè)熄滅 { P2=tab2[8i]。i9。 for(i=0。 for(i=0。 } } for(i=0。 return。 return。 return。i++) { P0=0xAA。i++) { P0=tab4[i]。 delay(10000)。 delay(10000)。 delay(10000)。 delay(10000)。 delay(30000)。 uchar stateTemp=0。程序設(shè)計(jì)流程如圖 32。 第三章 軟件設(shè)計(jì) 11 單片機(jī)的應(yīng)用系統(tǒng)由硬件和軟件組成 ，上述硬件各電路搭建完成后， 我們還不能看到多控制、多閃爍方式的 LED 燈系統(tǒng)循環(huán)點(diǎn)亮的現(xiàn)象，我們還需要告訴單片機(jī)怎么樣進(jìn)行控制，即編寫程序控制單片機(jī)管腳電平的高低變化，來實(shí)現(xiàn)發(fā)光二極管的 閃爍 。 PSEN：外部程序存儲(chǔ)器的選通信號(hào)。 ALE/PROG：當(dāng)訪問 外部存儲(chǔ)器時(shí)，地址鎖存允許的輸出電平用于鎖存地址的地位字節(jié)。本系統(tǒng)中語(yǔ)音芯片 ISD1420 的地址端接 P2口。 P1 口管腳寫入 1后，被內(nèi)部上拉為高，可用作輸入， P1口被外部下拉為低電平時(shí)，將輸出電流，這是由于內(nèi)部上拉的緣故。（如圖 24） 8 圖 24 led顯示電路圖 9 AT89C51 管腳圖如 下 圖 25 所示 圖 25 AT89C51 引腳 排列 VCC：供電電壓 +5V。 如圖 23 中斷控制電路圖 LED 顯示電路 key1 key2 key3 key4 7 流水燈采用的是發(fā)光二極管（ LightEmitting Diode），簡(jiǎn)稱 LED，是一 種將電能轉(zhuǎn)換為光能的半導(dǎo)體器件，具有體積小、耗電低的優(yōu)點(diǎn)，常被用作微型計(jì)算機(jī)與數(shù)字電路的輸出裝置。 AT89C51 單片機(jī)芯片內(nèi)部有一個(gè)反向放大器構(gòu)成的振蕩器，XTAL1 和 XTAL2 分別為振蕩器電路的輸入端和輸出端，時(shí)鐘可由內(nèi)部和外部生成，在XTAL1 和 XTAL2 引腳上外接定時(shí)元件，內(nèi)部振蕩電路就會(huì)產(chǎn)生自激振蕩。本課題設(shè)計(jì)的 總體框圖如下圖 12所示 圖 12 系統(tǒng)總體設(shè)計(jì)框圖 系統(tǒng)設(shè)計(jì)如下： 此設(shè)計(jì)方案中單片機(jī)的 P1 口接 4路按鍵控制電路，實(shí)現(xiàn)彩燈閃爍方式的切換功能；單片機(jī)的 引腳接上一個(gè)按鍵開關(guān)以實(shí)現(xiàn)對(duì)彩燈中斷的控制；單片機(jī)上的 P0 和 P2口接 16 路 LED發(fā)光二極管組成彩燈顯示電路，實(shí)現(xiàn)多種形式的閃爍功能。 該控制電路能完成多種閃燈模式以及隨意變換想要的閃爍方式和控制彩燈的閃爍頻率等功能。在設(shè)計(jì)制作時(shí)，既要給人帶來變換的吸引力，又要顯得主次分明，沒有色彩和圖案凌亂的感覺。本設(shè)計(jì)采用上電自動(dòng)復(fù)位。當(dāng)按下開關(guān) key1 時(shí)， 16個(gè) LED 發(fā)光二極管閃爍第一種彩燈方式；當(dāng)按下開關(guān) key2 時(shí)， 16個(gè) LED發(fā)光二極管閃爍第二種彩燈方式；同理，當(dāng)按下開關(guān) key3 時(shí)， 16個(gè) LED 發(fā)光二極管閃爍第三種彩燈方式；當(dāng)按下開關(guān) key4 時(shí)， 16 個(gè) LED 發(fā)光二極管閃爍第四種彩燈方式。為了不讓流過 LED的電流太大而把它燒壞，還得串上限流電阻 R， 當(dāng) P0和 P2 口輸出高電平（ +5V）時(shí)， LED 兩端沒有電壓降，所以熄滅；當(dāng) P0 和 P2 口輸出低電平（即 P0/P2=0）時(shí) , LED 正向?qū)òl(fā)光。在 FIASH 編程時(shí)， P0口作為原碼輸入口，當(dāng) FIASH 進(jìn)行校驗(yàn)時(shí)， P0 輸出原碼，此時(shí) P0 外部必須被拉高。 P2口當(dāng)用于外部程序存儲(chǔ)器或 16 位地址外部數(shù)據(jù)存儲(chǔ)器進(jìn)行存 取時(shí)， P2口輸出地址的高八位。 P3口同時(shí)為閃爍編程和編程校驗(yàn)接收一些控制信號(hào)。此時(shí)， ALE 只有在執(zhí)行 MOVX， MOVC 指令是 ALE 才起作用。在本設(shè)計(jì)中，對(duì) ROM 的讀操作只在內(nèi)部程序存儲(chǔ)器中，所以 EA 置應(yīng)高電平。例如，當(dāng)給 口輸出 “ 0”時(shí)，發(fā)光二極管點(diǎn)亮， 當(dāng)輸出“ 1”時(shí)，發(fā)光二極管熄滅。 //1,3,5,7 const tab5[]={0xFF,0x7F,0x5F,0x57,0x55,0x54,0x50,0x40,0x00}。i++)。 for(i=0。 for(i=0。 for(i=0。 for(i=0。 } 17 void fun3(void) { uchar i。 return。 delay(20210)。 delay(25000)。 delay(10000)。 if(state!=4) { P0=0xFF。 P2=0xFF。 P2=0xFF。 P2=0xFF。 return。 } } P2=0xFF。 } } P0=0xFF。 case 0xFD:state=2。break。 IE|=0x86。 case 2:fun2()。break。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s own path. He urges the reader to find rectitude and lead a moral life. He professes that, only by being self reliant, as opposed to relying on the government and being dictated to by society, can one begin leading a decent and purposeful life. He avers that such a life is the only life worth living. I agree with him. This essay was written during a time of social upheaval in America, and it is rather odd that Emerson authored it, as he was a part of the upper crust of society at the time. It just so happened that he looked around him, at the indolence and the wantonness of the people in his circle。 work lives easier, but I simply could not digest the fact that that was my sole purpose in life. With no family to support, I was the sole beneficiary of my employment: the paycheck, the benefits, the incentives and the rewards were mine alone. Not much of a purpose in being selfserving, is there? While I was