【正文】 成。他們有一個(gè)很重要的特點(diǎn)，其振蕩頻率與他們的形狀，材料，切割方向等密切相關(guān)。根據(jù)石英晶體的機(jī)電效應(yīng)，我們可以把它等效為一個(gè)電磁振蕩回路，即諧振回路。在電路中的應(yīng)用實(shí)際上是把它當(dāng)作一個(gè)高Q值的電磁諧振回路。 實(shí)現(xiàn)功能通過振蕩得到一個(gè)穩(wěn)定的時(shí)鐘頻率。其電路原理圖設(shè)計(jì)如圖313所示。圖中的電容起穩(wěn)定作用。這樣就可以方便在單片機(jī)死機(jī)的時(shí)候進(jìn)行重啟。(2) 程序的總體設(shè)計(jì)并畫出流程圖?？稍诰幾g軟件下編程，要求簡(jiǎn)練、層次清楚、字節(jié)數(shù)少和執(zhí)行時(shí)間短等。(5) 編寫程序說明文件。(2) 劃分功能模塊進(jìn)行設(shè)計(jì)。 Keil 簡(jiǎn)介Keil uVision2是德國(guó)Keil公司開發(fā)的一款關(guān)于8051系列MCU的開發(fā)工具，它支持匯編、C語言及混合編程，是一種集成化的文件管理編譯環(huán)境，可用來編譯程序源碼、鏈接和重定位目標(biāo)文件和庫(kù)文件、創(chuàng)建HEX文件、調(diào)試目標(biāo)程序等。在keil uVision2 中編制程序：(1)新建項(xiàng)目。項(xiàng)目文件保存完后，彈出Select Device for TARGET‘TARGET1’對(duì)話框，是新建項(xiàng)目的CPU元器件選擇，選AT89S52。在菜單中選擇File→New，新建源程序文件。接下來，將該文件添加到項(xiàng)目中，用鼠標(biāo)在屏幕左邊的Source Group1文件夾圖標(biāo)上右擊彈出菜單，選擇Add File to Group‘Source Group1’命令，彈出文件窗口，選擇剛剛保存的文件，按ADD按鈕，關(guān)閉文件窗口，程序文件即可加到項(xiàng)目中。將光標(biāo)指向項(xiàng)目窗口中的文件名，并右擊，在快捷菜單中選擇Build target選項(xiàng)，uVision2將自動(dòng)完成對(duì)當(dāng)前項(xiàng)目中所有源程序模塊的編譯、鏈接。其中布防/撤防按鍵用來觸發(fā)外部中斷0，熱釋電傳感器用來觸發(fā)外部中斷1，外部中斷1允許位的開啟與關(guān)閉由外部中斷0來控制。定時(shí)計(jì)數(shù)器T0用來控制高音報(bào)警器的發(fā)音頻率以使其發(fā)出逼真的報(bào)警聲；定時(shí)計(jì)數(shù)器T1用作延時(shí)函數(shù)。圖42外部中斷1請(qǐng)求延時(shí)10S數(shù)碼管顯示E，炫目燈開啟。它具有使用簡(jiǎn)單、功能齊全、性價(jià)比高等一系列特點(diǎn)，是一種經(jīng)濟(jì)型、實(shí)用型的家庭防盜報(bào)警系統(tǒng)。該防盜報(bào)警器通過以單片機(jī)AT89C51為工作處理器核心，外接熱釋電紅傳感器，它是一種新穎的被動(dòng)式紅外探測(cè)器件，能夠以非接觸方式探測(cè)出人體發(fā)出的紅外輻射，并將其轉(zhuǎn)化為相應(yīng)的電信號(hào)輸出，同時(shí)能夠有效的抑制人體輻射波長(zhǎng)以外的紅外光線與可見光的干擾。隨著現(xiàn)代人們安全意識(shí)的增強(qiáng)以及科學(xué)技術(shù)的快速發(fā)展，相信報(bào)警器必將在更廣闊的領(lǐng)域得到更深層次的應(yīng)用。78[7] 韓毅。安防科技。家庭無線智能防盜報(bào)警系統(tǒng)[J]。2003年07期[9] 宋松娥。中國(guó)安防產(chǎn)品信息。家庭無線智能防盜報(bào)警系統(tǒng)[J]。2003年03期[11] 王洪建。第七屆青年學(xué)術(shù)會(huì)議論文集[C]。基于單片機(jī)控制的自動(dòng)撥號(hào)報(bào)警器[A]。2004年[13] 王洪。湖南省電工技術(shù)學(xué)會(huì)第七次會(huì)員代表大會(huì)暨2004學(xué)術(shù)年會(huì)論文集[C]。袁老師嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、精益求精的工作作風(fēng)和對(duì)學(xué)生盡職盡責(zé)的教導(dǎo)都給我留下了十分深刻的印象。論文工作即將結(jié)束，回顧四年多來的學(xué)習(xí)經(jīng)歷，面對(duì)現(xiàn)在的收獲，我感到無限欣慰。為此，我向熱心幫助過我的所有老師和同學(xué)表示由衷的感謝! 再次衷心感謝在百忙之中指導(dǎo)我完成論文和參加畢業(yè)答辯的各位老師。 sbit led=P1^0。 sbit star=P0^7。 for(i=0。i++) { FRQ++。 TL1=(6553620000)%256。 TF1=0。 TL0=FRQ。 }/*****外部中斷1，檢測(cè)到傳感器信號(hào)后進(jìn)行報(bào)警控制*****/void EX1_INT() interrupt 2{P0=0X79。 //炫目燈開啟TR0=1。TR0=0。 led=0。} /**********/void EX0_INT() interrupt 0{EX1=~EX1。 led=0。}/*****主函數(shù)*****/void main(){P0=0X00。 //關(guān)閉炫目燈spk=0。 //開啟中斷總允許位EX0=1。 //關(guān)閉 外部中斷1允許位ET0=0。 //開啟 定時(shí)中斷T0允許位IT1=1。 //設(shè)置外部中斷0為觸發(fā)方式為下降沿TMOD=0X11。 //對(duì)定時(shí)計(jì)數(shù)器T0賦初值TL0=0XFF。 //關(guān)閉定時(shí)/計(jì)數(shù)器T0,由外部中斷1控制開啟TR1=1。delay(10)。 you don39。 your employer dismisses you and you think that you have been dismissed unfairly.For more information about dismissal and unfair dismissal, seetagainst the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal.Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining 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 organisations listed underFurther 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 at charge you more than 35% of your pensation a damagesbased agreement, you should make sure you39。To find your nearest CAB, including those that give advice by , click onEmployment tribunals.The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s 150th anniversary celebrations and will attend City39。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa hasfor the racist behaviour of their fans durings 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(diǎn)什么，或者寫點(diǎn)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(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。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。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。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，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(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)還沒有開始就宣告了終結(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。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 jumpWhen 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 w