【正文】 s trigger, restore to the throne circuit sample to output , Schmitt of trigger constantly in each S5P2 , machine of cycle in having one more , then just got and restored to the throne and operated the necessary signal insidly. Restore to the throne resistance of circuit generally, electric capacity parameter suitable for 6 brilliant to shake, can is it restore to the throne signal high level duration greater than 2 machine cycles to guarantee. Being restored to the throne in the circuit is simple, its function is very important. Pieces of onechip puter system could normal running,should first check it can restore to the throne not succeeding. Checking and can pop one39。 P0 mouth is a twoway bus, send the introduction of 8 low addresses and data / export in timesharing Output grade , P3 of mouth , P1 of P1 , connect with inside have load resistance of drawing , every one of they can drive 4 Model LS TTL load to output. As while inputting the mouth, any TTL or NMOS circuit can drive P1 of 8051 onechip puters as P3 mouth in a normal way . Because draw resistance on output grade of them have, can open a way collector too or drainsource resistance is it urge to open a way, do not need to have the resistance of drawing outerly . Mouths are all accurate twoway mouths too. When the conduct is input, must write the corresponding port latch with 1 first . As to 80C51 onechip puter, port can only offer milliampere of output electric currents, is it output mouth go when urging one ordinary basing of transistor to regard as, should contact a resistance among the port and transistor base , in order to the electricity while restraining the high level from exporting P1~P3 Being restored to the throne is the operation of initializing of an onechip puter. Its main function is to turn PC into 0000H initially , make the onechip puter begin to hold the conduct procedure from unit 0000H. Except that the ones that enter the system are initialized normally,as because procedure operate it make mistakes or operate there aren39。[6] T. C. Grenfell, S. G. Warren, and P. C. Mullen, Reflection of SolarRadiation by the Antarctic Snow Surface at Ultraviolet, Visible, and nearInfrared Wavelengths, Journal of Geophysical ResearchAtmospheres 99, 1866918684 (1994).[7] Johan Casselgren, Mikael Sjodahl,and James spectral response from covered OPTICS,2007(20):42774288[8] 劉俊，:電子工業(yè)出版社,2005[9] 李遠(yuǎn)明，,2007(8):5153[10] 孫紅兵, 2007（4）18156[11] 趙玉生,劉建斌. 智能微弱光數(shù)字檢測儀電路設(shè)計(jì) 2004(06):015702[12] 孫涵芳,，2006[13] ，[14] , [20][15] 康華光,陳大欽,（模擬部分）高等教育出版社 2007[16] ，[17] 汪方斌. ,[18] 汪方斌. ,[19] [20] [21] [22] [23] [24] [25] ，附錄一 火災(zāi)自動報(bào)警原理圖附錄二 文獻(xiàn)翻譯Structure and function of the MCS51 series Structure and function of the MCS51 series onechip puter MCS51 is a name of a piece of onechip puter series which Intel Company produces. This pany introduced 8 topgrade onechip puters of MCS51 series in 1980 after introducing 8 onechip puters of MCS48 series in 1976. It belong to a lot of kinds this line of onechip puter the chips have,such as 8051, 8031, 8751, 80C51BH, 80C31BH,etc., their basic position, basic performance and instruction system are all the same. 8051 daily representatives 51 serial onechip puters . An onechip puter system is made up of several following parts: ( 1) One microprocessor of 8 (CPU). ( 2) At slice data memory RAM (128B/256B),it use not depositting not can reading /data that write, such as result not middle of operation, final result and data wanted to show, etc. ( 3) Procedure memory ROM/EPROM (4KB/8KB ), is used to preserve the procedure , some initial data and form in slice. But does not take ROM/EPROM within some onechip puters, such as 8031 , 8032, 80C ,etc.. ( 4) Four 8 run side by side I/O interface P0 four P3, each mouth can use as introduction , may use as exporting too. ( 5) Two timer / counter, each timer / counter may set up and count in the way, used to count to the external incident, can set up into a timing way too, and can according to count or result of timing realize the control of the puter. ( 6) Five cut off cutting off the control system of the source . ( 7) One all duplexing serial I/O mouth of UART (universal asynchronous receiver/transmitter (UART) ), is it realize onechip puter or onechip puter and serial munication of puter to use for. ( 8) Stretch oscillator and clock produce circuit, quartz crystal finely tune electric capacity need outer. Allow oscillation frequency as 12 megahertas now at most. Every the abovementioned part was joined through the inside data bus .Among them, CPU is a core of the onechip puter, it is the control of the puter and mand centre, made up of such parts as arithmetic unit and controller , etc.. The arithmetic unit can carry on 8 persons of arithmetic operation and unit ALU of logic operation while including one, the 1 storing device temporarilies of 8, storing device 2 temporarily, 839。[2] 謝靜芳,呂得寶,2006(6)：1821[3] 胡功宏,黃新民,王小光,2008(5):5659 [4] A. W. Nolin, and J. Dozier, A Hyperspectral Method for Remotely Sensing the Grain Size of Snow, Remote Sensing of Environment 74, 207216 (2000)。str246。而我們?yōu)樗麄冏龅膮s很少很少，真心感謝他們。畢業(yè)設(shè)計(jì)是我們在大學(xué)四年的句號，我們即將步入社會，回首我們的學(xué)生生涯，給與我們最多的就是我們的父母。特此感謝！通過本次設(shè)計(jì)，讓我明白了很多。他們給了我很多的建議和幫助。在汪老師的指導(dǎo)和鼓勵下，我才有信心去完成畢業(yè)設(shè)計(jì)，很榮幸成且幸運(yùn)成為汪老師的學(xué)生。在設(shè)計(jì)的過程中，遇到很小的問題，都要勞煩老師講解。還有，人要不斷的接受新知識，學(xué)習(xí)新知識，這樣才能在以后的人生道路上堅(jiān)強(qiáng)的走下去。尤其在我剛拿到一個帶有陌生專業(yè)術(shù)語的題目想退縮時(shí)，汪老師的一翻教導(dǎo)令我受益匪淺。汪老師學(xué)識淵博，學(xué)風(fēng)嚴(yán)謹(jǐn)，待人寬厚。由于車內(nèi)環(huán)境和室內(nèi)環(huán)境差別較大，因此對火災(zāi)探測器的要求也有所不同，例如：考慮到室外溫度較高，溫度報(bào)警上限應(yīng)相應(yīng)提高等。這體現(xiàn)了自動化、高效化與智能化。故一個小小的畢業(yè)設(shè)計(jì)，對我們的作用是如此之大。而且還可以記住很多東西。所以這幾天不管是吃飯還是睡覺，腦子里總是想著如何解決這些問題，如何想出更好的連接方法。使我在單片機(jī)的基本原理、單片機(jī)應(yīng)用系統(tǒng)開發(fā)過程，以及在常用編程設(shè)計(jì)思路技巧的掌握方面都能向前邁了一大步，為日后成為合格的應(yīng)用型人才打下良好的基礎(chǔ)。在實(shí)際應(yīng)用中遇到很多的問題，這都需要我對問題進(jìn)行具體的分析，并一步一步地去解決它。通過這次的畢業(yè)設(shè)計(jì)，我學(xué)到了很多東西，通過自己的實(shí)踐，增強(qiáng)了動手能力。本設(shè)計(jì)以單片機(jī)為核心，應(yīng)用了A/D轉(zhuǎn)換、顯示裝置報(bào)警，電路完成了火災(zāi)的報(bào)警。由模擬結(jié)果可以看到，本設(shè)計(jì)可以達(dá)到預(yù)計(jì)要求，在溫度與煙霧濃度都超過設(shè)定上限時(shí)，發(fā)出聲光報(bào)警，從而做到對火災(zāi)的自動報(bào)警功能。注意細(xì)節(jié)！6 . 結(jié)果經(jīng)過有keil軟件的編程生成hex文件，由proteus軟件仿真模擬結(jié)