【正文】 reduce the loss caused by fire effective method. This paper is a paragraph based on SCM intelligence fire alarm system. In the article, I the SCM and other hardware are introduced. Meanwhile of temperature sensors and smoke sensor has certain instructions. With the rapid development of modern science and technology, and the fire alarm system increasingly perfect, tend to intelligence. Intelligent fire alarm system to solve the fire alarm system of two difficulties existing provides a new method and means, and can effectively deal with fire authenticity. KEYWARDS： microcontroller， fire， alarm system 安徽理工大學畢業(yè)設計 i 目錄 摘要 ................................................................... I ABSTRACT .............................................................. II 1 緒論 ................................................................. 1 選題背景 ........................................................ 1 智能火災報警系統(tǒng) ................................................ 1 火災探測器 ...................................................... 2 火災探測器簡介 ............................................................................................................................. 2 火災探測器發(fā)展特點 ................................................................................................................... 3 火災探測器新技術(shù) ........................................................................................................................ 3 2 總體設計及方案論證 ................................................... 5 工藝技術(shù)要求 .................................................... 5 系統(tǒng)設計思想 .................................................... 5 方案論證 ........................................................ 6 3 單片機 AT89C51 原理 ................................................... 8 引腳說明 ........................................................ 8 主要性能參數(shù) ................................................................................................................................... 8 工作特性 ....................................................... 11 時鐘振蕩器 ...................................................................................................................................... 11 空閑節(jié)電模式 ................................................................................................................................. 12 掉電模式 ........................................................................................................................................... 13 程序存儲器的加密 ...................................................................................................................... 13 Flash 閃速存儲器的編程 ....................................................................................................... 13 編程方式 ........................................................................................................................................... 14 數(shù)據(jù)查詢 ........................................................................................................................................... 14 Ready/Busy ...................................................................................................................................... 14 程序效驗 ........................................................................................................................................... 15 Flash 編程和效驗的波形時序 .......................................................................................... 15 芯片擦除 ......................................................................................................................................... 16 讀片內(nèi)簽名字節(jié) ......................................................................................................................... 16 編程接口 ......................................................................................................................................... 16 4 前向通道的設計 ...................................................... 18 溫度傳感器 ..................................................... 18 工作原理 ........................................................................................................................................... 18 試驗結(jié)果 ........................................................................................................................................... 20 安徽理工大學畢業(yè)設計 ii 間歇激勵方 式的效果 ................................................................................................................. 21 運算放大器 AD595 ................................................ 22 A/D 轉(zhuǎn)換器 ...................................................... 23 A/D 轉(zhuǎn)換器的主要參數(shù) ............................................................................................................. 23 A/D 轉(zhuǎn)換器與 CPU的接口方法 ............................................................................................. 23 A/D 轉(zhuǎn)換器與 CPU之間傳送數(shù)據(jù)的方法 ....................................................................... 24 A/D轉(zhuǎn)換芯片 ADC0809 及其接口 ................................................................................... 24 接口電路 ........................................................................................................................................... 26 8255 擴展 ....................................................... 26 8255A 的內(nèi)部結(jié)構(gòu) ....................................................................................................................... 26 8255A 的工作方式 ....................................................................................................................... 27 AT89C51 單片機與 8255A 的接口的實現(xiàn) ....................................................................... 28 鍵盤顯示 ....................................................... 28 系統(tǒng)電源 ....................................................... 30