【正文】 resistors twoway I/O port, P2 mouth to receive, the output buffer 4 TTL gate current, when P2 mouth is written 1, its tube feet are internal pullup resistors, and push as input. And so as the input, P2 mouth feet are external down tube, will output current. This is due to internal pull up sake. P2 mouth when used external program memory or 16 address external data memory access, P2 mouth high output address eight. In a given address 1, it using internal and external 8 address advantage, when for reading and writing data memory, P2 when the special function registers mouth output of content. P2 mouth in FLASH programming and the calibration eight address when receiving high signal and control signals.P3 mouth: P3 mouth pipe is 8 feet with internal pullup resistors twoway I/O port, may receive four TTL gate current out put. When P3 mouth writing 1, they are internal and high level, and used as input. As input, due to external dropdown for low level, P3 mouth will output current (ILL) this is due to pull up39。 C, in 10 ~ + 85 176。(2) temperature measuring range: 55 ℃ ~ + 125 in 10 ~ + 85 ℃ to + ℃ when precision。t because when heating and burned, but can39。s most advanced, the most plete various types of micro controller system design and simulation platform. It really realized plete on puter schematic design, from circuit analysis and simulation and singlechip microputer and grade debugging and simulation, code system test and functional verification of the PCB formation to plete the design and development process of electronic. Proteus product series also contains a revolutionary VSM technology based on micro control, can the design with all peripheral electronic device simulation together. First start Proteus and Proteus ponents from the library selection need drawing diagram and set ponent, the corresponding element parameter values. KeilcKeil Vision 2 is about the 8051 series MCU Keil pany of development tools can be used to pile C source code, assemblers source program, connection and relocation target files and libraries, gen built: documents, debugging purposes procedure, etc, it is a kind of integration of document management pile environment. It integrates document editing processing, pile connection, project management, window, tools cited and software copy true debugging and other functions, is pretty powerful development tool. In keil inside pile, the procedures required missioning. alignment(1) detection TCP/IP.(2) duplicate the Proteus installation directory vdm51. Who folder keilc/C51 / DLL to bin directory. (3) modify the installation directory Keil tools. TDRV4 = BIN, add the DLL. VDM51. \(4) in the schematic drawing Proteus, in Debug menu, select Use Remote Debug hand .(5) in open in a project Keil, rightclick Target1, choose for Target 39。自18世紀工業(yè)時代以來，工業(yè)革命對能否控制，發(fā)送顯示溫度有著絕對的聯(lián)系。該傳感器是采用硅半導體集成工藝制成，因此亦稱硅傳感器或單片集成溫度傳感器。某些增強型集成溫度控制器(例如 TC652/653)中還包含了 A/D 轉(zhuǎn)換器以及固化好的程序，這些工藝與智能溫度傳感器有某些相似之處。有的產(chǎn)品還帶多路選擇器、中央控制器(CPU)、隨機存取存儲器(RAM)和只讀存儲器(ROM)。對于單點溫測儀表，主要采用傳統(tǒng)的模擬集成溫度傳感器，其中又以熱電阻、熱電偶等傳感器的測量精度 高，測量范圍大，而得到了普遍的應用。該類儀表可很好的滿足單個用戶單點測量的需要。第一個數(shù)碼管顯示所采集的是哪一路，哪個通道。這種方案雖然占用單片機的四個IO口，但在單片機IO口不緊缺的情況下采用這種方案大大的簡化了編程難度，縮短了設計周期，同時也能保證系統(tǒng)的穩(wěn)定。該器件采用ATMEL高密度非易失存儲器制造技術(shù)制造，與工業(yè)標準的MCS51指令集和輸出管腳相兼容。與MCS51 兼容 　　全靜態(tài)工作：0Hz24MHz 　　兩個16位定時器/計數(shù)器 　　片內(nèi)振蕩器和時鐘電路管腳說明：VCC：供電電壓。P0能夠用于外部程序數(shù)據(jù)存儲器，它可以被定義為低八位數(shù)據(jù)或地址總線。在FLASH編程和校驗時，P1口作為高八位地址接收。P2口當用于外部程序存儲器或16位地址外部數(shù)據(jù)存儲器進行存取時，P2口輸出地址的高八位。當P3口寫入高電平后，它們被內(nèi)部上拉為高電平，并用作輸入。 ALE/PROG：當訪問外部存儲器時，地址鎖存允許的輸出電平用于鎖存地址的地位字節(jié)。然而要注意的是：每當用作外部數(shù)據(jù)存儲器時，將跳過一個ALE脈沖。如果微處理器在外部執(zhí)行狀態(tài)ALE禁止，置位無效。 /EA/VPP：當/EA保持低電平時，則在此期間外部程序存儲器（0000HFFFFH），不管是否有內(nèi)部程序存儲器。 XTAL2：來自反向振蕩器的輸出。C~+125176。C。而且新一代產(chǎn)品更便宜，體積更小?？蛇x更小的封裝方式，更寬的電壓適用范圍。測溫范圍：55~+125℃，在10~+85℃時精度為177。負壓特性：電源極性接反時，溫度計不會因發(fā)熱而燒毀，但不能正常工作。 DQ為數(shù)字信號輸入/輸出端； (2) Proteus 不僅是模擬電路、數(shù)字電路、模／數(shù)混合電路的設計與仿真平臺， 更是目前世界最先進、 最完整的多種型號微控制器系統(tǒng)的設計與仿真平臺。. 軟件仿真采用KeilμVision 2 KeilμVision 2 是 Keil 公司關于 8051 系列 MCU 的開發(fā)工具，可以用來編譯 C 源碼、匯編源程序、連接和重定位目標文件和庫文件、創(chuàng) 建 HEX 文件、調(diào)試目標程序等，是一種集成化的文件管理編譯環(huán)境。 (2)復制 Proteus 安裝目錄下的 MODELS 文件夾里的 vdm51．dll 到 keilc／C51／bin 目錄。在打開的對話框中選擇“Debug”選項 卡，選擇使用 Proteus VSM Emulator 仿真，單擊 “Ok”完成 Debug 設置。