【正文】 它采用 ATMEL 的高密非易失存儲技術制造并和工業(yè)標準 MCS— 51 指令集和引腳結(jié)構兼容。 影響遙控器遙控距離（ Remote distance of RF Remote Control）的因素主要有如下幾點： 發(fā)射功率：發(fā)射功率大則距離遠，但耗電大，容易產(chǎn)生干擾； 接收靈敏度：接收器的接收靈敏度提高，遙控距離增大，但容易受干擾造成誤動 或失控； 天線：采用直線型天線，并且相互平行，遙控距離遠，但占據(jù)空間大，在使用中把天線拉長、拉直可增加遙控距離； 高度：天線越高，遙控距離越遠，但受客觀條件限制； 阻擋：目前使用的無線遙控器使用國家規(guī)定的 UHF 頻段，其傳播特性和光近似，直線傳播，繞射較小，發(fā)射器和接收器之間如有墻壁阻擋將大大打折遙控距離，如果是鋼筋混泥土的墻壁，由于導體對電波的吸收作用，影響更甚。 一般情況下，接收端除了幾位數(shù)據(jù)輸出外，還應有一位 “ 數(shù)據(jù)有效 ” 輸出端，以便后級適時地來取數(shù)據(jù)。有時亦稱這種輸出形式為 “ 反相 ” 。此處的 “ 有效脈沖 ”和 “ 有效電平 ” ，可能是高、也可能是低，取決于相應輸出腳的靜態(tài)狀況，如靜態(tài)時為低，則 “ 高 ” 為有效；如靜態(tài)時為高，則 “ 低 ” 為有效。當發(fā)射端按下某一按鍵時，相應地在接收端有不同的輸出狀態(tài)。由于其無法穿透墻壁，故不同房間的家用電器可使用通用的遙控器而不會產(chǎn)生相互干擾；電路調(diào)試簡單，只要按給定電路連接無誤，一般不需任何調(diào)試即可投入工作；編解碼容易，可進行多路遙控。在發(fā)射端要對晶振進行整數(shù)分頻，分頻系數(shù)一般取 12，所以455kHz247。紅外接收頭的引腳排列因型號不同而不盡相同，可參考廠家的使用說明。 前些年常用 μPC1373H 、 CX20216A 等紅外接收專用放大電路。接收部分的紅外接收管是一種光敏二極管。目前大量使用的紅外發(fā)光二極管發(fā)出的紅外線波長為 940nm 左右，外形與普通 5發(fā)光二極管相同，只是顏色不同。紅外線遙控就是利用波長為 ～ 之間的近紅外線 來傳送控制信號的。s output. 3) the software and hardware constraints. AT89C2051 Due to the foot of the chip AT89C2051, no set limits of external storage interface, so, for external memory read/write instructions as MOVX etc. Due to 2KB ROM, so, the space to jump instruction should pay attention to the destination address range (transfer 000H 7FFH), beyond the range of addresses, will not meet wrong results. The scope of data storage is 00H (7FH when stack manipulation), also should be noticed. The input signal is simulated by the original foot into the microcontroller, so the original foot Unable to external use. Simulation parator can pare two simulation, if the size of the voltage external A D/A converter and its output as A parator analog input, and by simulating the parator another input voltage to be measured, through the introduction of the software method can realize the A/D conversion. 4 the Flash memory AT89C2051) Provide a 2KB of singlechip AT89C2051 in Flash memory chips, which allows the online program to modify or use special programming programming. A） . Flash memory encryption AT89C2051 SCM has 2 encryption, can programming (P) or programming (U) to obtain different encryption functionality. Encryption functionality table as shown in table 11. Table 11 LB1 LB2 Encryption functionality U U No encryption functionality P U Prohibit to flash to programming P P Prohibit to flash to programming， Also banned program Encrypt a content erased only through chips to erase operation. B） . Flash memory programming and procedures Infrared Remote And Chips Are Introduced 7 (1) the piece inside chip AT89C2051 Flash memory programming model as shown in table 12. Table 12 AT89C2051 microcontroller programming model Mode RESET Write code data 12V L H H H Read code data H H L L H H Write code data LB1 Write code data LB2 12V H H H H 12V H H L L Chip erased 12V H L L L Read the signal bytes H H L L L L . Note: (1) the counters RESET at an EPROM inside the rising edge, and 000H RESET to XTAL1 by foot is executed, pulse count, (2) pieces of 10ms to erase PROG pulse, (3 )during the programming pulled low RDY/BSY instructions. C).A T89C2051 SCM in Flash memory chips programming steps are as follows: 1. in the sequence is the VCC GND pin, add working voltage, XTAL1 pin RESET, receiving GND pin, other than the above time, waiting for 10ms, 2. In pin RESET, heightening level, 3. In , , , pin。 畢業(yè)設計 外文翻譯 多 紅外遙控及芯片介紹 學 院： 電氣與電子工程學院 專 業(yè)： 電子信息工程 學生姓名 ： 學 號： 指導教師 ： 2021 年 6 月Infrared Remote And Chips Are Introduced 1 Infrared Remote And Chips Are Introduced People39。 12 hundredth kHz 38kHz hundredth 379,000. Some remote control system adopts 36kHz, 56kHz, etc, general 40kHz launched by the crystals of oscillation frequency to decide. Infrared remote characteristic is not influence the surrounding environment and does not interfere with other electric equipment. Due to its cannot perate walls, so the room can use mon household appliance of remote control without mutual interference, Circuit testing is simple, as long as given circuit connection, generally does not need any missioning can work, Decoding easily