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【正文】 2KB的 Flash存儲器; 工作電壓范圍 — 6V; 128KB的數(shù)據(jù)存儲器; 全靜態(tài)工作方式: 0— 24MHz; 15根輸入 /輸出線; 一個可編程串行口; 2個 16位定時 /計數(shù)器; 有片內(nèi)精密模擬比較器; 5個中斷源, 2個優(yōu)先級。 和 要求外部上拉電阻。 P3 口緩沖器可吸收 20mA 電流。每一個機器周期需 12 個振蕩器或時鐘周期。模擬比較器可以方便的比較兩個模擬電壓的大小,若外接一個D/A轉(zhuǎn)換器并將其輸出作為模擬比較器的一個輸入,而由模擬比較器的另一個輸入端引入被測電壓,通過軟件的方法也可以實現(xiàn) A/D轉(zhuǎn)換。 下電次序為:設(shè)置 XTAL RESET 為“ L” ,浮空其它 I/O 引腳,關(guān)閉 VCC 電源。 很多人都有這樣的想法:躺在床上不愿去關(guān)燈,坐在沙發(fā)上不愿意起來切換燈開光等:此課題的創(chuàng)新性就在 于使用遙控的方式來實現(xiàn)燈的關(guān)閉,滿足人的需求,目前市場還沒有出現(xiàn)這個產(chǎn)品,很有競爭力。s output. P3 mouth function as is shown in table 1. Table 1 P3 mouth pin Function RXD(Serial input) TXD(Serial output port) INT0(External interruption 0) INT1(External interruption 1) TO(The timer 0 external input) T1(The timer 1 external input) 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 (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。 附件 2:外文原文(復(fù)印件) Infrared Remote And Chips Are Introduced People39。使我們的生產(chǎn)生活更加豐富多彩。 加密位內(nèi)容的擦除只能通過片擦除操作來完成。 表 1 P3 口引腳 功能 RXD(串行輸入端口 ) TXD(串行輸出端口 ) INT0(外中斷 0) INT1(外中斷 1) TO(定時器 0 外部輸入 ) T1(定時器 1 外部輸入 ) 3). AT89C2051的軟硬件約束 AT89C2051單片機由于引腳的限制,沒有設(shè)置外部存儲器的接口,所以,對于外部存儲器的讀 /寫指令如 MOVX等不起作用。 P3 口還接收一些用于閃速存儲器編程和程序校驗的控制信號。當(dāng)引腳~ 用作輸入并被外部拉低時 ,它們將因內(nèi)部的上拉電阻而流出電流(IIL)。 圖 b AT89C2051 的引腳圖 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 89C2051 RST/VPP (RXD) (TXD) XTAL2 XTAL1 (INT0) (INT1) (T0) (T1) GND VCC (AIN1) (AIN0) AT89C2051 引腳功能: 1. Vcc:電源電壓。它采用 ATMEL的高密非易失存儲技術(shù)制造并和工業(yè)標(biāo)準(zhǔn) MCS— 51指令集和引腳結(jié)構(gòu)兼容。 一般情況下,接收端除了幾位數(shù)據(jù)輸出外,還應(yīng)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)。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(yīng)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。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。紅外接收頭的
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