【正文】 與主板 CPU 通信等。在由外部程序存儲(chǔ)器取指期間，每個(gè)機(jī)器周期兩次 /PSEN 有效。在平時(shí)， ALE 端以不變的頻率周期輸出正脈沖信號(hào)，此頻率為振蕩器頻率的 1/6。 P2 口在 FLASH 編程和校驗(yàn)時(shí)接收高八位地址信號(hào)和控制信號(hào)。 P1口管腳寫入 1后，被內(nèi)部上拉為高，可用作輸入， P1 口被外部下拉為低電平時(shí)，將輸出電流，這是由于內(nèi)部上拉的緣故。 4. 利用字符型液晶顯示； 5. 分別能顯示“ dian zi 1101 ban shao wen ji”和“ Good Good Study Day Day Up”證明能對 Led 的顯示進(jìn)行控制 第 2章 系統(tǒng)硬件設(shè)計(jì) 系統(tǒng)流程圖 LCD顯示屏控制程序流程圖如下所示： LCD 顯示屏控制 程序 使用元件 （ 1） AT89C52：單片機(jī)； （ 2） RES：電阻； （ 3） LMO16L： 16 2字符 LCD 顯示屏； 3 （ 4） CAP/CAPELEC：電容、電解電容； （ 5） CRYSTAL：晶振； 電路模塊介紹 （ 1） 單片機(jī)模塊 AT89C52： AT89C52 是一個(gè)低電壓，高性能 CMOS 8 位單片機(jī)，片內(nèi)含 8k bytes 的可反復(fù)擦寫的 Flash 只讀程序存儲(chǔ)器和 256 bytes 的隨機(jī)存取數(shù)據(jù)存儲(chǔ)器（ RAM），器件采用 ATMEL公司的高密度、非易失性存儲(chǔ)技術(shù)生產(chǎn)，兼容標(biāo)準(zhǔn) MCS51 指令系統(tǒng)，片內(nèi)置通用 8 位中央處理器和 Flash 存儲(chǔ)單元，功 能強(qiáng)大的 AT89C52 單片機(jī)可為您提供許多較復(fù)雜系統(tǒng)控制應(yīng)用場合。使硬件在軟件的控制下協(xié)調(diào)運(yùn)作。在實(shí)時(shí)檢測和自動(dòng)控制的單片機(jī)應(yīng)用系統(tǒng)中，單片機(jī)往往是作為一個(gè)核心部件使用，根據(jù)具體硬件結(jié)構(gòu)以及具體應(yīng)用對象的特點(diǎn)，與 軟件相結(jié)合，加以完善。本文撰寫的主導(dǎo)思想是軟、硬件相結(jié)合，以硬件為基礎(chǔ)，來進(jìn)行各功能模塊的編寫。 1 基于單片機(jī)的 LCD 顯示器控制 設(shè)計(jì) 摘要： LCD液晶顯示已經(jīng)是人機(jī)界面的關(guān)鍵技術(shù)。 關(guān)鍵詞： AT89C52：單片機(jī)； LMO16L： 16 2 字符 LCD 顯示屏 2 LCD display based on SCM control Abstract： LCD liquid crystal display is the key technique of the manmachine interface. This paper studied the MCU control system based on LCM liquid crystal display module. The first chapter introduces the subject background of the topic, research significance and function. This system on software design based on C language, the instruction carries out the speed quick, save storage space. In order to facilitate the expansion and the change, the software design uses the modular structure, make the logic relation of program design more concise. The hardware to coordinate the operation under the software control. The text first briefly describe the working principle of the system hardware, and attached to the system hardware design block diagram, and introduces the history of the development of microprocessor, and discusses the function and working process of the graduation design, the application of the hardware interface technology and the interface module, and the concrete description of AT89C52: single chip microputer。其 控制系統(tǒng) 已 能夠取代復(fù)雜電子線路或數(shù)字電路構(gòu)成的控制系統(tǒng)， 單片機(jī) 以軟件 編程 來實(shí)現(xiàn) 電子線路的外圍 控制，并能夠?qū)崿F(xiàn)智能化 。 正文中首先簡單描述系統(tǒng)硬件工作原理，且附以系統(tǒng)硬件設(shè)計(jì)框圖，并介紹了單片機(jī)微處理器的發(fā)展史，論述了本次畢業(yè)設(shè)計(jì)所應(yīng)用的各硬件接口技術(shù)和各個(gè)接口模塊的功能及工作過程 , 并具體描述了 STC89C5 SMC1602A 液晶顯示的軟、硬件調(diào)試。 AT89C52 有 40 個(gè)引腳， 32 個(gè)外部雙向輸入 /輸出（ I/O）端口，同時(shí)內(nèi)含 2 個(gè)外中斷口， 3 個(gè) 16 位可編程定時(shí)計(jì)數(shù)器 ,2 個(gè)全雙工串行通信口， 2個(gè)讀寫口線， AT89C52 可以按照常規(guī)方法進(jìn)行編程 ,但不可以在線編程 (S 系列的才支持在線編程 )。在 FLASH 編程和校驗(yàn)時(shí)， P1 口作為第八位地址接收。 P3 口： P3 口管腳是 8 個(gè)帶內(nèi)部上拉電阻的雙向 I/O 口，可接收輸出 4 個(gè) TTL 門電 4 流。因此它可用作對外部輸出的脈沖或用于定時(shí)目的。但在訪問外部數(shù)據(jù)存儲(chǔ)器時(shí)，這兩次有效的 /PSEN 信號(hào)將不出現(xiàn)。主要管腳有： XTAL1（ 19 腳）和 XTAL2（ 18 腳）為振蕩器輸入輸出端口，外接 12MHz 晶振。 C51 已被完全集成到 uVision2 的集成開發(fā)環(huán)境中，這個(gè)集成開發(fā)環(huán)境包含：編譯器，匯 編器，實(shí)時(shí)操作系統(tǒng)，項(xiàng)目管理器，調(diào)試器。雖然目前國內(nèi)推廣剛起步，但已受到單片機(jī)愛好者、從事單片機(jī)教學(xué)的教師、致力于單片機(jī)開發(fā)應(yīng)用的科技工作者的青睞。//LCD 第一行顯示 unsigned char code dis2[] = {shaowenjie}。 } } } bit lcd_bz() { bit result。 result = (bit)(P1 amp。 _nop_()。 _nop_()。 rw = 0。 _nop_()。 delay(1)。 while(1) { lcd_pos(0x01)。 while(dis2[i] != 39。 Proteus 是世界上著名的 EDA 工具 (仿真軟件 )，從原理圖布圖、代碼調(diào)試到單片機(jī)與外圍電路協(xié)同仿真，一鍵切換到 PCB 設(shè)計(jì)，真正實(shí)現(xiàn)了從概念到產(chǎn)品的完整設(shè)計(jì)。 D0~D7 為 8 位雙向數(shù)據(jù)線。每部分都獨(dú)立成為一個(gè)體系，各功能模塊外圍電路采用分立元件。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。s cultural foray overseas, has been widely panned by its home audience. Retitled Empresses in the Palace, the American version has been shortened from its original 76 episodes at 45 minutes each, to six 90minute episodes. The quick pacing threw off many native viewers, who are accustomed to a more leisurely daytimesoapstyle narrative rhythm. (Chinese TV stations would run two or three episodes every day.) I did not finish the fulllength version and found the truncated one not difficult to follow. What39。m nothing if not that! In his text he expounds on the idea that one must give their life a purpose. And that is the true topic of this entry. These last four years have been so easy: teach for a grand total of six hours a week, and the rest of my time is mine. Since I39。 he wondered how in the world he came to belong there. Indeed his penning and publishing this essay caused his exmunication from high society and also caused him a lot of legal trouble. The legal trouble came as a result of the fact that he was speaking out against the government. I like to reference such texts from time to time as an example both of the fact that history does repeat itself and that this world is not so big that what applies to one society does not in any way touch another society. On a much smaller scale,Emerson39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles