【正文】 點(diǎn)陣顯示屏包括驅(qū)動(dòng)電路和顯示屏， 74LS138 譯碼器輸出控制顯示屏的行掃描， 74HC595（八位并行輸出移位寄存器）控制顯示屏的列，由于人眼視覺的滯留現(xiàn)象，行列驅(qū)動(dòng)電路通過動(dòng)態(tài)控制便實(shí)現(xiàn)了漢字的顯示。 The main chip of the control part is STC89C52RC,it is the core of the system, and then downloaded the C programming language to MCU to control its pins。 drive circuit of display screen 目 錄 1 引言 ................................................................................................................................ 1 課題背景 ............................................................................................................... 1 系統(tǒng)功能概述 ....................................................................................................... 1 總體設(shè)計(jì)框架 ............................................................................................. 1 上位機(jī) (PC) .................................................................................................. 2 串行通信接收器 ......................................................................................... 2 單片機(jī) ......................................................................................................... 3 外擴(kuò)存儲器 ................................................................................................. 3 LED 顯示屏行列驅(qū)動(dòng)電路 ......................................................................... 3 LED 點(diǎn)陣顯示屏 ......................................................................................... 3 2 Proteus 模擬仿真 ............................................................................................................ 4 Proteus 介紹 .......................................................................................................... 4 Keil u Vision3 介紹 ............................................................................................... 5 Keil u Vision3 與 Proteus 的連接 ......................................................................... 6 硬件仿真電路 ....................................................................................................... 6 下位機(jī)漢字顯示的仿真 ............................................................................. 6 EEPROM 外擴(kuò)存儲器讀寫的仿真 ............................................................ 7 下位機(jī)接收上位機(jī)傳輸數(shù)據(jù)的仿真 ......................................................... 7 調(diào)試過程 ............................................................................................................... 9 3 硬件部分 ...................................................................................................................... 12 單片機(jī)簡介 ......................................................................................................... 12 單片機(jī)的發(fā)展及應(yīng)用 ............................................................................... 12 單片機(jī)的應(yīng)用 ........................................................................................... 13 單片機(jī)的開發(fā)平臺 ................................................................................... 13 控制部分 ............................................................................................................. 14 芯片簡介 ................................................................................................... 14 硬件電路 ................................................................................................... 18 電路說明 ................................................................................................... 19 調(diào)試過程 ................................................................................................... 19 顯示屏部分 ......................................................................................................... 19 芯片簡介 ................................................................................................... 19 硬件電路 ................................................................................................... 25 電路說明 ................................................................................................... 25 調(diào)試過程 ................................................................................................... 26 設(shè)計(jì)硬件電路過程總結(jié) ..................................................................................... 26 仿真階段 ................................................................................................... 26 實(shí)物階段 ................................................................................................... 28 4 軟件部分 ...................................................................................................................... 29 匯編語言與 C 語言 ............................................................................................. 29 C 語言的突出優(yōu)點(diǎn) .............................................................................................. 30 漢字顯示的原理 ................................................................................................. 30 漢字點(diǎn)陣碼的生成 ............................................................................................. 31 程序設(shè)計(jì)流程 ..................................................................................................... 33 靜態(tài)顯示漢字信息 ................................................................................... 35 動(dòng)態(tài)顯示漢字信息 ................................................................................... 36 EEPROM 外擴(kuò)存儲器的讀寫 .................................................................. 36 下位機(jī)接收上位機(jī)發(fā)送的數(shù)據(jù) ............................................................... 37 外部中斷的測試 ....................................................................................... 37 總程序 ....................................................................................................... 37 5 VB（上位機(jī)） .............................................................................................................. 39 VB 軟件簡介 ......................................................................................................