【正文】 troller design and Clanguage programming microcontrollers,resources and all of its chip i/0 port functions and basic use of the the KEIL, PROTUES and the mon use of LCD displays and general use of the keyboard Keywords AT89C51 LCD control buttons 3 引言 當(dāng)今社會，隨著人們物質(zhì)生活的不斷提高，電子產(chǎn)品已經(jīng)走進了家家戶戶，無論是生活或?qū)W習(xí)，還是娛樂和消遣，幾乎樣樣都離不開電子產(chǎn)品，大型復(fù)雜的計算能力是人腦所不能勝任的，而且比較容易出錯。 計算器在人們的日常生活中是比較常見的電子產(chǎn)品之一，基于這樣的理念，本次設(shè)計是用 AT89C52 單片機， LCD 顯示 器，控制按鍵為元件來設(shè)計的具備基本功能的簡易計算器，利用此設(shè)計熟悉單片機微控制 器及 C 語言編程，對其片資源及各個 I/O 端口的動能和基本用途的了解，掌握 keil， protues 等開發(fā)軟件，以及常用的 LCD 顯示器的使用方法和一般簡單 的使用方法。 I 目 錄 摘 要 .......................................................................................................................................... 1 Abstract....................................................................................................................................... 2 引言 ............................................................................................................................................ 3 1 緒論 ........................................................................................................................................ 4 系統(tǒng)開發(fā)的背景 ........................................................................................................... 4 系統(tǒng)的開發(fā)意義 ........................................................................................................... 4 設(shè)計內(nèi)容和章節(jié) 分配 .................................................................................................. 4 2 系統(tǒng)方案設(shè)計 ........................................................................................................................ 5 功能介紹 ...................................................................................................................... 5 基本功能 ............................................................................................................ 5 擴展功能 ............................................................................................................. 5 方案論證與比較 .......................................................................................................... 5 控制部分的設(shè)計方案論證與選擇 .................................................................... 5 顯示電路的設(shè)計方案論證與選擇 ..................................................................... 6 鍵盤設(shè)計方案的選擇 ......................................................................................... 7 系統(tǒng)的組成 ................................................................................................................... 7 總體設(shè)計思想 ............................................................................................................... 8 3 主要芯片的介紹 ..................................................................................................................... 9 AT89C51 選擇及介紹 ................................................................................................... 9 開發(fā)工具的介紹 ： .................................................................................................... 10 4 硬件電路設(shè)計 ....................................................................................................................... 11 時鐘電路 .................................................................................................................... 11 顯示電路 ..................................................................................................................... 11 按鍵電路 .................................................................................................................... 12 5 軟件設(shè)計 ............................................................................................................................... 13 LCD1602 ..................................................................................................................... 13 LCD1602 字符發(fā)生存儲器（ CGROM） ........................................................ 13 顯示數(shù)據(jù)寄存器（ DDRAM） ........................................................ 14 計算器軟件設(shè)計 ........................................................................................................ 15 系統(tǒng)總流程圖 .................................................................................................. 16 II 算術(shù)運算程序設(shè)計 ........................................................................................... 16 數(shù)值的組成 ....................................................................................................... 18 LCD 的顯示方式 .............................................................................................. 19 仿真和調(diào)試 ................................................................................................................. 22 Keil 調(diào)試 .......................................................................................................... 22 protues 對于本設(shè)計的仿真 .............................................................................. 24 結(jié)論 .......................................................................................................................................... 25 致謝 .......................................................................................................................................... 26 參考文獻 .................................................................................................................................. 27 附錄（源代碼） ....