【正文】 tment which the call is to, then the call is transferred to the department. Because the outside call is not pay by the pany, the pany need not limit the call. When the workers of the pany call the outside, the munication cost is pay by the pany. In order to limit the workers using pany phone to call the not relative numbers, the pany should set limits of authority to discriminate the white numbers from the white numbers. This project mainly use the microcontroller to control the inside call which is to the outside. The microcontroller discriminate the white numbers from the black numbers . AT89C51 is CPU of this system, and it is core of this system. This system uses 74LS373, 74LS138, 7404, DAC0832 to discriminate the white numbers from the black numbers. Software of this system is programmed by assembler language and it is mainly posed by main program, subprogram of generation of the inside phone number , subprogram of discriminating the white numbers from the black numbers, subprogram of digital to analog converting and outputting of the phone number. After designing hardware of the system and programming the software, the system is simulating and debugging online. Wellgoing of the system verifies correctness in the design. In the end, circuit schematic diagram is drawn by Protel 99SE. Keywords intelligent phone； microcontroller； phone number controlling i 目 錄 摘 要 ............................................................................................................. I Abstract ...................................................................................................... II 第 1章 緒 論 ............................................................................................ 1 課題背景 .......................................................................................... 1 課題來源 .......................................................................................... 2 本論 文的工作和特點(diǎn) ...................................................................... 2 本章小結(jié) .......................................................................................... 3 第 2章 MCS51 單片機(jī)的結(jié)構(gòu) ................................................................. 4 控制器 .............................................................................................. 4 程序計數(shù)器 .............................................................................. 4 指令控制邏輯電路 .................................................................. 5 存儲器的結(jié)構(gòu) .................................................................................. 5 并行 I/O 口 ...................................................................................... 7 時鐘電路與時序 .............................................................................. 8 單片機(jī)的中斷 .................................................................................. 9 單片機(jī)的工作方式 ........................................................................ 12 單片機(jī)的性能特點(diǎn) ........................................................................ 15 單片機(jī)的應(yīng)用領(lǐng)域 ........................................................................ 16 本章小結(jié) ........................................................................................ 17 第 3 章 電路的硬件設(shè)計 .......................................................................... 18 總體方案設(shè)計 ................................................................................ 18 系統(tǒng)總體框圖 ........................................................................ 18 去電信號的產(chǎn)生 .................................................................... 18 復(fù)位電路 ........................................................................................ 19 時鐘電路 ........................................................................................ 20 按鍵電路 ........................................................................................ 21 ii 模數(shù)轉(zhuǎn)換及去電輸出電路 ............................................................ 22 本章小結(jié) ........................................................................................ 23 第 4 章 電路的軟件設(shè)計 .......................................................................... 24 軟件程序內(nèi)容 ................................................................................ 24 軟件總體流程圖 ............................................................................ 25 去電信號產(chǎn)生子程序 .................................................................... 26 黑白名單區(qū)分子程序 .................................................................... 27 模數(shù)轉(zhuǎn)換及去電輸出子程序 ........................................................ 28 本章小結(jié) ........................................................................................ 29 第 5章 電路調(diào)試與仿真 .......................................................................... 30 硬件焊接 ........................................................................................ 30 調(diào)試 ................................................................................................ 30 硬件調(diào)試方法 ........................................................................ 31 軟件調(diào)試方法 ........................................................................ 32 仿真中出現(xiàn)的問題及解決辦法 .................................................... 32 本章小結(jié) ........................................................................................ 33 結(jié) 論 .................................................................................................... 34 參考文獻(xiàn) .................................................................................................... 35 附錄 ............................................................................................................ 36 致謝 ............................................................................................................ 45 畢業(yè)設(shè)計（論文）評審意見表 ...............................