【正文】 chip puter adopts the flexible and accessible C language. The system bines the controlling flexibility of AT89C52 with programmable performance of FPGA , so it not only can shorten develop cycle ,but also has advantage of tightening architecture ,little volume ,high reliability ,wide scope and high precision . Key words: EDA technique； single chip puter； frequency meter； FPGA 內(nèi)蒙古科技大學畢業(yè)設(shè)計 說明書（畢業(yè) 論文 ） V 目 錄 摘 要 .......................................................................................................................................III Abstract..................................................................................................................................... IV 第一章 緒 論 .......................................................................................................................... 1 研究背景及意義 ......................................................................................................... 1 頻率計發(fā)展概況 ......................................................................................................... 1 論文所做的工作與研究內(nèi)容 ..................................................................................... 2 第二章 等精度數(shù)字頻率計測頻原理及設(shè)計方法 .................................................................. 4 等精度數(shù)字頻率計測頻原理 ..................................................................................... 4 常用測頻方法簡介 .......................................................................................... 4 等精度測頻原理 .............................................................................................. 4 等精度數(shù)字頻率計的設(shè)計方法 ................................................................................. 5 電子系統(tǒng)的傳統(tǒng)設(shè)計方法 .............................................................................. 5 當代電子系統(tǒng)的設(shè)計方法 .............................................................................. 6 第三章 主要芯片及設(shè)計工具簡介 .......................................................................................... 8 主要芯片介紹 ............................................................................................................. 8 AT89C52 單片 機性能簡介 ............................................................................... 8 FLEX10K 芯片系列簡介 ............................................................................... 11 MUX+PLUSⅡ概述 ................................................................................................... 14 VHDL 語言簡介 ........................................................................................................ 15 第四章 硬件電路設(shè)計 ............................................................................................................ 17 系統(tǒng)組成 ................................................................................................................... 17 內(nèi)蒙古科技大學畢業(yè)設(shè)計 說明書（畢業(yè) 論文 ） VI 鍵盤接口電路 ........................................................................................................... 17 顯示電路 ................................................................................................................... 18 測量電路 ................................................................................................................... 19 測量與自校驗選擇電路 ................................................................................ 21 測頻原理與測頻電路 .................................................................................... 22 脈寬控制電路 ................................................................................................ 24 硬件電路的 VHDL 語言描述 .................................................................................. 25 D 觸發(fā)器 ......................................................................................................... 25 32 位計數(shù)器 .................................................................................................... 26 MUX648 多路選擇器 .................................................................................... 27 MUX21 選擇器 .............................................................................................. 28 時鐘發(fā)生器 .................................................................................................... 28 64 位移位寄存器 ............................................................................................ 29 數(shù)碼管字 型譯碼器 ........................................................................................ 30 數(shù)碼管片選譯碼器 ........................................................................................ 31 鍵盤編碼器 .................................................................................................... 32 單片機主控電路 .......................................................................................... 33 第五章 軟件電路設(shè)計 ............................................................................................................ 34 主程序 ....................................................................................................................... 34 復位自檢程序 ........................................................................................................... 35 數(shù)據(jù)輸出程序 ........................................................................................................... 36 頻率測量程序 ........................................................................................................... 37 數(shù)據(jù)讀入程序 ........................................................................................................... 37 內(nèi)蒙古科技大學畢業(yè)設(shè)計 說明書（畢業(yè) 論文 ） VII 占空比測量控制程序 ............................................................................................... 37 鍵值讀取程序 ........................................................................................................... 38 數(shù)制轉(zhuǎn)換程序 ........................................................................................................... 39 第六章 系統(tǒng)性 能分析 ...........................................