毕业设计 基于单片机与FPGA的等精度频率计的设计.doc

基于单片机与FPGA的等精度频率计的设计
---------单片机部分
摘要
本设计课题为基于单片机与FPGA的等精度频率计的设计。本设计以AT89C51单片机作为系统的主控部件,实现整个电路的信号控制、数据运算处理等功能;一片现场可编程逻辑器件FPGA芯片FLEX EPF10K20RC208-4完成各种时序逻辑控制、计数功能。
本文详细论述了等精度数字频率计的测频原理、硬件电路的组成、设计和单片机软件编程设计、系统的误差分析。其中硬件电路包括键盘控制模块、显示模块和测量模块,键盘模块采用独立式的键盘,实现了测频功能,还实现了周期、脉宽、占空比测量等功能的选择;显示模块采用静态显示方式,因此电路结构简单,显示方便;AT89C51单片机的软件编程采用灵活易读的C语言。本设计将AT89C51单片机的控制灵活性和FPGA芯片的现场可编程性相结合,不但大大缩短了开发研制周期,而且使本系统具有结构紧凑、体积小、可靠性高、测频范围宽、精度高等优点。
关键词:EDA技术;单片机;频率计;FPGA
Based on the MCU and FPGA such as the frequency accuracy of design
---- SCM part
Abstract
The design issues for the frequency of such as the frequency accuracy of design which based on the MCU and FPGA. In the design AT89C51 as a ponent, completed the whole circuit’ s signal control, the data processing functions and so on; a field programmable logic device FPGA and chip FLEX EPF10K20RC208-pleted logic controling and counting function.
This paper discusses in detail the accuracy of the figures such as the frequency in frequency measurement principle, hardware ponents, design and microcontroller software design. Circuit includes hardware keyboard control module, module and measurement module keyboard module of six keys choice, it not pletes the functional test frequency but pletes the cycle, pulse width, duty cycle measurement function of choice; Module static display mode made the circuit simple, and convention to show; AT89C51 flexible software programming in C language accessibility. The design binated AT89C51 control flexibility and FPGA Field Programmable Phase not only greatly shortens the development cycle time, but also makes the system have the advantages pact, small size, high reliability, Measuring frequency range, the higher precision.
Key words: EDA technology; Microcontroller; Cymometer; FPGA
目录
摘要 I
Abstract II
第一章引言 1
研究背景与意义 1
频率计的发展概况 1
论文所做的工作与研究内容 2
第二章等精度数字频率计测频原理与设计方法 4
等精度数字频率计测频原理 4
数字频率计的测频方法简介 4
等精度测频原理 5
等精度数字频率计的设计方法 7
电子系统的设计方法 7
第三章主要