【正文】 SD4004 based on AT89C52 single chip puter and of the main parts of speech plate as the working principle of voice recording circuit and the design of hardware and software. ISD4004 series working voltage, monolithic 3V recording time 8 to 16 minutes, timbre, suitable for mobile phones and other portable electronics. Chip design is based on all the operation must by micro controller control, operation orders through serial munication interface SPI into. This paper summarizes the principle of voice recording circuit, and introduces the function of speech on the basis of recording system, puts forward the general structure of the system. Recording system for the recording, playback part of the overall design scheme is demonstrated. This paper introduces microcontroller AT89C52 single applications in system, the application system were analyzed each part of hardware and software realization.This design is to plete a reliable and stable working voice recording circuit. The design is simple in structure, reliable control and facilitate promotion. Keywords: ISD4004；89C52microcontroller；voice recording and playback目 錄引 言 .........................................................................................................................................1第 1章緒論 ..................................................................................................................................2 系統(tǒng)設計的意義 ....................................................................................................................2 系統(tǒng)設計的目的 ....................................................................................................................2 系統(tǒng)采用的實現(xiàn)方法 ...........................................................................................................3第 2章 單片機控制技術和開發(fā)環(huán)境介紹 ........................................................................4 89C52 單片機性能和引腳介紹 ...........................................................................................4 概述 ...............................................................................................................................4 AT89C52 主要性能參數(shù) ................................................................................................4 引腳功能說明 .................................................................................................................4 KEIL 開發(fā)環(huán)境和建立工程 ....................................................................................................8 keil 簡介 ..........................................................................................................................8 Keil 工程建立 .................................................................................................................8 ISD4004 介紹 .....................................................................................................................11 性能簡述和引腳圖 .......................................................................................................11 引腳描述 .......................................................................................................................11 SPI(串行外設接口) ..........................................................................................................13 協(xié)議介紹 .......................................................................................................................13 信息快進 ......................................................................................................................14 上電順序 .......................................................................................................................14 SPI 端口的控制位 ........................................................................................................15 SPI 控制寄存器 ............................................................................................................16 時序 ...............................................................................................................................16第 3章 系統(tǒng)總體設計 ...........................................................................................................18 硬件電路設計 ....................................................................................................................18I 硬件電路圖 ...................................................................................................................18 ISD4004 原理圖 ............................................................................................................18 軟件設計 .............................................................................................................................19 語音芯片的內部信息尋址機制 ...................................................................................19 監(jiān)控 ISD4004 錄音地址的實例 ...................................................................................20 程序流程圖 ............................................................................................