提出一種基于單片機AT89C51SND1C的MP3播放系統的設計方案。單片機集成了專用的解碼器,使用K9F1208閃存作為外存儲器,放音電路采用CS4330,存儲文件通過播放器上的USB接口設備從PC機上直接下載,液晶顯示采用LCD1602。方案設計簡單,性價比高,低功耗,易擴展。由于采用的是通用單片機實現的,可以很容易地移植到其他微控制器系統中,有很強的市場競爭能力和實用價值。 Abstract: A MP3 player design based on microchip AT89C51SND1C was presented, which used K9F1208 Flash chip as the memory circuit and used CS4330 as play chip. Storage files were download from PC through USB interfaces player on the device,and the LCD/602 was used as display screen. This system had characteristics of simple design,low power,easy expand,low cost and high recognition. Using of universual microchip make it easy to transplant to other microcontrol system,and have strong market competitiom and practical value.
上傳時間: 2014-12-27
上傳用戶:佳期如夢
為了在工業生產及過程控制中準確測量溫度,設計了一種基于低功耗MSP430單片機的數字溫度計。整個系統通過單片機MSP430F1121A控制DS18B20讀取溫度,采用數碼管顯示,溫度傳感器DS18B20與單片機之間通過串口進行數據傳輸。MSP430系列單片機具有超低功耗,且外圍的整合性高,DS18B20只需一個端口即可實現數據通信,連接方便。通過多次實驗證明,該系統的測試結果與實際環境溫度一致,除了具有接口電路簡單、測量精度高、誤差小、可靠性高等特點外,其低成本、低功耗的特點使其擁有更廣闊的應用前景。 Abstract: In order to obtain accurate measuring temperature in industrial production and process control, a digital thermometer based on MSP430 MCU is designed. The system uses MSP430F1121A MCU to control DS18B20, and gets the temperature data, which is displayed on the LED. The temperature sensor DS18B20 and MCU transmit data through serial communication. MSP430 series has ultra-low power and high integration, DS18B20 only needs one port to achieve data communication. Through many experimental results prove, this system is consistent with actual environment temperature. The system has characteristics of interface circuit simple, high measuring accuracy, minor error, high reliability, besides, the characteristics of low cost and low power make it having vaster application prospect.
上傳時間: 2013-10-16
上傳用戶:wettetw
Bootloader是微處理器上電時運行的第一段代碼,它可以通過通信接口實現對微處理器內部應用程序的更新升級,為網絡化嵌入式產品的應用程序升級帶來極大的便利。由于目前沒有統一嵌入式系統的Bootloader。基于NEC 78K0系列單片機自編程原理,設計出一個適用于78K0/Fx2系列單片機的Bootloader,并能夠通過單片機串口在線升級應用程序。 Abstract: Bootloader is the first piece of code executed after microprocessor startup. It makes the embedded product’s firmware update conveniently through communication interface. However, no unified bootloader is available for all kinds of microprocessor products. Based on the principle of self-programming NEC 78K0s’ series, a useful Bootloader which is suitable for 78K0/Fx2s’ series MCU is designed,the design can update the application through serial ports.
標簽: Bootloader MCU 自編程
上傳時間: 2013-10-26
上傳用戶:fang2010
本文介紹了基于AT89C52 單片機的自動水溫控制系統的設計及實現過程。該系統具有實時顯示、溫度測量、溫度設定并能根據設定值對環境溫度進行調節實現控溫的目的以及達到上下限溫度報警功能,控制算法是基于數字PID 算法。關鍵詞 :PID AT89C52 脈寬調制 實時 Abstract : This article describes AT89C52 single-chip microcomputer-basedautomatic water temperature control system design and implementation process. Thesystem has real-time display, temperature measurement, temperature settings and theenvironment in accordance with the temperature settings adjusted to achieve thepurpose of temperature control and reach the upper and lower limits of temperaturealarm function, the control algorithm is based on the digital PID algorithm.Keyword: PID AT89C52 PWM real time
上傳時間: 2013-10-10
上傳用戶:歸海惜雪
基于AT89C52單片機的步進電機控制系統設計 摘 要: 提出了一個由AT89C52單片機控制步進電機的實例。可以通過鍵盤輸入相關數據, 并根據需要, 實時對步進電機工作方式進行設置, 具有實時性和交互性的特點。該系統可應用于步進電機控制的大多數場合。實踐表明, 系統性能優于傳統的步進電機控制器。 關鍵詞: 單片機; 步進電動機; 直流固態繼電器; 實時控制 ABSTRACT: A stepp ing motor control system based on AT89C52 chip microcomputer was described.The data can be inputwith keyboard, and stepp ingmotorwas controlled by these data. According to the demand, users can set the workingmodel of stepp ingmotor in real2time. This system can be widely used in stepp ing motor controlling. The p ractice showed that the performance of this system outdid the tradi-tional stepp ing motor controller.
上傳時間: 2013-11-22
上傳用戶:vodssv
C8051F單片機 C8051F系列單片機 單片機自20世紀70年代末誕生至今,經歷了單片微型計算機SCM、微控制器MCU及片上系統SoC三大階段,前兩個階段分別以MCS-51和80C51為代表。隨著在嵌入式領域中對單片機的性能和功能要求越來越高,以往的單片機無論是運行速度還是系統集成度等多方面都不能滿足新的設計需要,這時Silicon Labs 公司推出了C8051F系列單片機,成為SoC的典型代表。 C8051F具有上手快(全兼容8051指令集)、研發快(開發工具易用,可縮短研發周期)和見效快(調試手段靈活)的特點,其性能優勢具體體現在以下方面: 基于增強的CIP-51內核,其指令集與MCS-51完全兼容,具有標準8051的組織架構,可以使用標準的803x/805x匯編器和編譯器進行軟件開發。CIP-51采用流水線結構,70%的的指令執行時間為1或2個系統時鐘周期,是標準8051指令執行速度的12倍;其峰值執行速度可達100MIPS(C8051F120等),是目前世界上速度最快的8位單片機。 增加了中斷源。標準的8051只有7個中斷源Silicon Labs 公司 C8051F系列單片機擴展了中斷處理這對于時實多任務系統的處理是很重要的擴展的中斷系統向CIP-51提供22個中斷源允許大量的模擬和數字外設中斷一個中斷處理需要較少的CPU干預卻有更高的執行效率。 集成了豐富的模擬資源,絕大部分的C8051F系列單片機都集成了單個或兩個ADC,在片內模擬開關的作用下可實現對多路模擬信號的采集轉換;片內ADC的采樣精度最高可達24bit,采樣速率最高可達500ksps,部分型號還集成了單個或兩個獨立的高分辨率DAC,可滿足絕大多數混合信號系統的應用并實現與模擬電子系統的無縫接口;片內溫度傳感器則可以迅速而精確的監測環境溫度并通過程序作出相應處理,提高了系統運行的可靠性。 集成了豐富的外部設備接口。具有兩路UART和最多可達5個定時器及6個PCA模塊,此外還根據不同的需要集成了SMBus、SPI、USB、CAN、LIN等接口,以及RTC部件。外設接口在不使用時可以分別禁止以降低系統功耗。與其他類型的單片機實現相同的功能需要多個芯片的組合才能完成相比,C8051單片機不僅減少了系統成本,更大大降低了功耗。 增強了在信號處理方面的性能,部分型號具有16x16 MAC以及DMA功能,可對所采集信號進行實時有效的算法處理并提高了數據傳送能力。 具有獨立的片內時鐘源(精度最高可達0.5%),設計人員既可選擇外接時鐘,也可直接應用片內時鐘,同時可以在內外時鐘源之間自如切換。片內時鐘源降低了系統設計的復雜度,提高了系統可靠性,而時鐘切換功能則有利于系統整體功耗的降低。 提供空閑模式及停機模式等多種電源管理方式來降低系統功耗 實現了I/O從固定方式到交叉開關配置。固定方式的I/O端口,既占用引腳多,配置又不夠靈活。在C8051F中,則采用開關網絡以硬件方式實現I/O端口的靈活配置,外設電路單元通過相應的配置寄存器控制的交叉開關配置到所選擇的端口上。 復位方式多樣化,C8051F把80C51單一的外部復位發展成多源復位,提供了上電復位、掉電復位、外部引腳復位、軟件復位、時鐘檢測復位、比較器0復位、WDT復位和引腳配置復位。眾多的復位源為保障系統的安全、操作的靈活性以及零功耗系統設計帶來極大的好處。 從傳統的仿真調試到基于JTAG接口的在系統調試。C8051F在8位單片機中率先配置了標準的JTAG接口(IEEE1149.1)。C8051F的JTAG接口不僅支持Flash ROM的讀/寫操作及非侵入式在系統調試,它的JTAG邏輯還為在系統測試提供邊界掃描功能。通過邊界寄存器的編程控制,可對所有器件引腳、SFR總線和I/O口弱上拉功能實現觀察和控制。 C8051F系列單片機型號齊全,可根據設計需求選擇不同規模和帶有特定外設接口的型號,提供從多達100個引腳的高性能單片機到最小3mmX3mm的封裝,滿足不同設計的需要。 基于上述特點,Silicon Labs 公司C8051F系列單片機作為SoC芯片的杰出代表能夠滿足絕大部分場合的復雜功能要求,并在嵌入式領域的各個場合都得到了廣泛的應用:在工業控制領域,其豐富的模擬資源可用于工業現場多種物理量的監測、分析及控制和顯示;在便攜式儀器領域,其低功耗和強大的外設接口也非常適合各種信號的采集、存儲和傳輸;此外,新型的C8051F5xx系列單片機也在汽車電子行業中嶄露頭角。正是這些優勢,使得C8051單片機在進入中國市場的短短幾年內就迅速風靡,相信隨著新型號的不斷推出以及推廣力度的不斷加大,C8051系列單片機將迎來日益廣闊的發展空間,成為嵌入式領域的時代寵兒 此系列單片機完全兼容MCS-51指令集,容易上手,開發周期短,大大節約了開發成本。C8051F系統集成度高,總線時鐘可達25M
上傳時間: 2013-11-24
上傳用戶:testAPP
The LPC1769/68/67/66/65/64 are ARM Cortex-M3 based microcontrollers for embedded applications featuring a high level of integration and low power consumption. The ARM Cortex-M3 is a next generation core that offers system enhancements such as enhanced debug features and a higher level of support block integration.
上傳時間: 2014-02-20
上傳用戶:13215175592
MC9S08QG8英文資料 The MC9S08QG8 is the newest member of the Freescale 8-bit family of highly integratedmicrocontrollers, based on the high-performance yet low power HCS08 core. The MC9S08QG8is an excellent solution for power-sensitive applications with extended battery life and maximum performance down to 1.8VDC.
上傳時間: 2014-12-28
上傳用戶:dxxx
本文介紹了一種基于單片機的健身車轉速測量系統。該系統具有電路簡單、使用方便等特點。文中詳細介紹了該系統的工作原理,并且給出了它的硬件原理圖和軟件設計程序框圖。關鍵詞:轉速 單片機 測量ABSTRACT :This paper introduces a measuring system of the rotational velocity of exercise bike based on single - chip microcomputer . It has such advantages : simple circuit ,convenient use and so on. The work principle is presented in detail in this paper and the block diagram of hardware and program flow chart are giv2 en as well .KEYWORDS :Rotational velocity Single - chip microcomputer Measuring
上傳時間: 2013-11-02
上傳用戶:源弋弋
匯編器在微處理器的驗證和應用中舉足輕重,如何設計通用的匯編器一直是研究的熱點之一。本文提出了一種開放式的匯編器系統設計思想,在匯編語言與機器語言間插入中間代碼CMDL(code mapping description language)語言,打破匯編語言與機器語言的直接映射關系,由此建立起一套描述匯編語言與機器語言的開放式映射體系。基于此開放式映射體系開發了一套匯編器系統,具有較高層次上的通用性和可移植性。【關鍵詞】指令集,CMDL,匯編器,開放式 Design of Retargetable Assembler System Liu Ling Feng Wen Nan Wang Ying Chun Jiang An Ping Ji Li Jiu IME of Peking University, 100871【摘要】An assembler plays a very important role in the field of microprocessor verifications and applications, thus how to build a retargetable assembler system has been a hotspot in this field for long time. This paper presents a new method about the retargetable assembler system design.It provides a kind of language CMDL, code mapping description language. During the process of assembling, assembler languages are firstly translated to CMDL, and then mapped to the machine codes. In an other word, CMDL is inserted between assembler languages and machine codes during the translation procedure. As a medium code, CMDL has a lot of features, such as high extraction, strong descript capabilities. It can describe almost all attributes of assembler languages. By breaking the direct mapping relationship between assembler languages and machine codes, the complexities of machine codes are hided to the users, therefore, the new retargetable assembler system has higher retargetable level by converting the mapping from assembler languages and machine codes to assembler languages and CMDL, and implementationof it becomes easier. Based on the new mapping system structure, a retargetable assemblersystem is developed. It proved the whole system has good retargetability and implantability.【關鍵詞】instruction set, symbol table, assembler, lexical analysis, retargetability
上傳時間: 2013-10-10
上傳用戶:meiguiweishi