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READING

  • something is very important in life. So read it. Try READING it,. I do not care. Please read it/ Ple

    something is very important in life. So read it. Try READING it,. I do not care. Please read it/ Please or on it in I am on or

    标签: read something important it

    上传时间: 2013-12-26

    上传用户:hphh

  • executed program for temperature READING of cs5463

    executed program for temperature READING of cs5463

    标签: temperature executed program READING

    上传时间: 2013-12-09

    上传用户:zhyiroy

  • vhdl code for ALU.i think by READING his code..it will be very easy for you to design an Alu.

    vhdl code for ALU.i think by READING his code..it will be very easy for you to design an Alu.

    标签: code for READING design

    上传时间: 2013-12-27

    上传用户:wangzhen1990

  • READING CODE TESTER

    READING CODE TESTER

    标签: READING TESTER CODE

    上传时间: 2014-10-30

    上传用户:佳期如梦

  • c program to control cmx865 READING DTMF codes

    c program to control cmx865 READING DTMF codes

    标签: program control READING codes

    上传时间: 2014-07-08

    上传用户:离殇

  • READING gps data from serial

    READING gps data from serial

    标签: READING serial data from

    上传时间: 2013-12-25

    上传用户:xc216

  • A pdf regarding, READING of bar codes from mobile phones. All types of bar codes can be read from th

    A pdf regarding, READING of bar codes from mobile phones. All types of bar codes can be read from the mobile phones. It includes the details regarding, how to convert the bar codes into appropriate formats and then to verify it for the geniality.

    标签: codes from bar regarding

    上传时间: 2013-12-26

    上传用户:xinzhch

  • 基于ARM的多对象远程抄表系统集中器的设计与实现

    智能电表、水表、煤/燃气表、热量表等大量地出现在人们的生活中,同时这些仪表的抄录工作变得越来越烦琐,工作量大,工作效率低,不仅给用户带来不便,而且会存在漏抄、误抄、估抄的现象。随着电子技术、通信技术和计算机技术的飞速发展,人工抄表已经逐步被自动抄表所代替。 集中器是一个数据集中处理器,是多对象自动抄表系统的通信桥梁,负责对各智能表的数据进行采集、存储和管理,及时有效地向上位机传输数据并执行上位机发送的指令。提高多对象集中器数据处理能力,有效完成上下行通信是多对象自动抄表系统AMRS(Automation Meter READING System)目前需要解决的关键问题。 本文针对多对象集中器这样一个较复杂的通信与控制系统,提出采用32位的高性能嵌入式微处理器。32位ARM9微处理器处理速度快、硬件性能高、低功耗、低成本,集成了相当多的硬件资源,硬件的扩展和设计大大简化,ARM9(S3C2410)为工业级芯片,抗干扰能力强,能够适应运行现场的较恶劣环境,8/16位微控制器运算能力有限,对于较复杂的通信与控制算法难以顺利完成;硬件平台依赖性强,不利于软件的开发、升级与移植;在缺乏多任务调度机制的情况下,应用软件不仅实现难度大,且可靠性难以保证。 本文首先对多对象远程抄表系统的总体结构进行研究,主要研究了多对象远程抄表系统中集中器的软件和硬件实现,对硬件资源进行了外围扩展,对S3C2410微处理器芯片的外围硬件进行了扩展设计,使之具备了满足使用需求的最小系统硬件资源,包括时钟、复位、电源、外围存储、LCD、RS-485通信模块、CAN通信模块等电路设计。实时时钟为多对象集中器定时抄表提供时间标准;电源电路为多对象集中器系统提供稳定电源;看门狗电路的设计保证多对象集中器系统可靠运行,防止系统死机;数据存储器主要用于存储参数、变量、集中器自身的参数,负责智能表的参数以及智能表用量等。上行通道即多对象集中器与上位机之间的通信线路,采用CAN现场总线进行通信;下行通道即多对象集中器与智能表之间的通信,采用RS-485总线进行通信。软件设计上,主要针对多对象集中器的数据存储功能和串行通讯功能进行程序编写。基于ARM的多对象远程抄表系统集中器可以实现多对象远程抄表,提高了数据处理能力,有效完成了上下行通信,可靠性强,稳定性高,结构简单。

    标签: ARM 对象 远程抄表系统 集中器

    上传时间: 2013-06-07

    上传用户:heminhao

  • 提高在噪声环境下的磁卡读写器(MCR)系统

    Abstract: Most magnetic read head data sheets do not fully specify the frequency-dependent components andare often vague when specifying other key parameters. In some cases, the specifications of two very similarheads from two different manufacturers might be quite different in terms of parameters specified and omitted.The limitations in the data sheets make designing an optimum card READING system unnecessarily difficult andtime consuming. This document outlines a strategy to overcome the above shortcomings and offers guidelinesto overcome the noise issues.

    标签: MCR 噪声环境 磁卡读写器

    上传时间: 2013-11-13

    上传用户:dysyase

  • 射频集成电路设计John Rogers(Radio Freq

    Radio Frequency Integrated Circuit Design I enjoyed READING this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that microwave issues did not arise.As a consequence, they were adept at lumped parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in microwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and microwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that microwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.

    标签: Rogers Radio John Freq

    上传时间: 2014-12-23

    上传用户:han_zh