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  • 单片机系统“PC”失控的软件措施

    单片机系统“PC”失控的软件措施Software Measure of GettingO uto fC ontrolfo r“PC"in S ingleC hipC omputerS ystem谧 加 春 王 晓 基 雷 小 华(江 西 理 工 大 学机 电 工 程 学 院 ,赣 州 34 10 00)摘要单片机系统在实际工业现场中可能遇到各种干扰和自身的随机性故障。现场恶劣的环境有可能使计算机系统发生异常,计算机程序指针“PC”失控就是常见的故障之一,如果发生“PC”失控,将导致CPI工作混乱,酿成严重的事故。研究了“PC”失控的原因,并指出软件抗干扰的几种方法,有效保证单片机系统的正常工作。关键词单片机“PC”失控抗干扰Abstract Inp racticalin dustrialfi elds,th ereis v ariousin terferencea fectingo perationo fsi nglec hipc omputersy stemsa ndt hec omputersy stems。fac吨random faults饰themselves. It is very common that the severe environment makes the computer systems abnormal. The program counter "PC"gettingo utof co ntorlis on eo fth ec ommonfa ults.If th isoc curs,C PUw ouldb eru nningo utof or deran din torducesse riousan cient.T hec ausesof " PC"geting out of control, studied in this paper and some countermeasures of anti-interference师software are given to ensure single chip computer systemworking properly.Keywords Single。饰computer Porgramc ounter"P C" Anti-interfeernc 在设 计 和 开发单片机系统时,一般难以周全地预计单片机系统在实际工业现场中可能遇到的各种干扰和自身的随机性故障。因此,除了采取防止和抑制干扰的各项措施外,还应该借助于软件措施克服某些干扰,系统还应具备迅速自行恢复的能力。本文介绍的应对单片机系统PC失控的软件措施,设计灵活,节省硬件资源,能保证测控系统长期可靠地运行。MC S- 5 1单片机以其优良的性能价格比大量应用于工业现场测试和控制领域。但是,现场恶劣的环境有可能使计算机系统发生异常,计算机程序指针PC失控就是常见的故障之一,一旦发生PC“走飞”,计算机系统就会出现工作混乱,酿成严重的事故。为 了 在 CP 失控时尽量减少由此带来的不利影响,并尽快使系统恢复正常,需要采取一定的软件措施和硬件措施。常见的硬件措施有“看门狗”电路。软件措施设置的前提条件是:①在干扰作用下,微机系统硬件部分不会受到任何损坏,或者损坏部分设置有监测状态可供查询;②程序区不会受到干扰侵害。单片机系统的程序和表格以及重要的参数均设置在ROM区,不会因干扰的侵人而改变;③ RAM区中的重要数据不会被破坏,或者虽然被破坏,但是可以重新建立。

    标签: 单片机系统 软件

    上传时间: 2013-11-02

    上传用户:bhqrd30

  • 基于混合扩频的导航卫星抗干扰技术

     随着卫星导航系统在军事上的广泛应用,研究导航系统的抗干扰技术已经成为当务之急。文中创新的将跳时技术与现有导航系统相结合,提出基于直扩/跳时(DS/TH)混合扩频的导航卫星系统方案。并分别在4种卫星导航干扰模式下,对此方案进行了抗干扰性能仿真及分析。结果表明在信噪比为-33 dB误码率为10-4时,该方案抗干扰性能比传统导航信号至少提高17 dB,尤其对于抗脉冲干扰,其性能可以改善20 dB左右。

    标签: 混合扩频 导航卫星 抗干扰技术

    上传时间: 2013-11-23

    上传用户:GeekyGeek

  • 常规风华中高压产品承认书

    电容器及介质种类: ※高频类: 此类介质材料的电容器为Ⅰ类电容器,包括通用型高频COG、COH电容器和温度补偿型高频HG、LG、PH、RH、SH、TH、UJ、SL电容器。其中COG、COH电容器电性能最稳定,几乎不随温度、电压和时间的变化而变化,适用于低损耗,稳定性要求高的高频电路,HG、LG、PH、RH、SH、TH、UJ、SL电容器容量随温度变化而相应变化,适用于低损耗、温度补偿型电路中。 ※ X7R、X5R:此类介质材料的电容器为Ⅱ类电容器,具有较高的介电常数,容量比Ⅰ类电容器高,具有较稳定的温度特性,适用于容量范围广,稳定性要求不高的电路中,如隔直、耦合、旁路、鉴频等电路中。 ※Y5V:此类介质材料的电容器为Ⅱ类电容器,是所有电容器中介电常数最大的电容器,但其容量稳定性较差,对温度、电压等条件较敏感,适用于要求大容量,温度变化不大的电路中。 ※Z5U:此类介质材料的电容器为Ⅱ类电容器,其温度特性介于X7R和Y5V之间,容量稳定性较差,对温度、电压等条件较敏感,适用于要求大容量,使用温度范围接近于室温的旁路,耦合等,低直流偏压的电路中。

    标签: 风华 产品承认书

    上传时间: 2013-11-05

    上传用户:后时代明明

  • CopyPwd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even th

    CopyPwd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Usage of CopyPwd is at the risk of the person or company using this software

    标签: distributed WARRANTY CopyPwd WITHOUT

    上传时间: 2013-12-09

    上传用户:sjyy1001

  • This directory contains utility for implementing generic Reqursive Least Squares (RLS) algorithm. Th

    This directory contains utility for implementing generic Reqursive Least Squares (RLS) algorithm. The example shows how one can use the utility to estamate the parameters of a simple linear discrete time system.

    标签: implementing Reqursive directory algorithm

    上传时间: 2014-01-06

    上传用户:gtf1207

  • This driver was developed using a USB keyboard from Cherry,as indicated by the VID and PID codes. Th

    This driver was developed using a USB keyboard from Cherry,as indicated by the VID and PID codes. These IDs must be set for the device you intend to support. Similarly, you will need to set Class to the appropriate string for your device class.

    标签: developed indicated keyboard Cherry

    上传时间: 2015-04-02

    上传用户:nanxia

  • The cart with an inverted pendulum, shown below, is "bumped" with an impulse force, F. Determine th

    The cart with an inverted pendulum, shown below, is "bumped" with an impulse force, F. Determine the dynamic equations of motion for the system, and lin earize about the pendulum s angle, theta = Pi (in other words, assume that p endulum does not move more than a few degrees away from the vertical, chosen to be at an angle of Pi). Find a controller to satisfy all of the design re quirements given below.

    标签: F. with Determine inverted

    上传时间: 2014-01-17

    上传用户:miaochun888

  • Delineate is a tool for converting bitmap raster images to SVG (Scalable Vector Graphics) using Auto

    Delineate is a tool for converting bitmap raster images to SVG (Scalable Vector Graphics) using AutoTrace or potrace. It displays SVG results using Apache Batik. Input formats are JPEG, PNG, GIF, BMP, TIFF, PNM, PBM, PGM, PPM, IFF,PCD, PSD, RAS.

    标签: converting Delineate Graphics Scalable

    上传时间: 2014-01-19

    上传用户:四只眼

  • The C# program will solve the Tower of Hanoi for a given number of rings/disks/plates and display th

    The C# program will solve the Tower of Hanoi for a given number of rings/disks/plates and display the ring/disk/plate movement. The movement will be shown graphically

    标签: program display number plates

    上传时间: 2013-12-20

    上传用户:1966640071

  • Client/server communication, automated telnet sessions, wake on lan, winsock communications using th

    Client/server communication, automated telnet sessions, wake on lan, winsock communications using this easy to use component

    标签: communications communication automated sessions

    上传时间: 2015-06-10

    上传用户:钓鳌牧马