PIC单片机与PC机的串行数据交换

介绍PIC系列单片机中带串行通讯模块SCI的芯片与PC机串行数据交换的实现方法,其列举芯片为目前应用较广的PIC16F877,在介绍编程实现方法的同时,给出其硬件接口电路及通信源程序。     

超声波定位系统串行通信模块设计

针对超声波定位系统,设计了串行通信模块。介绍模块的工作流程和硬件电路,以及应用SP Comm控件在Delphi环境下开发的上位机软件。模块实现了PIC单片机与上位机的通信功能,并能够通过上位机软件对采集到的数据进行处理与显示。实验表明,该模块结构简单．性能稳定,在多机器鱼系统得到了应用。     

为任一PIC单片机实现主从多机通信的方法

介绍一种通过软件编程让任一PIC单片机实现主从串行多机通信的方法,为那些无串行硬件接口模块的PIC单片机增加多机通信功能。给出了详细设计思想和具体的软件的实现。     

计算机技术在通信控制模块中的应用

介绍了一种基于SPI（同步串行传输规范）的双机通信模块设计方法。该模块采用了两片PICF877A单片机,实现了双机主从串行通信的功能。同时简要阐述了该系统的设计思路,并给出了具体的实现方法。     

通信速率可调的单片机多机通信系统研究

在由单片机构成的多机应用系统中,单片机串行通信起着重要的作用。在单片机串行通信系统设计时,在不同环境条件下,单片机通信速率要求是有所不同的,双方通信速率的设定十分重要。研究一种在单片机通信系统中,在不增加任何外部器件的情况下,利用单片机内部定时器,实现通信波特率可在一个较宽范围内调节,通过实验表明,此方法简便可行,具有可操作性和实际意义。     

串行通信接口在CPLD中的实现

分析串行通信接口的基本功能．采用自顶向下的设计方法，用原理图和VHDL语言这两种输入对串行通信接口芯片进行设计．阐述了顶层的原理图设计和各个模块的功能、实现的关键点以及解决的方法，在MAXPLUS Ⅱ编译环境下综合，得到比较理想的仿真结果，最后在Altera公司的复杂的可编程的逻辑装置(CPLD)中实现，并完成了单片机和PC机的通信。     

56800系列DSP的串行接口设计

1综述DSP56800系列数字信号处理器一个很重要的特点就是具有很丰富的I／O口和多种外围配置。这一点是继承了Motorola公司在控制器领域业已形成的强大优势。它们在单一的DSP芯片上集成了通用的I／O模块GPIO、异步串行通信模块SCI、同步串行外设模块SPI、同步串行通信模块SSI、控制器局域网模块CAN 2．0 A／B、多路A／D变换模块、用     

单片机与PC机串行通信中波特率的确定

详细论述了单片机与PC机串行通信中波特率的确定原则和方法，特别给出了PC机与单片机串行通信中非标准波特率的计算方法及不同环境下实现的实例。     

简析DSP与PC机间的数据通信

在目前,DSP的应用日益增多,应用之时DSP会与外界一直维持通信,基于此,该文简单介绍了DS TMS320LF2407之中能够用以通信的模块-串行通用接口,即为SCI,因此给出基于SCI模块实现DSP与PC机间数据通信的一类方法。本文还主要分析了硬件连接及其软件编程。     

Windows环境下PC机与单片机串行通信的实现

在介绍 PC机与单片机之间串行通信硬件组成的基础上 ,详细介绍了在 Windows环境下用 Visual C 6 .0的 Active X技术设计串行通信程序的方法 ,并给出了通信程序中的部分关键原代码     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.