嵌入式系统中键盘及LED显示的接口设计

在监控设备的电路设计中,键盘和显示需要占用MCU大量的硬、软件资源,为MCU扩展串行通信驱动芯片可以较好地解决此类问题。结合嵌入式微控制器LPC2148,采用串行键盘显示驱动芯片CH451,设计相应的接口电路和软件驱动与管理程序,可以实现8位LED显示、64位按键,中断方式快速响应外部键盘中断。电路简单、运行效率高,可用于一般工业监控设备的电路设计与应用。     

自由调整中断优先级的研究和实现

在建立了同时中断优先级和并发中断优先级等概念的基础上，分析了中断响应过程，用中断处理次序概念从本质上描述中断处理中的优先含义，从而实现对系统机中中断源处理的优先级别的自由调整。给出了在PC系列机环境下，改变并发中断优先级，实现理想的中断处理顺序调整的具体方法。     

基于DMA控制器的UART串行通信设计

针对大数据量的串口间通信,在常规的UART串行数据通信的基础上,结合Cortex-M3微控制器中DMA控制器的作用,实现DMA控制的UART串口数据包收发。设计链表项缓存,最终实现DMA的分散/聚集模式的数据传输过程,主要是发送过程。提高了串行数据通信过程的MCU独立性和MCU利用的效率。     

调频信道机中一种数字锁相振荡器的设计

介绍了“吞除脉冲”式串行数字锁相频率合成器MB1501,在MCU(微控制器)及C51编程语言的支持下,利用场效应管振荡器构成的一种数字锁相振荡器。它具有结构简单,稳定性好,精度高,易实现等特点。     

Flexis JM控制器提供8位与32位间的兼容性和易用性

通用串行总线（USB）连接已成为串行通信的普遍标准，广泛应用于各种设备中，从PC外设、数据传输设备（记忆棒）、灯光控制系统、测试和测量设备、病人监控系统、安全和进出控制面板，以及其他工业设备等不胜枚举。飞思卡尔半导体业推出了Flexis JM系列微控制器（MCU），     

SPI串行外设接口设计

同步串行通信接口SPI(Serial Peripheral Interface)用于DSP、MCU之间或者外设与DSP、MCU之间的高速通讯，使用简便，因而在微控制系统中获得广泛的应用。本文讨论了一种异步串行通信接口的结构。     

直流电机控制器测试系统的MCU方软件设计

本文详细介绍了直流电机控制器测试系统的MCU方软件设计与实现的思路与方法,提出MCU方软件实现的总体原则,并分解MCU方的子程序,主要序包括芯片初始化程序、A/D转换程序、输入捕捉程序、PWM输出程序、串行通信程序、开关驱动程序和中断处理程序,通过对各个子程序功能的分析最终提出设计方案。     

瑞萨发布LCD控制器／驱动器R61201

HT49CV3为Holtek新一代8位VFD(真空萤光显示管)Mask ROM型微控制器(MCU)，具有2K Mask ROM程序内存，配备96字节Data RAM，并有两组16位定时器、SIO串行输入／输出作为与其他系统沟通的桥梁。Buzzer／PFD可用于声音输出，RMT则可用于IR接收译码。     

基于LM3S101的数字采控器设计

给出了一种新型数字采控器的设计方法。该系统硬件以ARM Cortex—M3内核的LM3S101微控制器为核心,采用专用RS-485通信器件和串行-并行转换器件来简化系统的硬件结构;软件则采用模块化设计思想,并利用中断技术来实现远程通信。设计出的数字采控器结构简单,性价比高,系统运行稳定可靠。     

Freescale的Flexis JM实现8至32位兼容——对USB连接进行快速启动和开发

USB连接已成为串行通信的普遍标准,广泛应用于各种设备中,从PC外设和记忆棒到工业设备等不胜枚举。Freescale半导体08年2月推出了其Flexis JM系列微控制器(MCU),帮助     

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.     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first