The 87LPC76X Microcontroller combines in a small package thebenefits of a high-performance microcontroller with on-boardhardware supporting the Inter-Integrated Circuit (I2C) bus interface.The 87LPC76X can be programmed both as an I2C bus master, aslave, or both. An overview of the I2C bus and description of the bussupport hardware in the 87LPC76X microcontrollers appears inapplication note AN464, Using the 87LPC76X Microcontroller as anI2C Bus Master. That application note includes a programmingexample, demonstrating a bus-master code. Here we show anexample of programming the microcontroller as an I2C slave.The code listing demonstrates communications routines for the87LPC76X as a slave on the I2C bus. It compliments the program inAN464 which demonstrates the 87LPC76X as an I2C bus master.One may demonstrate two 87LPC76X devices communicating witheach other on the I2C bus, using the AN464 code in one, and theprogram presented here in the other. The examples presented hereand in AN464 allow the 87LPC76X to be either a master or a slave,but not both. Switching between master and slave roles in amultimaster environment is described in application note AN435.The software for a slave on the bus is relatively Simple, as theprocessor plays a relatively passive role. It does not initiate bustransfers on its own, but responds to a master initiating thecommunications. This is true whether the slave receives or transmitsdata—transmission takes place only as a response to a busmaster’s request. The slave does not have to worry about arbitrationor about devices which do not acknowledge their address. As theslave is not supposed to take control of the bus, we do not demandit to resolve bus exceptions or “hangups”. If the bus becomesinactive the processor simply withdraws, not interfering with themaster (or masters) on the bus which should (hopefully) try toresolve the situation.
上傳時間： 2013-11-19
上傳用戶：shirleyYim
Presents short and Simple I2C software routines that support onlyslave (rather than master or master & slave) operation and an ASMdemonstration program. The slave-only software in this app notecomplements the master mode software presented in AN464, Usingthe 87LPC76X microcontroller as an I2C bus master.
上傳時間： 2013-11-22
上傳用戶：1039312764
一種基于ST62單片機的稱重顯示控制器A Weighing Display Controller Based on ST62 Single Chip Computer祛 FA(上海時博飛奧控制系統有限公司，上海201100)摘要在介紹了基于ST62單片機的基礎上，詳細描述了稱重顯控制器的硬件設計和軟件設計思路。該控制器結構簡單、操作方便、抗擾能力強等優點;具有較好的推廣應用價值。關鍵詞稱重顯示控制儀ST62單片機硬件設計軟件設計Abstract Ont heb asiso fin torductiono fST 62s inglec hipc omputer,th ed esignc oncrptof h ardwarea nds oftwarefo rw eighingd isplayc ontorleris d escrbed.The controler features Simple structure, ease operation, powerful capability of anti-interference, etc.，it is wealth to be promoted into practicalapplicationsKeywords We妙噸display0 引言ST62s inglec hip Hardwared esign Softwaer design備 份 振 蕩器，振蕩器保護電路，上電復位及低壓檢測復稱 重 顯 示控制器是一種具有數字顯示、開關量輸出、定值控制和通信功能的以微機為操作核心的稱重控制裝置。它是電子衡器的重要基礎部件，直接影響電子衡器及電子稱重系統的功能和性能。與合適的傳感器及承重傳力復位系統組合可組成配料秤、料斗秤、定值秤、平臺秤、汽車秤等，廣泛應用于電力、化工、建筑、冶金、交通運輸、食品、軍工等部門，是進行自動稱重配料控制和生產過程自動化必不可少的重要檢測、控制裝置。隨著 稱 重 計量自動化水平的提高，對稱重顯示控制器的要求也越來越高。為實現低漂移、高穩定，本控制器采用低漂移、高增益放大器AD620和高分辨率的A/D轉換器CS5550。為提高穩定性和可靠性，采用集成度高的、抗干擾能力強的ST62單片機。
上傳時間： 2013-10-29
上傳用戶：釣鰲牧馬
The PL2303 USB to Serial adapter is your smart and convenient accessory forconnecting RS-232 serial devices to your USB-equipped Windows host computer. Itprovides a bridge connection with a standard DB 9-pin male serial port connector inone end and a standard Type-A USB plug connector on the other end. You simplyattach the serial device onto the serial port of the cable and plug the USB connectorinto your PC USB port. It allows a Simple and easy way of adding serial connectionsto your PC without having to go thru inserting a serial card and traditional portconfiguration.This USB to Serial adapter is ideal for connecting modems, cellular phones, PDAs,digital cameras, card readers and other serial devices to your computer. It providesserial connections up to 1Mbps of data transfer rate. And since USB does not requireany IRQ resource, more devices can be attached to the system without the previoushassles of device and resource conflicts.Finally, the PL-2303 USB to Serial adapter is a fully USB Specification compliantdevice and therefore supports advanced power management such as suspend andresume operations as well as remote wakeup. The PL-2303 USB Serial cable adapteris designed to work on all Windows operating systems.
上傳時間： 2013-11-01
上傳用戶：ghostparker
針對傳統集成電路（ASIC）功能固定、升級困難等缺點，利用FPGA實現了擴頻通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核實現NCO模塊，在下變頻模塊調用了硬核乘法器并引入CIC濾波器進行低通濾波，給出了DQPSK解調的原理和實現方法，推導出一種簡便的引入?仔/4固定相移的實現方法。采用模塊化的設計方法使用VHDL語言編寫出源程序，在Virtex-II Pro 開發板上成功實現了整個系統。測試結果表明該系統正確實現了STEL-2000A的核心功能。 Abstract: To overcome drawbacks of ASIC such as fixed functionality and upgrade difficulty, FPGA was used to realize the core functions of STEL-2000A. This paper used the DDS IP core provided by ISE to realize the NCO module, called hard core multiplier and implemented CIC filter in the down converter, described the principle and implementation detail of the demodulation of DQPSK, and derived a Simple method to introduce a fixed phase shift of ?仔/4. The VHDL source code was designed by modularity method , and the complete system was successfully implemented on Virtex-II Pro development board. Test results indicate that this system successfully realize the core function of the STEL-2000A.
上傳時間： 2013-11-06
上傳用戶：liu123
很多不同的廠家生產各種型號的計算機，它們運行完全不同的操作系統，但TCP.IP協議族允許它們互相進行通信。這一點很讓人感到吃驚，因為它的作用已遠遠超出了起初的設想。T C P / I P起源于6 0年代末美國政府資助的一個分組交換網絡研究項目，到9 0年代已發展成為計算機之間最常應用的組網形式。它是一個真正的開放系統，因為協議族的定義及其多種實現可以不用花錢或花很少的錢就可以公開地得到。它成為被稱作“全球互聯網”或“因特網(Internet)”的基礎，該廣域網（WA N）已包含超過1 0 0萬臺遍布世界各地的計算機。本章主要對T C P / I P協議族進行概述，其目的是為本書其余章節提供充分的背景知識。 TCP.IP協議 縮略語 ACK (ACKnowledgment) TCP首部中的確認標志 API (Application Programming Interface) 應用編程接口 ARP (Address Resolution Protocol) 地址解析協議 ARPANET(Defense Advanced Research Project Agency NETwork) (美國)國防部遠景研究規劃局 AS (Autonomous System) 自治系統 ASCII (American Standard Code for Information Interchange) 美國信息交換標準碼 ASN.1 (Abstract Syntax Notation One) 抽象語法記法1 BER (Basic Encoding Rule) 基本編碼規則 BGP (Border Gateway Protocol) 邊界網關協議 BIND (Berkeley Internet Name Domain) 伯克利I n t e r n e t域名 BOOTP (BOOTstrap Protocol) 引導程序協議 BPF (BSD Packet Filter) BSD 分組過濾器 CIDR (Classless InterDomain Routing) 無類型域間選路 CIX (Commercial Internet Exchange) 商業互聯網交換 CLNP (ConnectionLess Network Protocol) 無連接網絡協議 CRC (Cyclic Redundancy Check) 循環冗余檢驗 CSLIP (Compressed SLIP) 壓縮的S L I P CSMA (Carrier Sense Multiple Access) 載波偵聽多路存取 DCE (Data Circuit-terminating Equipment) 數據電路端接設備 DDN (Defense Data Network) 國防數據網 DF (Don’t Fragment) IP首部中的不分片標志 DHCP (Dynamic Host Configuration Protocol) 動態主機配置協議 DLPI (Data Link Provider Interface) 數據鏈路提供者接口 DNS (Domain Name System) 域名系統 DSAP (Destination Service Access Point) 目的服務訪問點 DSLAM (DSL Access Multiplexer) 數字用戶線接入復用器 DSSS (Direct Sequence Spread Spectrum) 直接序列擴頻 DTS (Distributed Time Service) 分布式時間服務 DVMRP (Distance Vector Multicast Routing Protocol) 距離向量多播選路協議 EBONE (European IP BackbONE) 歐洲I P主干網 EOL (End of Option List) 選項清單結束 EGP (External Gateway Protocol) 外部網關協議 EIA (Electronic Industries Association) 美國電子工業協會 FCS (Frame Check Sequence) 幀檢驗序列 FDDI (Fiber Distributed Data Interface) 光纖分布式數據接口 FIFO (First In, First Out) 先進先出 FIN (FINish) TCP首部中的結束標志 FQDN (Full Qualified Domain Name) 完全合格的域名 FTP (File Transfer Protocol) 文件傳送協議 HDLC (High-level Data Link Control) 高級數據鏈路控制 HELLO 選路協議 IAB (Internet Architecture Board) Internet體系結構委員會 IANA (Internet Assigned Numbers Authority) Internet號分配機構 ICMP (Internet Control Message Protocol) Internet控制報文協議 IDRP (InterDomain Routing Protocol) 域間選路協議 IEEE (Institute of Electrical and Electronics Engineering) （美國）電氣與電子工程師協會 IEN (Internet Experiment Notes) 互聯網試驗注釋 IESG (Internet Engineering Steering Group) Internet工程指導小組 IETF (Internet Engineering Task Force) Internet工程專門小組 IGMP (Internet Group Management Protocol) Internet組管理協議 IGP (Interior Gateway Protocol) 內部網關協議 IMAP (Internet Message Access Protocol) Internet報文存取協議 IP (Internet Protocol) 網際協議 I RTF (Internet Research Task Force) Internet研究專門小組 IS-IS (Intermediate System to Intermediate System Protocol) 中間系統到中間系統協議 ISN (Initial Sequence Number) 初始序號 ISO (International Organization for Standardization) 國際標準化組織 ISOC (Internet SOCiety) Internet協會 LAN (Local Area Network) 局域網 LBX (Low Bandwidth X) 低帶寬X LCP (Link Control Protocol) 鏈路控制協議 LFN (Long Fat Net) 長肥網絡 LIFO (Last In, First Out) 后進先出 LLC (Logical Link Control) 邏輯鏈路控制 LSRR (Loose Source and Record Route) 寬松的源站及記錄路由 MBONE (Multicast Backbone On the InterNEt) Internet上的多播主干網 MIB (Management Information Base) 管理信息庫 MILNET (MILitary NETwork) 軍用網 MIME (Multipurpose Internet Mail Extensions) 通用I n t e r n e t郵件擴充 MSL (Maximum Segment Lifetime) 報文段最大生存時間 MSS (Maximum Segment Size) 最大報文段長度 M TA (Message Transfer Agent) 報文傳送代理 MTU (Maximum Transmission Unit) 最大傳輸單元 NCP (Network Control Protocol) 網絡控制協議 NFS (Network File System) 網絡文件系統 NIC (Network Information Center) 網絡信息中心 NIT (Network Interface Tap) 網絡接口栓（S u n公司的一個程序） NNTP (Network News Transfer Protocol) 網絡新聞傳送協議 NOAO (National Optical Astronomy Observatories) 國家光學天文臺 NOP (No Operation) 無操作 NSFNET (National Science Foundation NETwork) 國家科學基金網絡 NSI (NASA Science Internet) （美國）國家宇航局I n t e r n e t NTP (Network Time Protocol) 網絡時間協議 NVT (Network Virtual Terminal) 網絡虛擬終端 OSF (Open Software Foudation) 開放軟件基金 OSI (Open Systems Interconnection) 開放系統互連 OSPF (Open Shortest Path First) 開放最短通路優先 PAWS (Protection Against Wrapped Sequence number) 防止回繞的序號 PDU (Protocol Data Unit) 協議數據單元 POSIX (Portable Operating System Interface) 可移植操作系統接口 PPP (Point-to-Point Protocol) 點對點協議 PSH (PuSH) TCP首部中的急迫標志 RARP (Reverse Address Resolution Protocol) 逆地址解析協議 RFC (Request For Comments) Internet的文檔，其中的少部分成為標準文檔 RIP (Routing Information Protocol) 路由信息協議 RPC (Remote Procedure Call) 遠程過程調用 RR (Resource Record) 資源記錄 RST (ReSeT) TCP首部中的復位標志 RTO (Retransmission Time Out) 重傳超時 RTT (Round-Trip Time) 往返時間 SACK (Selective ACKnowledgment) 有選擇的確認 SLIP (Serial Line Internet Protocol) 串行線路I n t e r n e t協議 SMI (Structure of Management Information) 管理信息結構 SMTP (Simple Mail Transfer Protocol) 簡單郵件傳送協議 SNMP (Simple Network Management Protocol) 簡單網絡管理協議 SSAP (Source Service Access Point) 源服務訪問點 SSRR (Strict Source and Record Route) 嚴格的源站及記錄路由 SWS (Silly Window Syndrome) 糊涂窗口綜合癥 SYN (SYNchronous) TCP首部中的同步序號標志 TCP (Transmission Control Protocol) 傳輸控制協議 TFTP (Trivial File Transfer Protocol) 簡單文件傳送協議 TLI (Transport Layer Interface) 運輸層接口 TTL (Ti m e - To-Live) 生存時間或壽命 TUBA (TCP and UDP with Bigger Addresses) 具有更長地址的T C P和U D P Telnet 遠程終端協議 UA (User Agent) 用戶代理 UDP (User Datagram Protocol) 用戶數據報協議 URG (URGent) TCP首部中的緊急指針標志 UTC (Coordinated Universal Time) 協調的統一時間 UUCP (Unix-to-Unix CoPy) Unix到U n i x的復制 WAN (Wide Area Network) 廣域網 WWW (World Wide Web) 萬維網 XDR (eXternal Data Representation) 外部數據表示 XID (transaction ID) 事務標識符 XTI (X/Open Transport Layer Interface) X/ O p e n運輸層接口
上傳時間： 2013-11-13
上傳用戶：tdyoung
Abstract: This design idea shows how you can design a Simple wireless temperaturemonitoring
上傳時間： 2013-10-25
上傳用戶：cicizoe
This application note provides step-by-step instructions on how to recreate a Tri-Mode Ethernet(TEMAC) performance testing system using the ML405 board and MontaVista Linux 4.0. Thisapplication note shows how to set up a Simple EDK Base System Builder system on the ML405Evaluation Platform and run performance tests. The network architecture for the test isdescribed. A system is built and downloaded into the FPGA. A MontaVista Linux kernel isconfigured, built, and downloaded into the ML405 Evaluation Platform. The instructions forobtaining and setting up the software used to perform the measurements, netperf, are given.
上傳時間： 2013-11-11
上傳用戶：saharawalker
This is the Xilinx Dual Processor Reference Designs suite. The designs illustrate a few differentdual-core architectures based on the MicroBlaze™ and PowerPC™ processors. The designsillustrate various concepts described in the Xilinx White Paper WP262 titled, “DesigningMultiprocessor Systems in Platform Studio”. There are Simple software applications includedwith the reference designs that show various forms of interaction between the two processors.
上傳時間： 2013-10-29
上傳用戶：旭521
This book is for students and Linux System Administrators. It provides the skills to read, write, and debug Linux shell scripts using bash shell. The book begins by describing Linux and Simple scripts to automate frequently executed commands and continues by describing conditional logic, user interaction, loops, menus, traps, and functions.
上傳時間： 2014-12-30
上傳用戶：黃蛋的蛋黃
