Abstract: This application note explains the hardware of different types of 1-Wire® interfaces and software examples adapted to this hardware with a focus on serial ports. Depending on the types of iButtons required for a project and the type of computer to be used, the most economical interface is easily found. The hardware examples shown are basically two different types: 5V general interface and 12V RS-232 interface. Within the 5V group a common printed circuit board could be used for all circuits described. The variations can be achieved by different populations of components. The same principal is used for the 12V RS-232 interface. The population determines if it is a Read all or a Read/Write all type of interface. There are other possible circuit implementations to create a 1-Wire interface. The circuits described in this application note cover many different configurations. For a custom application, one of the described options can be adapted to meet individual needs.
標(biāo)簽： iButtons Reading Writing and
上傳時(shí)間： 2013-10-29
上傳用戶：long14578
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.
標(biāo)簽： routines slave I2C 87L
上傳時(shí)間： 2013-11-19
上傳用戶：shirleyYim
MPC7400 Part Number SpeciÞcationThis document describes part number speciÞc changes to recommended operating conditions and revised electrical speciÞcations,as applicable, from those described in the generalMPC7400 hardware SpeciÞcations.SpeciÞcations provided in this Part Number SpeciÞcation supersede those in theMPC7400 hardware SpeciÞcationsdated 9/99(order #: MPC7400EC/D) for these part numbers only; speciÞcations not addressed herein are unchanged. This document isfrequently updated, refer to the website at http://www.mot.com/SPS/PowerPC/ for the latest version.Note that headings and table numbers in this data sheet are not consecutively numbered. They are intended to correspond to theheading or table affected in the general hardware speciÞcation.
標(biāo)簽： Number Speci 7400 Part
上傳時(shí)間： 2014-12-28
上傳用戶：huyahui
This document describes part number speciÞc changes to recommended operating conditions and revised electrical speciÞcations,as applicable, from those described in the generalMPC7400 hardware SpeciÞcations.SpeciÞcations provided in this Part Number SpeciÞcation supersede those in theMPC7400 hardware SpeciÞcationsdated 9/99(order #: MPC7400EC/D) for these part numbers only; speciÞcations not addressed herein are unchanged. This document isfrequently updated, refer to the website at http://www.mot.com/SPS/PowerPC/ for the latest version.Note that headings and table numbers in this data sheet are not consecutively numbered. They are intended to correspond to theheading or table affected in the general hardware speciÞcation.Part numbers addressed in this document are listed in Table A. For more detailed ordering information see Table B.
上傳時(shí)間： 2013-11-19
上傳用戶：qiaoyue
CAN與RS232轉(zhuǎn)換節(jié)點(diǎn)的設(shè)計(jì)與實(shí)現(xiàn) 介紹將CAN總線接口與RS232總線接口相互轉(zhuǎn)換的設(shè)計(jì)方法和2種總線電平轉(zhuǎn)換關(guān)系，實(shí)現(xiàn)CAN總線與各模塊的接口設(shè)計(jì)，制定了相應(yīng)的軟硬件設(shè)計(jì)方案，并給出軟件設(shè)計(jì)流程圖以及部分硬件設(shè)計(jì)原理圖。為CAN總線與RS232總線互聯(lián)提供了一種方法，對(duì)CAN總線與RS232總線接口設(shè)備的互聯(lián)和廣泛應(yīng)用的實(shí)現(xiàn)具有重要意義。關(guān)鍵詞：CAN總線；RS-232總線；串行通信Design and Realization of CAN and RS232 Transformation NodeZHOU Wei, CHENG Xiao-hong(Information Institute, Wuhan University of Technology, Wuhan 430070)【Abstract】This paper introduces one design method of the CAN bus interface and the RS232 bus interface interconversion, emphasizes two kindof bus level transformation relations, realizes the CAN bus and various modules connection design, formulates the design proposal of correspondingsoftware and hardware, and gives the flow chart of software design as well as the partial schematic diagram of hardware design. It providesonemethod for the CAN bus and the RS232 bus interconnection, has the vital significance to widespread application realization of the CAN busand theRS232 bus interface equipment interconnection.【Key words】CAN bus; RS-232 bus; serial communication
標(biāo)簽： CAN 232 RS 轉(zhuǎn)換
上傳時(shí)間： 2013-11-04
上傳用戶：leesuper
MCSÉ-51 Programmer's Guide and Instruction Set The information presented in this chapter is collected from the MCSÉ-51 Architectural Overview and the hardwareDescription of the 8051, 8052 and 80C51 chapters of this book. The material has been selected and rearranged toform a quick and convenient reference for the programmers of the MCS-51. This guide pertains specifically to the8051, 8052 and 80C51.
標(biāo)簽： Program Eacute MCS 51
上傳時(shí)間： 2013-11-13
上傳用戶：hj_18
The STWD100 watchdog timer circuits are self-contained devices which prevent systemfailures that are caused by certain types of hardware errors (non-responding peripherals,bus contention, etc.) or software errors (bad code jump, code stuck in loop, etc.).The STWD100 watchdog timer has an input, WDI, and an output, WDO (see Figure 2). Theinput is used to clear the internal watchdog timer periodically within the specified timeoutperiod, twd (see Section 3: Watchdog timing). While the system is operating correctly, itperiodically toggles the watchdog input, WDI. If the system fails, the watchdog timer is notreset, a system alert is generated and the watchdog output, WDO, is asserted (seeSection 3: Watchdog timing).The STWD100 circuit also has an enable pin, EN (see Figure 2), which can enable ordisable the watchdog functionality. The EN pin is connected to the internal pull-downresistor. The device is enabled if the EN pin is left floating.
上傳時(shí)間： 2013-10-22
上傳用戶：taiyang250072
winCE msdn講座 XP Embedded Now and the future Windows XP Embedded Developmentand Deployment Model OverviewWindows XP Embedded Component ModelWindows XP Embedded Studio Tools Microsoft WindowsXP Embedded Product Highlights Componentized version of Windows XP Professional~ 12,000 components and updates as of Service Pack 2Flexible localizationSame binaries and API as Windows XP ProfessionalHotfixes and service packsEmbedded Enabling FeaturesRuns on standard PC hardwareSupports boot on hard drives, compact flash, DiskOnChipand read-only mediaSupport for remote install and remote bootHeadless device and remote management supportIntegration with Microsoft management tools
上傳時(shí)間： 2013-10-31
上傳用戶：jrsoft
基于單片機(jī)的汽車(chē)多功能報(bào)警系統(tǒng)設(shè)計(jì)The Design of Automobile Multi-function AlarmingBased on Single Chip Computer劉法治趙明富寧睡達(dá)(河 南 科 技 學(xué) 院 ，新 鄉(xiāng) 453 00 3)摘要介紹了一種基于單片機(jī)控制的汽車(chē)多功能報(bào)警系統(tǒng)，它能對(duì)汽車(chē)的潤(rùn)滑系統(tǒng)油壓、制動(dòng)系統(tǒng)氣壓、冷卻系統(tǒng)溫度、輪胎欠壓及防盜進(jìn)行自動(dòng)檢測(cè)，并在發(fā)現(xiàn)異常情況時(shí)，發(fā)出聲光報(bào)警。闡述了該報(bào)警系統(tǒng)的硬件組成及軟件設(shè)計(jì)方法。關(guān)鍵詞單片機(jī)傳感器數(shù)模轉(zhuǎn)換報(bào)警Abstract Am ulti-fimctiona utomobilea larnungs ystemb asedo ns inglec hipc omputerco ntorlis in torducedin th isp aper.Th eo ilpr essuero flu bricatesystem, air pressure of braking system, temperature of cooling system, under pressure of tyre and guard against theft， detected automaticaly場(chǎng)thesystem. Audio and visual alarms wil be provided under abnormal conditions廠The hardware composition and software design of the system， described.Keywords Singlec hipc omputer Sensor Digital-t-oanaloguec onversion Alarmin 汽車(chē)多功能報(bào)苦器硬件系統(tǒng)設(shè)計(jì)根據(jù) 系 統(tǒng) 實(shí)際需要和產(chǎn)品性價(jià)比，選用ATMEL公司新生產(chǎn)的采用CMOs工藝的低功耗、高性能8位單片機(jī)AT89S52作為系統(tǒng)的控制器。AT89S52的片內(nèi)有8k Bytes LSP Flash閃爍存儲(chǔ)器，可進(jìn)行100(〕次寫(xiě)、擦除操作;256Bytes內(nèi)部數(shù)據(jù)存儲(chǔ)器(RAM);3 2 根可編程輸N輸出線;2個(gè)可編程全雙工串行通道;看門(mén)狗(WTD)電路等。系統(tǒng)由傳感器、單片機(jī)、模數(shù)轉(zhuǎn)換器、無(wú)線信號(hào)發(fā)射電路、指示燈驅(qū)動(dòng)電路、聲光報(bào)警驅(qū)動(dòng)電KD一9563，發(fā)出三聲二閃光。并觸發(fā)一個(gè)高電平，驅(qū)動(dòng)無(wú)線信號(hào)發(fā)射電路。
標(biāo)簽： 單片機(jī) 汽車(chē) 多功能 報(bào)警
上傳時(shí)間： 2013-11-09
上傳用戶：gxmm
基于USB接口的數(shù)據(jù)采集模塊的設(shè)計(jì)與實(shí)現(xiàn)Design and Implementation of USB-Based Data Acquisition Module路 永 伸(天津科技大學(xué)電子信息與自動(dòng)化學(xué)院，天津300222)摘要文中給出基于USB接口的數(shù)據(jù)采集模塊的設(shè)計(jì)與實(shí)現(xiàn)。硬件設(shè)計(jì)采用以Adpc831與PDIUSBDI2為主的器件進(jìn)行硬件設(shè)計(jì)，采用Windriver開(kāi)發(fā)USB驅(qū)動(dòng)，并用Visual C十十6.0對(duì)主機(jī)軟件中硬件接口操作部分進(jìn)行動(dòng)態(tài)鏈接庫(kù)封裝。關(guān)鍵詞USB 數(shù)據(jù)采集Adpc831 PDNSBDI2 Windriver動(dòng)態(tài)鏈接庫(kù)Abstract T hed esigna ndim plementaitono fU SB-BasedD ataA cquisiitonM oduleis g iven.Th ec hips oluitonm ainlyw ithA dpc831a ndP DTUSBD12i sused for hardware design. The USB drive is developed場(chǎng)Wmdriver, and the operation on the hardware interface is packaged into Dynamic Link Libraries場(chǎng)Visual C++6.0. Keywords USB DataA cquisition Adttc831 PDfUSBD12 Windriver0 引言US B總 線 是新一代接口總線，最初推出的目的是為了統(tǒng)一取代PC機(jī)的各類外設(shè)接口，迄今經(jīng)歷了1.0,1.1與2.0版本3個(gè)標(biāo)準(zhǔn)。在國(guó)內(nèi)基于USB總線的相關(guān)設(shè)計(jì)與開(kāi)發(fā)也得到了快速的發(fā)展，很多設(shè)計(jì)者從各自的應(yīng)用領(lǐng)域，用不同方案設(shè)計(jì)出了相應(yīng)的裝置[1,2]。數(shù)據(jù)采集是工業(yè)控制中一個(gè)普遍而重要的環(huán)節(jié)，因此開(kāi)發(fā)基于USB接口的數(shù)據(jù)采集模塊具有很強(qiáng)的現(xiàn)實(shí)應(yīng)用意義。雖然 US B總線標(biāo)準(zhǔn)已經(jīng)發(fā)展到2.0版本，但由于工業(yè)控制現(xiàn)場(chǎng)干擾信號(hào)的情況比較復(fù)雜，高速數(shù)據(jù)傳輸?shù)目煽啃圆蝗菀妆槐ＷC，并且很多場(chǎng)合對(duì)數(shù)據(jù)采集的實(shí)時(shí)性要求并不高，開(kāi)發(fā)2.0標(biāo)準(zhǔn)產(chǎn)品的成本又較1.1標(biāo)準(zhǔn)產(chǎn)品高，所以筆者認(rèn)為，在工業(yè)控制領(lǐng)域，目前開(kāi)發(fā)基于USB總線1.1標(biāo)準(zhǔn)實(shí)現(xiàn)的數(shù)據(jù)采集模塊的實(shí)用意義大于相應(yīng)2.0標(biāo)準(zhǔn)模塊。
標(biāo)簽： USB 接口 數(shù)據(jù)采集模塊
上傳時(shí)間： 2013-10-23
上傳用戶：q3290766
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