在需要實時大量輸入漢字的顯示控制處理應(yīng)用中，利用傳統(tǒng)單片機實現(xiàn)顯示控制的設(shè)計方法是較難實現(xiàn)的。帶漢字字庫的液晶模塊的使用使得小容量ROM單片機的大量漢字信息輸入與顯示成為可能。提出了針對漢字字庫編碼的二級索引拼音輸入檢索方法,介紹了以ST7920作為控制器的帶漢字字庫的液晶顯示模塊的接口方法及漢字顯示和控制原理，給出了通用計算機鍵盤在單片機中的串行接口，采用該技術(shù)可大大增強單片機的漢字輸入功能。為小容量ROM單片機的大批量漢字信息處理提供了一種漢字輸入解決方案。 Abstract: It is difficult to realize Chinese characters input method based on the embedded system by using the traditional design method of display control. It is possible to input and display Chinese characters based on the embedded system with the ROM of small content by using the LCD module with Chinese characters.Chinese characters input method of the quadric index recall in allusion to Chinese characters code is brought forward.The interface and the principle of Chinese characters display control based on the LCD module controlled with the ST7920 is introduced too.The serial interface of the computer keyboard in common use and the embedded system is given at the same time. It can enhance the embedded system function of Chinese characters input by using this technology, and provide a kind of Chinese characters input scheme for the embedded system with small capacity ROM.
上傳時間： 2013-11-19
上傳用戶：jhksyghr
為解決輸油管道溫度壓力參數(shù)實時監(jiān)測的問題，設(shè)計了以C8051F930單片機作為控制核心的超低功耗輸油管道溫度壓力遠程監(jiān)測系統(tǒng)。現(xiàn)場儀表使用高精度電橋采集數(shù)據(jù)，通過433 MHz短距離無線通信網(wǎng)絡(luò)與遠程終端RTU進行通信，RTU通過GPRS網(wǎng)絡(luò)與PC上位機進行遠程數(shù)據(jù)傳輸，在上位機中實現(xiàn)數(shù)據(jù)存儲和圖形化界面顯示，從而實現(xiàn)輸油管道溫度壓力參數(shù)的實時監(jiān)測和異常報警。經(jīng)實驗證明，該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設(shè)計要求，漏碼率小于1%，正常工作時間超過5個月，能實時有效地監(jiān)測輸油管道的溫度壓力參數(shù)，節(jié)省大量人工成本，有效預(yù)防管道參數(shù)異常造成的經(jīng)濟損失和環(huán)境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
標(biāo)簽： C8051F930 溫度 壓力 遠程監(jiān)測系統(tǒng)
上傳時間： 2013-11-07
上傳用戶：cuibaigao
LLCR Pin Socket Testing with the Model 3732 High Density Matrix Card Computer processors (CPUs) today have come a long way from the computer processors of the past. They draw more power, run at lower voltages, and have more pins than ever before.
標(biāo)簽： Testing Socket LLCR with
上傳時間： 2013-10-24
上傳用戶：whenfly
51單片機及其應(yīng)用:1.1.1 電子計算機的問世及其經(jīng)典結(jié)構(gòu)1946年2月15日，第一臺電子數(shù)字計算機問世，這標(biāo)志著計算機時代的到來。（CALCULATOR）ENIAC（“埃尼阿克”）◆ENIAC是電子管計算機，時鐘頻率僅有100 KHz，但能在1秒鐘的時間內(nèi)完成5000次加法運算。◆與現(xiàn)代的計算機相比，有許多不足，但它的問世開創(chuàng)了計算機科學(xué)技術(shù)的新紀元，對人類的生產(chǎn)和生活方式產(chǎn)生了巨大的影響 。 匈牙利籍?dāng)?shù)學(xué)家馮·諾依曼在方案的設(shè)計上做出了重要的貢獻。1946年6月，他又提出了“程序存儲”和“二進制運算”的思想，進一步構(gòu)建了計算機由運算器、控制器、存儲器、輸入設(shè)備和輸出設(shè)備組成這一計算機的經(jīng)典結(jié)構(gòu)。（EDVAC-ELECTRONIC DISCRETE VARIABLE AUTOMATIC COMPUTER）二、微型計算機的應(yīng)用形態(tài) 從應(yīng)用形態(tài)上，微機可以分成三種：
標(biāo)簽： 51單片機
上傳時間： 2013-12-20
上傳用戶：d815185728
本文依據(jù)集成電路設(shè)計方法學(xué)，探討了一種基于標(biāo)準Intel 8086 微處理器的單芯片計算機平臺的架構(gòu)。研究了其與SDRAM，8255 并行接口等外圍IP 的集成，并在對AMBA協(xié)議和8086 CPU分析的基礎(chǔ)上，采用遵從AMBA傳輸協(xié)議的系統(tǒng)總線代替?zhèn)鹘y(tǒng)的8086 CPU三總線結(jié)構(gòu)，搭建了基于8086 IP 軟核的單芯片計算機系統(tǒng)，并實現(xiàn)了FPGA 功能演示。關(guān)鍵詞：微處理器； SoC；單芯片計算機；AMBA 協(xié)議 Design of 8086 CPU Based Computer-on-a-chip System（School of Electrical Engineering and Automation, Heifei University of Technology, Hefei, 230009,China）Abstract: According to the IC design methodology, this paper discusses the design of one kind of Computer-on-a-chip system architecture, which is based on the standard Intel8086 microprocessor,investigates how to integrate the 8086 CPU and peripheral IP such as, SDRAM controller, 8255 PPI etc. Based on the analysis of the standard Intel8086 microprocessor and AMBA Specification,the Computer-on-a-chip system based on 8086 CPU which uses AMBA bus instead of traditional three-bus structure of 8086 CPU is constructed, and the FPGA hardware emulation is fulfilled.Key words: Microprocessor; SoC; Computer-on-a-chip; AMBA Specification
標(biāo)簽： 8086 CPU 單芯片 計算機系統(tǒng)
上傳時間： 2013-12-27
上傳用戶：kernor
基于PIC單片機的低功耗讀卡器硬件設(shè)計:本文提出了一個完整的基于串口的智能讀卡器子系統(tǒng)設(shè)計方案并將其實現(xiàn)。讀卡器的設(shè)計突出了小型化的要求，全部器件使用貼片封裝。為了減小讀卡器的體積，設(shè)計中還使用了串口竊電的技術(shù)，使用串口信號線直接給讀卡器供電。為此，讀卡器使用了省電的設(shè)計，采用了省電的集成電路，并大膽簡化了許多傳統(tǒng)的設(shè)計電路。關(guān)鍵字： 讀卡器， 單片機， 串口竊電 Abstract： This paper aims to put forward a complete design of Smart IC card reader based onSerial Port and propose the way of realizing it for the purpose of Network Security. SMD isadopted to make Smart IC reader smaller in this design. To reduce the volume of Smart ICreader， Serial Port powered technology is employed to get power from the signal line of Serial Port. For this reason， low-power consumption components are adopted in the design and some traditional designs are simplified to reduce the power consumption.Keywords： Card Reader； Single-chip Computer； Serial Port Powered IC 卡系統(tǒng)保存了加密算法所需要的工作密鑰，供加密算法對網(wǎng)絡(luò)上傳輸?shù)臄?shù)據(jù)加密使用，是整個系統(tǒng)網(wǎng)絡(luò)安全的核心。在IC 卡子系統(tǒng)中，讀卡器是一個重要的部分。它起著管理IC卡、在IC 卡和PC或網(wǎng)絡(luò)計算機間傳遞數(shù)據(jù)的重要作用。本文以一片PIC單片機為核心完成了基于RS232 串口的讀卡器的硬件設(shè)計。
上傳時間： 2014-04-14
上傳用戶：wanghui2438
一種實用的微機自動配料秤系統(tǒng):介紹一種由單片機構(gòu)成的配料秤。敘述了秤的傳感器、變送器、信號的變換、硬件原理、軟件流程以及和DCS 系統(tǒng)構(gòu)成的單回路調(diào)節(jié)系統(tǒng),此系統(tǒng)可廣泛地應(yīng)用于各行業(yè)的配料控制中。關(guān)鍵詞:配料秤 單片機 單回路調(diào)節(jié)系統(tǒng) DCS 系統(tǒng) Abstract :A proportioning weigher based on single chip computer is introduced. Sensors , transmitters , signal converting , principle of hardware ,software flowchart of proportioning weigher and single loop control system composed with DCS system are emphasized ,this system can be used in proportioning control of various trades extensively.Key Words :Proportioning Weigher ,Single Chip Computer ,Single Loop Control System ,Distributed Control System
上傳時間： 2013-10-12
上傳用戶：zwei41
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
上傳時間： 2013-10-29
上傳用戶：long14578
I2C interface, is a very powerful tool for system designers. Theintegrated protocols allow systems to be completely software defined.Software development time of different products can be reduced byassembling a library of reusable software modules. In addition, themultimaster capability allows rapid testing and alignment ofend-products via external connections to an assembly-line computer.The mask programmable 87LPC76X and its EPROM version, the87LPC76X, can operate as a master or a slave device on the I2Csmall area network. In addition to the efficient interface to thededicated function ICs in the I2C family, the on-board interfacefacilities I/O and RAM expansion, access to EEPROM andprocessor-to-processor communications.
標(biāo)簽： microcontro Using 76X LPC
上傳時間： 2013-12-30
上傳用戶：Artemis
計算機部件要具有通用性，適應(yīng)不同系統(tǒng)與不同用戶的需求，設(shè)計必須模塊化。計算機部件產(chǎn)品(模塊)供應(yīng)出現(xiàn)多元化。模塊之間的聯(lián)接關(guān)系要標(biāo)準化，使模塊具有通用性。模塊設(shè)計必須基于一種大多數(shù)廠商認可的模塊聯(lián)接關(guān)系，即一種總線標(biāo)準。總線的標(biāo)準總線是一類信號線的集合是模塊間傳輸信息的公共通道，通過它，計算機各部件間可進行各種數(shù)據(jù)和命令的傳送。為使不同供應(yīng)商的產(chǎn)品間能夠互換，給用戶更多的選擇，總線的技術(shù)規(guī)范要標(biāo)準化。總線的標(biāo)準制定要經(jīng)周密考慮，要有嚴格的規(guī)定。總線標(biāo)準（技術(shù)規(guī)范）包括以下幾部分：機械結(jié)構(gòu)規(guī)范：模塊尺寸、總線插頭、總線接插件以及按裝尺寸均有統(tǒng)一規(guī)定。功能規(guī)范：總線每條信號線（引腳的名稱）、功能以及工作過程要有統(tǒng)一規(guī)定。電氣規(guī)范：總線每條信號線的有效電平、動態(tài)轉(zhuǎn)換時間、負載能力等。總線的發(fā)展情況S-100總線：產(chǎn)生于1975年，第一個標(biāo)準化總線，為微計算機技術(shù)發(fā)展起到了推動作用。IBM-PC個人計算機采用總線結(jié)構(gòu)（Industry Standard Architecture, ISA)并成為工業(yè)化的標(biāo)準。先后出現(xiàn)8位ISA總線、16位ISA總線以及后來兼容廠商推出的EISA（Extended ISA)32位ISA總線。為了適應(yīng)微處理器性能的提高及I/O模塊更高吞吐率的要求，出現(xiàn)了VL-Bus(VESA Local Bus)和PCI(Peripheral Component Interconnect,PCI）總線。適合小型化要求的PCMCIA(Personal Computer Memory Card International Association)總線，用于筆記本計算機的功能擴展。總線的指標(biāo)計算機主機性能迅速提高,各功能模塊性能也要相應(yīng)提高,這對總線性能提出更高的要求。總線主要技術(shù)指標(biāo)有幾方面：總線寬度：一次操作可以傳輸?shù)臄?shù)據(jù)位數(shù)，如S100為8位，ISA為16位，EISA為32位，PCI-2可達64位。總線寬度不會超過微處理器外部數(shù)據(jù)總線的寬度。總數(shù)工作頻率：總線信號中有一個CLK時鐘，CLK越高每秒鐘傳輸?shù)臄?shù)據(jù)量越大。ISA、EISA為8MHz，PCI為33.3MHz, PCI-2可達達66.6MHz。單個數(shù)據(jù)傳輸周期：不同的傳輸方式，每個數(shù)據(jù)傳輸所用CLK周期數(shù)不同。ISA要2個，PCI用1個CLK周期。這決定總線最高數(shù)據(jù)傳輸率。5. 總線的分類與層次系統(tǒng)總線：是微處理器芯片對外引線信號的延伸或映射，是微處理器與片外存儲器及I/0接口傳輸信息的通路。系統(tǒng)總線信號按功能可分為三類：地址總線（Where）：指出數(shù)據(jù)的來源與去向。地址總線的位數(shù)決定了存儲空間的大小。系統(tǒng)總線：數(shù)據(jù)總線（What）提供模塊間傳輸數(shù)據(jù)的路徑，數(shù)據(jù)總線的位數(shù)決定微處理器結(jié)構(gòu)的復(fù)雜度及總體性能。控制總線（When）：提供系統(tǒng)操作所必需的控制信號，對操作過程進行控制與定時。擴充總線：亦稱設(shè)備總線，用于系統(tǒng)I/O擴充。與系統(tǒng)總線工作頻率不同，經(jīng)接口電路對系統(tǒng)總統(tǒng)信號緩沖、變換、隔離，進行不同層次的操作（ISA、EISA、MCA)局部總線：擴充總線不能滿足高性能設(shè)備（圖形、視頻、網(wǎng)絡(luò)）接口的要求，在系統(tǒng)總線與擴充總線之間插入一層總線。由于它經(jīng)橋接器與系統(tǒng)總線直接相連，因此稱之為局部總線（PCI）。
上傳時間： 2013-11-09
上傳用戶：nshark
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