摘 要:本文針對單片機技術(shù)的發(fā)展概況,結(jié)合我國高校單片機教學(xué)的現(xiàn)狀,簡單闡述了教學(xué)改革的必要性,并提出了幾條教學(xué)改革的具體建議。有一定的探討價值。關(guān)鍵詞:選講型號;開發(fā)語言;網(wǎng)絡(luò)資源;片上系統(tǒng);實踐教學(xué)
上傳時間: 2013-11-07
上傳用戶:18711024007
NXP Semiconductor designed the LPC2400 microcontrollers around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded Trace. The LPC2400 microcontrollers have 512 kB of on-chip high-speedFlash memory. This Flash memory includes a special 128-bit wide memory interface andaccelerator architecture that enables the CPU to execute sequential instructions fromFlash memory at the maximum 72 MHz system clock rate. This feature is available onlyon the LPC2000 ARM Microcontroller family of products. The LPC2400 can execute both32-bit ARM and 16-bit Thumb instructions. Support for the two Instruction Sets meansEngineers can choose to optimize their application for either performance or code size atthe sub-routine level. When the core executes instructions in Thumb state it can reducecode size by more than 30 % with only a small loss in performance while executinginstructions in ARM state maximizes core performance.
上傳時間: 2013-11-15
上傳用戶:zouxinwang
由于近些年來智能電網(wǎng)的大力發(fā)展需求出現(xiàn)了各種自動抄表系統(tǒng)的應(yīng)用方案,但各有不足之處未能真正在我國廣泛采用。為了實現(xiàn)智能電網(wǎng)自動抄表系統(tǒng)的真正應(yīng)用,設(shè)計了一種易于實現(xiàn)的、網(wǎng)絡(luò)開銷小并低功耗的無線網(wǎng)絡(luò),它采用ARM和MCU作為自動抄表系統(tǒng)的無線集中器硬件平臺,并搭配Sub-GHz的射頻收發(fā)模塊,集中器與節(jié)點設(shè)備之間采用自定義協(xié)議的自動組網(wǎng)形式, 可實現(xiàn)50個節(jié)點自動靈活組網(wǎng),而且網(wǎng)絡(luò)開銷小只占用4 k存儲空間。整個系統(tǒng)具有實用性和應(yīng)用性強的特點。
標(biāo)簽: 自動抄表 低功耗 無線 網(wǎng)絡(luò)設(shè)計
上傳時間: 2013-10-17
上傳用戶:fqscfqj
糧食安全一直是人民生活重點關(guān)注的話題,在糧食的儲備過程中,對糧食的溫濕度以及蟲害等的監(jiān)測是保持糧食安全的重要措施。文中設(shè)計了一個通過采用Sub-G Hz頻段和CDMA技術(shù)進行融合的糧情監(jiān)測系統(tǒng),系統(tǒng)將物聯(lián)網(wǎng)與互聯(lián)網(wǎng)聯(lián)合起來,將采集到的數(shù)據(jù)通過CDMA網(wǎng)絡(luò)傳輸?shù)竭h端的PC上,然后通過上位機對數(shù)據(jù)分析后進行相應(yīng)的處理,從而實現(xiàn)對糧食遠程的監(jiān)測與控制。該系統(tǒng)具有傳輸距離遠、成本低和低功耗等特點,具有良好的應(yīng)用前景。
標(biāo)簽: 無線傳感器網(wǎng)絡(luò) 監(jiān)測系統(tǒng)
上傳時間: 2013-12-24
上傳用戶:taiyang250072
Abstract: The process of designing a radio system can be complex and often involves many project tradeoffs. Witha little insight, balancing these various characteristics can make the job of designing a radio system easier. Thistutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on theindustrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems,modulation techniques, cost, antenna options, power-supply influences, effects on range, and protocol selectionare explored.
標(biāo)簽: 無線
上傳時間: 2013-12-13
上傳用戶:eastgan
混合左右手材料的兩個通帶分別出現(xiàn)在2.5 GHz和6 GHz處。通過仿真獲得S11、S21和色散曲線,從理論上驗證了左手特性的存在。具有雙左手頻帶的左手材料將在未來四頻器件中得到廣泛應(yīng)用。
上傳時間: 2013-11-07
上傳用戶:lbbyxmoran
基本的編輯工具(GENERAL EDITING FACILITIES) 對象放置(Object Placement) ISIS支持多種類型的對象,每一類型對象的具體作用和功能將在下一章給出。雖然類型不同,但放置對象的基本步驟都是一樣的。 放置對象的步驟如下(To place an object:) 1.根據(jù)對象的類別在工具箱選擇相應(yīng)模式的圖標(biāo)(mode icon)。 2. Select the sub-mode icon for the specific type of object. 2、根據(jù)對象的具體類型選擇子模式圖標(biāo)(sub-mode icon)。 3、如果對象類型是元件、端點、管腳、圖形、符號或標(biāo)記,從選擇器里(selector)選擇你想要的對象的名字。對于元件、端點、管腳和符號,可能首先需要從庫中調(diào)出。 4、如果對象是有方向的,將會在預(yù)覽窗口顯示出來,你可以通過點擊旋轉(zhuǎn)和鏡象圖標(biāo)來調(diào)整對象的朝向。 5、最后,指向編輯窗口并點擊鼠標(biāo)左鍵放置對象。對于不同的對象,確切的步驟可能略有不同,但你會發(fā)現(xiàn)和其它的圖形編輯軟件是類似的,而且很直觀。 選中對象(Tagging an Object) 用鼠標(biāo)指向?qū)ο蟛Ⅻc擊右鍵可以選中該對象。該操作選中對象并使其高亮顯示,然后可以進行編輯。
上傳時間: 2013-10-29
上傳用戶:avensy
This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent Representation of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL Data Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production data and the subsequent productionof hardware. Most VHDL modeling performed to date has been concentrated at either the component level orat the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an attempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the format A configuration. Although these modules are quitesimple, it is felt that the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
標(biāo)簽: Modelling Guide Navy VHDL
上傳時間: 2013-11-20
上傳用戶:pzw421125
基本的編輯工具(GENERAL EDITING FACILITIES) 對象放置(Object Placement) ISIS支持多種類型的對象,每一類型對象的具體作用和功能將在下一章給出。雖然類型不同,但放置對象的基本步驟都是一樣的。 放置對象的步驟如下(To place an object:) 1.根據(jù)對象的類別在工具箱選擇相應(yīng)模式的圖標(biāo)(mode icon)。 2. Select the sub-mode icon for the specific type of object. 2、根據(jù)對象的具體類型選擇子模式圖標(biāo)(sub-mode icon)。 3、如果對象類型是元件、端點、管腳、圖形、符號或標(biāo)記,從選擇器里(selector)選擇你想要的對象的名字。對于元件、端點、管腳和符號,可能首先需要從庫中調(diào)出。 4、如果對象是有方向的,將會在預(yù)覽窗口顯示出來,你可以通過點擊旋轉(zhuǎn)和鏡象圖標(biāo)來調(diào)整對象的朝向。 5、最后,指向編輯窗口并點擊鼠標(biāo)左鍵放置對象。對于不同的對象,確切的步驟可能略有不同,但你會發(fā)現(xiàn)和其它的圖形編輯軟件是類似的,而且很直觀。 選中對象(Tagging an Object) 用鼠標(biāo)指向?qū)ο蟛Ⅻc擊右鍵可以選中該對象。該操作選中對象并使其高亮顯示,然后可以進行編輯。
上傳時間: 2013-11-09
上傳用戶:2525775
如果已經(jīng)安裝好了vobsub,就可以運用vobsub里面帶的字幕提取工具vsrip提取字幕。 打開VobSub程序組,運行vobsub.configure,點擊Open來打開vts_01_0.ifo文件(此文件已經(jīng)拷貝到硬盤上,無需從光盤上找),選定放置字幕文件的子目錄,點擊確定.提取完成之后會生成Vts_01_0.sub和vts_01_0.idx兩個字幕文件,若按照DVDrip的做法是在最終視頻文件生成之后,將字幕文件更名并與主體一致,但在此這個步驟被提前了,因為real格式文件的字幕是嵌入在畫面那的.我們需要做的是將vts_01_0.idx和vts_01_0.sub更名為vts_01_1.idx和vts_01_1.sub,與vts_01_1.vob同名.這樣才能進行制作時被vobsub自動調(diào)用同步嵌入字幕
標(biāo)簽: vobsub
上傳時間: 2015-04-28
上傳用戶:wangdean1101
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