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Modified

  • 87C576微控制器的在線編程

    The 87C576 includes two separate methods of programming theEPROM array, the traditional Modified Quick-Pulse method, and anew On-Board Programming technique (OBP).Quick Pulse programming is a method using a number of devicepins in parallel (see Figure 1) and is the traditional way in which87C51 family members have been programmed. The Quick-Pulsemethod supports the following programming functions:– program USER EPROM– verify USER EPROM– program KEY EPROM– program security bits– verify security bits– read signature bytesThe Quick-Pulse method is quite easily suited to standardprogramming equipment as evidenced by the numerous vendors of87C51 compatible programmers on the market today. Onedisadvantage is that this method is not well suited to programming inthe embedded application because of the large number of signallines that must be isolated from the application. In addition, parallelsignals from a programmer would need to be cabled to theapplication’s circuit board, or the application circuit board wouldneed to have logic built-in to perform the programming functions.These requirements have generally made in-circuit programmingusing the Modified Quick Pulse method impractical in almost all87C51 family applications.

    標簽: 87C576 微控制器 編程

    上傳時間: 2013-10-21

    上傳用戶:xiaozhiqban

  • 微電腦型交流電流異常警報電表

    特點 精確度0.25%滿刻度 ±1位數 輸入配線系統可任意選擇 CT比可任意設定 具有異常電流值與異常次數記錄保留功能 電流過高或過低檢測可任意設定 報警繼電器復歸方式可任意設定 尺寸小,穩定性高 2.主要規格 輔助電源: AC110V&220V ±20%(50 or 60Hz) AC220V&440V ±20%(50 or 60Hz)(optional) 精確度: 0.25% F.S. ±1 digit 輸入負載: <0.2VA (Current) 最大過載能力 : Current related input: 2 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1 sec. 輸入電流范圍: AC0-5A (10-1000Hz) CT ratio : 1-2000 adjustable 啟動延遲動作時間: 0-99.9 second adjustable 繼電器延遲動作時間: 0-99.9 second adjustable 繼電器復歸方式: Manual (N) / latch(L) can be Modified 繼電器磁滯范圍: 0-999 digit adjustable 繼電器動作方向: HI /LO/GO/HL can be Modified 繼電器容量: AC 250V-5A, DC 30V-7A 過載顯示: "doFL" 溫度系數: 50ppm/℃ (0-50℃) 顯示幕: Red high efficiency LEDs high 14.22mm(.56")(PV) Red high efficiency LEDs high 14.22mm(.276")(NO) 參數設定方式: Touch switches 記憶型式 : Non-volatile E2PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc(input/output 使用環境條件 : 0-50℃(20 to 90% RH non-condensed) 存放環境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001

    標簽: 微電腦 交流電流 警報電表

    上傳時間: 2013-10-14

    上傳用戶:wanghui2438

  • 微電腦型盤面式異常警報電表

    特點 精確度0.1%滿刻度 ±1位數 可量測 交直流電流/交直流電壓/電位計/傳送器/Pt-100/荷重元/電阻 等信號 顯示范圍-1999-9999可任意規劃 具有異常值與異常次數記錄保留功能 異常信號過高或過低或范圍內或范圍外檢測可任意設定 報警繼電器復歸方式可任意設定 尺寸小,穩定性高 2.主要規格 精確度: 0.1% F.S. ±1 digit 0.2% F.S. ±1 digit(AC) 取樣時間: 16 cycles/sec. 顯示值范圍: -1999 - +9999 digit adjustable 啟動延遲動作時間: 0-99.9 second adjustable 繼電器延遲動作時間: 0-99.9 second adjustable 繼電器復歸方式: Manual (N) / latch(L) can be Modified 繼電器動作方向: HI /LO/GO/HL can be Modified 繼電器容量: AC 250V-5A, DC 30V-7A 過載顯示: "doFL" 溫度系數: 50ppm/℃ (0-50℃) 顯示幕: Red high efficiency LEDs high 14.22mm(.56")(PV) Red high efficiency LEDs high 7.0mm(.276")(NO) 參數設定方式: Touch switches 記憶型式 : Non-volatile E2PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc(input/output 使用環境條件 : 0-50℃(20 to 90% RH non-condensed) 存放環境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001

    標簽: 微電腦 警報電表

    上傳時間: 2013-11-02

    上傳用戶:fandeshun

  • MAX7060的ASK_FSK的ISM射頻發射機

    Abstract: This application note illustrates the flexibility of the MAX7060 ASK/FSK transmitter. While the currently available evaluationkit (EV kit) has been optimized for the device's use in a specific frequency band (i.e., 288MHz to 390MHz), this document addresseshow the EV kit circuitry can be Modified for improved operation at 433.92MHz, a frequency commonly used in Europe. Twoalternative match and filter configurations are presented: one for optimizing drain efficiency, the other for achieving higher transmitpower. Features and capabilities of earlier Maxim industrial, scientific, and medical radio-frequency (ISM-RF) transmitters areprovided, allowing comparison of the MAX7060 to its predecessors. Several design guidelines and cautions for using the MAX7060are discussed.

    標簽: ASK_FSK 7060 MAX ISM

    上傳時間: 2013-11-14

    上傳用戶:swaylong

  • 開關電源EMI設計(英文版)

    Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are Modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.

    標簽: EMI 開關電源 英文

    上傳時間: 2013-11-16

    上傳用戶:萍水相逢

  • This an adaptive receiver for a direct-sequence spread spectrum (DS-SS) system over an AWGN channel.

    This an adaptive receiver for a direct-sequence spread spectrum (DS-SS) system over an AWGN channel. The adaptive receiver block is Modified from the LMS adaptive filter block in DSP Blockset. For DS-SS signal reception, the adaptive filter needs to have multi-rate operation. The input sample rate is equal to chip rate and the output is at symbol rate. Two rates are related by PG, processing gain

    標簽: direct-sequence adaptive receiver spectrum

    上傳時間: 2014-01-16

    上傳用戶:D&L37

  • 51單片機系統中運用電腦上的大鍵盤! Keyboard接線 PS/2--------51 1 DATA------P3.4 3 GND 4 VCC 5 CLK-------P3.3 接在51的外部中斷

    51單片機系統中運用電腦上的大鍵盤! Keyboard接線 PS/2--------51 1 DATA------P3.4 3 GND 4 VCC 5 CLK-------P3.3 接在51的外部中斷,觸發方式為低電平 AT89x51使用12M Modified by Shen Peng! Postgraduate of 2003, 7 Department Harbin Engineering University

    標簽: Keyboard DATA 3.4 3.3

    上傳時間: 2013-12-19

    上傳用戶:宋桃子

  • This version of the code is compatible only with the AT89C2051 due to the location of the data buf

    This version of the code is compatible only with the AT89C2051 due to the location of the data buffer and stack in RAM. The code may be Modified to work with the AT89C1051 by relocating or resizing the buffer and stack to fit into the smaller amount of RAM available in the AT89C1051.

    標簽: the compatible location version

    上傳時間: 2015-04-05

    上傳用戶:changeboy

  • 這是一個不到2000行的操作系統

    這是一個不到2000行的操作系統,巧妙地利用ARM9 CPU的內存管理單元(MMU)實現進程的切換。ARM9的4G虛擬地址可分成128個進程空間,每個32M。雖然它們的虛擬地址(VA)都是0-(32M-1),但是對應的MVA(Modified vitual address,由虛擬地址VA和進程號PID組合而來)不一樣,設置MVA對應的頁表指向不同物理地址就可以很方便地讓各進程運行空間相互隔開。代碼很少,注釋豐富,希望能對想理解操作系統、了解ARM體系結構的朋友有所幫助。

    標簽: 2000 操作系統

    上傳時間: 2015-04-12

    上傳用戶:cainaifa

  • FIR Filter Design(有限沖擊響應濾波器設計)

    FIR Filter Design(有限沖擊響應濾波器設計),包括ideal bandpass filter impulse response、Modified Bessel function、Kaiser window parameters for spectral analysis等12種FIR設計matlab源代碼

    標簽: Design Filter FIR 響應濾波器

    上傳時間: 2015-05-20

    上傳用戶:Miyuki

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