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faq-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(shù) 輸入配線系統(tǒng)可任意選擇 CT比可任意設定具有異常電流值與異常次數(shù)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(wěn)定性高 2.主要規(guī)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(shù): 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(shù)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(huán)境條件 : 0-50℃(20 to 90% RH non-condensed) 存放環(huán)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(shù) 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(guī)劃具有異常值與異常次數(shù)記錄保留功能異常信號過高或過低或范圍內(nèi)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(wěn)定性高 2.主要規(guī)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(shù): 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(shù)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(huán)境條件 : 0-50℃(20 to 90% RH non-condensed) 存放環(huán)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(fā)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
[emuch.net]C++FAQ(很有意思的入門指引)

C++ 語言

標簽： emuch FAQ net

上傳時間： 2014-01-04

上傳用戶：Maple
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
一個支撐矢量機模型庫

一個支撐矢量機模型庫，詳細內(nèi)容參看壓縮包內(nèi)的FAQ

標簽： 矢量模型庫

上傳時間： 2015-03-19

上傳用戶：moerwang
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(tǒng)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(tǒng)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(fā)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