Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a transformer, one option is to swap out the existingtransformer with one that has an additional secondarywinding. The problem with this solution is that manysystems now use transformers that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed transformer with acustom version. An easier alternative is to produce thelow negative voltage rail by stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf transformer with two secondary windingsto produce ±12V, and a –3.3V rail is needed, a negativebuck converter can produce the –3.3V output from the–12V rail.
標(biāo)簽： 458 DN 降壓轉(zhuǎn)換器 低電壓
上傳時(shí)間： 2013-10-09
上傳用戶：Jerry_Chow
使用Win32創(chuàng)建串口通訊程序源代碼：本文的目的是介紹如何在Win32中處理串口。串口通訊可以通過多種技術(shù)實(shí)現(xiàn)，例如：ActiveX,I/O存取和文件操作。本文介紹Win32平臺(tái)下通過文件操作技術(shù)使用串口。程序員可以使用 Microsoft Visual C++ Version 6.0所提供的kernel32.lib。在Microsoft Windows(2000,Me,XP and 95/98)中，串口作為文件處理。因此可以通過Windows文件創(chuàng)建函數(shù)打開串口。文章不僅介紹了串口通訊，也介紹了在串口通訊應(yīng)用程序中實(shí)現(xiàn)多任務(wù)，多任務(wù)可以使串口通訊應(yīng)用程序在同一時(shí)間處理更多的任務(wù)，例如：讀數(shù)據(jù)任務(wù)，發(fā)送數(shù)據(jù)任務(wù)，GUI任務(wù)等。
上傳時(shí)間： 2013-12-12
上傳用戶：dysyase
這是Keil C51 V6.21的安裝程序,有2k代碼大小的限制. 安裝需要先解壓縮到一個(gè)文件夾,比如解到: c:\621 然后運(yùn)行 c:\621\setup\setup.exe 執(zhí)行安裝,安裝時(shí)選擇eval version進(jìn)行安裝.
上傳時(shí)間： 2013-10-27
上傳用戶：851197153
這是keil C51 V7.01的安裝程序,有2k代碼大小的限制. 安裝需要先解壓縮到一個(gè)文件夾,比如解到: c:c51701 然后運(yùn)行 c:c51701setupsetup.exe 執(zhí)行安裝,安裝時(shí)選擇eval version進(jìn)行安裝.
上傳時(shí)間： 2014-01-27
上傳用戶：dreamboy36
安裝方法是先將V6.12安裝程序用復(fù)制到某個(gè)目錄下，如復(fù)制到D:\keilC51 然后執(zhí)行D:\keilC51\setup\setup.exe 安裝程序，選擇安裝Eval Version版進(jìn) 行安裝。
標(biāo)簽： KEIL 完全破解版 免費(fèi)下載
上傳時(shí)間： 2013-11-22
上傳用戶：15071087253
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標(biāo)簽： C8051F020
上傳時(shí)間： 2013-10-12
上傳用戶：lalalal
Important Notice SUNPLUS INNOVATION TECHNOLOGY INC. reserves the right to change this documentation without prior notice. Information provided by SUNPLUS INNOVATION TECHNOLOGY INC. is believed to be accurate and reliable. However, SUNPLUS INNOVATION TECHNOLOGY INC.makes no warranty for any errors which may appear in this document. Contact SUNPLUS INNOVATION TECHNOLOGY INC.to obtain the latest version of device specifications before placing your order. No responsibility is assumed by SUNPLUS INNOVATION TECHNOLOGY INC. for any infringement of patent or other rights of third parties which may result from its use. In addition, SUNPLUSIT products are not authorized for use as critical components in life support systems or aviation systems, where a malfunction or failure of the product may reasonably be expected to result in significant injury to the user, without the express written approval of SunplusIT
標(biāo)簽： SUNPLUSIT Q-Writer 編程工具 使用說明書
上傳時(shí)間： 2013-10-13
上傳用戶：brain kung
Keil C251設(shè)計(jì)軟件V3.11(4k代碼限制） keil c251 v3.11 demo版的安裝說明：安裝方法是先將V3.11安裝程序用winzip解壓縮到某個(gè)目錄下。（不要直接點(diǎn)擊setup.exe安裝），比如解壓縮到c:\c251然后執(zhí)行c:\c251\setup\setup.exe 安裝程序，這個(gè)程序會(huì)讓你選擇安裝Eval Version版還是Full Version版，選擇Eval Version版進(jìn)行安裝 安裝好之后就可以使用，但有代碼大小的限制。需要無限制的版本，請(qǐng)購買正版軟件。 C251是intel公司的16位單片機(jī)，指令兼容51的單片機(jī)。8位單片機(jī)風(fēng)靡了20年，下一個(gè)20年應(yīng)該是16位單片機(jī)的世界。
標(biāo)簽： Keil C251 3.11 設(shè)計(jì)軟件
上傳時(shí)間： 2014-01-23
上傳用戶：yanqie
What is New in C51 Version 8.18[Device Support]Added debug support for the NXP P89LPC9408 in the LPC900 EPM Emulator/Programmer.[New Supported Device]Nuvoton W681308 device.[New Supported Device]NXP P89LPC9201, P89LPC9211, P89LPC922A1, P89LPC9241, P89LPC9251, P89LPC9301, P89LPC931A1, P89LPC9331, P89LPC9341, and P89LPC9351 devices.[New Supported Device]SiLabs C8051F500, C8051F501, C8051F504, C8051F505, C8051F506, C8051F507, C8051F508, C8051F509, C8051F510, and C8051F511 devices.[ULINK2 Support]Corrected potential deadlock on ST uPSD targets.[Device Simulation]Corrected simulation of Infineon XC800 MDU.[Device Simulation]Corrected behaviour of EXFn and TOGn on SiLabs C8051F12x/F13x devices.[Device Simulation]Added simulation for Atmel AT89C51RE2, including simulation of second UART.[Cx51 Compiler]Corrected failed initialization on far addresses when the object is located with _at_. 本資料僅供學(xué)習(xí)評(píng)估之用,請(qǐng)勿用于商業(yè)用途!請(qǐng)?jiān)趯W(xué)習(xí)評(píng)估24小時(shí)內(nèi)刪除.
上傳時(shí)間： 2013-11-01
上傳用戶：panpanpan
This article has been contributed to the TI Developer Wiki. To see the most recently updated version or tocontribute, visit this topic at:
上傳時(shí)間： 2013-11-04
上傳用戶：釣鰲牧馬
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