方波逆变器在输出失真度最小时波形最接近正弦波。采用功率谱分析的方法, 得出了单相方波逆变器谐波失真度最小时的脉宽数值。对于固定脉宽系统, 导通角取21331 rad 时最佳; 对于变脉宽系统, 导通角变化区间两端失真度相等时, 系统的平均失真最小。该结论在光伏电站控制系统电源的设计中得到了应用与验证。
上传时间： 2013-11-29
上传用户：Aeray
显卡所处理的信息最终都要输出到显示器上，显卡的输出接口就是电脑不显示器之间的桥梁，它负责向显示器输出相应的图像信号。CRT显示器因为设计制造上的原因，只能接受模拟信号输入，这就需要显卡能输入模拟信号。VGA接口就是显卡上输出模拟信号的接口，VGA（Video Graphics Array）接口，也叫D-Sub接口。虽然液晶显示器可以直接接收数字信号，但为了兼容性，大多数液晶显示器也配备了VGA接口。 VGA是IBM在1987年随PS／2机一起推出的一种视频传输标准，具有分辨率高、显示速率快、颜色丰富等优点，在彩色显示器领域得到了广泛的应用。目前VGA技术的应用还主要基亍VGA显示卡的计算机、笔记本等设备。 根据分辨率丌同，VGA分为VGA（640x480）、SVGA（800x600）、XGA（1024x768）、SXGA（1280x1024）等。
上传时间： 2013-10-22
上传用户：macarco
本内容详细介绍了传统MCU开发工具 云计算时代的新需要 基于云计算的MCU开发 COOCOX TOOLS
上传时间： 2013-12-25
上传用户：ls530720646
The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control signals over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.
上传时间： 2014-01-24
上传用户：xingisme
为解决传统可视倒车雷达视频字符叠加器结构复杂，可靠性差，成本高昂等问题，在可视倒车雷达设计中采用视频字符发生器芯片MAX7456。该芯片集成了所有用于产生用户定义OSD，并将其插入视频信号中所需的全部功能，仅需少量的外围阻容元件即可正常工作。给出了以MAX7456为核心的可视倒车雷达的软、硬件实现方案及设计实例。该方案具有电路结构简单、价格低廉、符合人体视觉习惯的特点。经实际装车测试，按该方案设计的可视倒车雷达视场清晰、提示字符醒目、工作可靠，可有效降低驾驶员倒车时的工作强度、减少倒车事故的发生。 Abstract: A new video and text generation chip，MAX7456，was used in the design of video parking sensor in order to simplify system structure，improve reliability and reduce cost. This chip included all the necessary functions to generate user-defined OSDs and to add them into the video signals. It could be put into work with addition of just a small number of resistances and capacitors. This paper provided software and hardware implementation solutions and design example based on the chip. The system had the characteristics of simplicity in circuit structure，lower cost，and comfort for the nature of human vision. Loading road test demonstrates high video and text display quality and reliable performance，which makes the driver easy to see backward and reduces chance of accidents.
上传时间： 2013-12-10
上传用户：qiaoyue
The MSP-FET430PIF is a Parallel Port interface (does not include target board) that is used to program and debug MSP430 FET tools and test boards through the JTAG interface. This interface is included in our FET tools, but sold without the development board. This interface uses a Parallel PC Port to communicate to the Debugger Software (IAR Kickstart software included) running on the PC. The interface uses the standard 14 pin header to communicate to the MSP430 device using the standard JTAG protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is extremely low power, no external power supply is required. The tool has an integrated software environment and connects directly to the PC which greatly simplifies the set-up and use of the tool. The flash development tool supports development with all MSP430 flash parts. Features MSP430 debugging interface to connect a MSP430-Flash-device to a Parallel port on a PC Supports JTAG debug protocol (NO support for Spy-Bi-Wire (2-wire JTAG) debug protocol, Spy-Bi-Wire (2-wire JTAG) is supported by MSP-FET430UIF) Parallel Port cable and a 14-conductor target cable Full documentation on CD ROM Integrated IAR Kickstart user interface which includes: Assembler Linker Limulator Source-level debugger Limited C-compiler Technical specifications: Backwardly compatable with existing FET tool boards.
上传时间： 2013-10-26
上传用户：fengweihao158@163.com
The MSP-FET430U14 is a powerful flash emulation tool to quickly begin application development on the MSP430 MCU. It includes USB debugging interface used to program and debug the MSP430 in-system through the JTAG interface or the pin saving Spy Bi-Wire (2-wire JTAG) protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is ultra-low power, no external power supply is required. The debugging tool interfaces the MSP430 to the included integrated software environment and includes code to start your design immediately. The MSP-FET430UIF development tools supports development with all MSP430 flash devices
上传时间： 2013-10-28
上传用户：13691535575
CCAVR软件有ISP功能，能过调用STK500完成的，只要设置好参数，在ICCAVR中就可以给芯片编程了，还可以让程序一编译完就自动下载到芯片中，相当方便。在Tools->environment options->ISP里设定STK500.exe的路径。— 用于调用STK500程序。在Tools->In system programming 里Programmer Interface中选中STK500。— 选择STK500下载方式。在Tools->In system programming 里把Auto Program After Compile 的小勾选上。— 编译后自动编程。在Tools->In system programming 中还有一些设置项，大家可以根据需要进行相关设置。下面的图片是操作过程。
上传时间： 2013-11-17
上传用户：joseph
ICCAVR简介ICCAVR 是一种使用ANSI 标准C 语言来开发微控制器（MCU）程序的一个工具，它是一个综合了编辑器和工程管理器的集成工作环境（IDE）。源文件全部被组织到工程之中，文件的编辑和工程（project）的构筑也在IDE 的环境中完成。编译错误在状态窗口中显示，用鼠标单击编译错误时，光标会自动跳转到出错行。这个工程管理器还能直接产生INTEL HEX格式的烧写文件和可以在AVR Studio 中调试的COFF 格式的调试文件。这里特别要提一下ICCAVR 中的应用构筑向导，可以在Tools 栏中选择“ApplicationBiulder”或者直接点击快捷工具栏中的“Application Biulder”图标，就可以打开应用构筑向导对话框，可以根据需要设定芯片种类，各个端口初始值，是否使用定时器，中断，UART等，选好以后单击“OK”就可以得到所需的硬件初始化程序段，非常可靠而且方便。图1给出了初始化UART 的一个例子：下面介绍一下创建并编译一个工程文件的简要步骤：1．新建一个源文件从file 菜单中选择new，创建一个新文件，在改文件中输入源程序并进行编辑和修改，然后存盘，在存盘时必须指定文件类型，如命名为：try.c 。写一个新文件的步骤：首先用Biulder 初始化需要用到的硬件资源，生成初始化程序，然后再写需要的代码实现所要的功能。2．新建一个project从projrct 菜单中选择new 命令，IDE 会弹出一个对话框，在对话框中用户可以指定工程存放的文件夹和工程的名称。在建立一个新工程之后，在工程管理器的窗口会出现三个子目录，Files, Headers, Documents,这时就可以将要编译的文件添加到project 中了。3．把文件添加到工程中可以在project-files 里单击右键，选择需要添加的文件；也可以在编辑窗口中单击右键选择弹出窗口的“Add To Project”命令。4．编译源文件在编译之前特别要注意在Project Options 中选择与硬件相应的芯片。如本次实验就选择ATMEGA8515,如图2 所示。在project 中选择make project,也可以直接单击快捷键F9，这时要是有错则会弹出出错信息，修改调试正确以后单击快捷键ISP 就可以烧写到硬件中去了。
标签： ICCAVR
上传时间： 2013-10-25
上传用户：569342831
MPLAB C30用户指南(英文) HIGHLIGHTSThe information covered in this chapter is as follows:• About this Guide• Recommended Reading• Troubleshooting• The Microchip Web Site• Development Systems Customer Notification Service• Customer Support Document LayoutThe document layout is as follows:• Chapter 1: Compiler Overview – describes MPLAB C30, development tools andfeature set.• Chapter 2: Differences between MPLAB C30 and ANSI C – describes thedifferences between the C language supported by MPLAB C30 syntax and thestandard ANSI-89 C.• Chapter 3: Using MPLAB C30 – describes how to use the MPLAB C30 compilerfrom the command line.• Chapter 4: MPLAB C30 Runtime Environment – describes the MPLAB C30runtime model, including information on sections, initialization, memory models, thesoftware stack and much more.• Chapter 5: Data Types – describes MPLAB C30 integer, floating point and pointerdata types.• Chapter 6: Device Support Files – describes the MPLAB C30 header and registerdefinition files, as well as how to use with SFR’s.• Chapter 7: Interrupts – describes how to use interrupts.• Chapter 8: Mixing Assembly Language and C Modules – provides guidelines tousing MPLAB C30 with MPLAB ASM30 assembly language modules.
上传时间： 2013-10-21
上传用户：13925096126
