PIC16C54C为8位单片机,指令字长12位,全部指令都是单字节指令,系统为哈佛结构,数据总线和程序总线各自独立分开,数据总线宽度为8位,程序总线宽度为12位,内部程序存储器为512×12位,内部数据寄存器为32×8位。 PIC16C54C有12根双向可独立编程I/O引脚,分为PortA和PortB两个端口,其中PortA为RA0~RA3,PortB为RB0~RB7,每根I/O引脚可由程序来编程决定其输入输出方向。 PIC16C54C提供四种可选振荡方式: - RC,低成本的阻容振荡方式 - XT,标准晶体/陶瓷振荡 - HS,高速晶体/陶瓷振荡 - LP,低功耗,低频晶体振荡 更多锁相环知识请访问 http://www.elecfans.com/zhuanti/PLL.html
上传时间: 2013-12-23
上传用户:dianxin61
摘要! 就如何使用单片机对旋转增量编码器鉴相进行了研究! 给出了常用的鉴相算法以及识 别"毛刺#的方法!并通过在!AVR单片机上编程验证了所给出的鉴相方法$ 更多编码器知识请访问http://www.elecfans.com/zhuanti/20111111242149.html
上传时间: 2013-11-16
上传用户:wojiaohs
实用单片机系统是基于MCU8051硬件平台下开发的一款操作平台,它不是一个操作系统,而是一个操作平台,主要借鉴了操作系统、手机的一些概念,比如消息机制、系统时钟、软件定时器、平台等概念。 实用单片机系统的核心理念是:在一个标准化的硬件基础上(如8051,avr,arm等)扩展一个标准化的软件平台,把常规项目常用的一些功能如串口通讯、串口调试、系统定时器、软件定时器、按键界面处理等通过消息机制组织起来,形成一个完整的系统。当一个特定的项目需要增加或者删除一项具体的功能时,只需要在平台上增加或者去掉相应的功能即可,这样项目不需要每次重新构思架构,也不需要从零开始,并且原有的系统通过各个项目沉淀后,更加稳定可靠,这就是平台的概念,它不是各个子函数的集合。 相对于现在的很多人把RTOS操作系统应用于MCU来说,往往只为了实现任务的调度转换而不考虑功能的实用、易用性,此外因其较高的资源占用性导致其不适合在MCU类低资源的嵌入式平台应用,MS系统相对于这些RTOS来说,首先还是保留了编程者的常规前后台思维,但又加了一些RTOS的优点,如软件定时器实现的时间片任务系统,类似RTOS的任务,其次为编程者实现了整个程序的框架和一些常用的函数及接口功能如按键、串口、时钟等,让编程者把精力放在跟项目相关的地方,甚至不需要关心所用MCU的寄存器配置,再次就是代码非常简单,容易学习,尤其是建议大家采用SourceInsight查看程序,远比keil编辑器的功能强,它是C语言下最好的编辑器。而MS3.21版本,建议大家直接在Keil的软件仿真器下运行学习。 MS资料可以从以下网址下载:http://www.study-bbs.com/thread-46471-1-1.html读者有什么疑问也可以在这个版面提问,作者将尽力解释。目前MS3.21版本增加了一个GUI操作框架,相比目前已有的GUI更加简单易懂,利用一个函数指针代替了复杂的状态机,每一个界面由一个界面建立函数和一个执行函数构成即可。
上传时间: 2013-10-29
上传用户:txfyddz
教你写Makefile 什么是makefile?或许很多Winodws的程序员都不知道这个东西,因为那些Windows的IDE都为你做了这个工作,但我觉得要作一个好的和professional的程序员,makefile还是要懂。这就好像现在有这么多的HTML的编辑器,但如果你想成为一个专业人士,你还是要了解HTML的标识的含义。特别在Unix下的软件编译,你就不能不自己写makefile了,会不会写makefile,从一个侧面说明了一个人是否具备完成大型工程的能力。
标签: Makefile
上传时间: 2013-10-12
上传用户:zhoujunzhen
中文版详情浏览:http://www.elecfans.com/emb/fpga/20130715324029.html Xilinx UltraScale:The Next-Generation Architecture for Your Next-Generation Architecture The Xilinx® UltraScale™ architecture delivers unprecedented levels of integration and capability with ASIC-class system- level performance for the most demanding applications. The UltraScale architecture is the industr y's f irst application of leading-edge ASIC architectural enhancements in an All Programmable architecture that scales from 20 nm planar through 16 nm FinFET technologies and beyond, in addition to scaling from monolithic through 3D ICs. Through analytical co-optimization with the X ilinx V ivado® Design Suite, the UltraScale architecture provides massive routing capacity while intelligently resolving typical bottlenecks in ways never before possible. This design synergy achieves greater than 90% utilization with no performance degradation. Some of the UltraScale architecture breakthroughs include: • Strategic placement (virtually anywhere on the die) of ASIC-like system clocks, reducing clock skew by up to 50% • Latency-producing pipelining is virtually unnecessary in systems with massively parallel bus architecture, increasing system speed and capability • Potential timing-closure problems and interconnect bottlenecks are eliminated, even in systems requiring 90% or more resource utilization • 3D IC integration makes it possible to build larger devices one process generation ahead of the current industr y standard • Greatly increased system performance, including multi-gigabit serial transceivers, I/O, and memor y bandwidth is available within even smaller system power budgets • Greatly enhanced DSP and packet handling The Xilinx UltraScale architecture opens up whole new dimensions for designers of ultra-high-capacity solutions.
标签: UltraScale Xilinx 架构
上传时间: 2013-11-13
上传用户:瓦力瓦力hong
中文版详情浏览:http://www.elecfans.com/emb/fpga/20130715324029.html Xilinx UltraScale:The Next-Generation Architecture for Your Next-Generation Architecture The Xilinx® UltraScale™ architecture delivers unprecedented levels of integration and capability with ASIC-class system- level performance for the most demanding applications. The UltraScale architecture is the industr y's f irst application of leading-edge ASIC architectural enhancements in an All Programmable architecture that scales from 20 nm planar through 16 nm FinFET technologies and beyond, in addition to scaling from monolithic through 3D ICs. Through analytical co-optimization with the X ilinx V ivado® Design Suite, the UltraScale architecture provides massive routing capacity while intelligently resolving typical bottlenecks in ways never before possible. This design synergy achieves greater than 90% utilization with no performance degradation. Some of the UltraScale architecture breakthroughs include: • Strategic placement (virtually anywhere on the die) of ASIC-like system clocks, reducing clock skew by up to 50% • Latency-producing pipelining is virtually unnecessary in systems with massively parallel bus architecture, increasing system speed and capability • Potential timing-closure problems and interconnect bottlenecks are eliminated, even in systems requiring 90% or more resource utilization • 3D IC integration makes it possible to build larger devices one process generation ahead of the current industr y standard • Greatly increased system performance, including multi-gigabit serial transceivers, I/O, and memor y bandwidth is available within even smaller system power budgets • Greatly enhanced DSP and packet handling The Xilinx UltraScale architecture opens up whole new dimensions for designers of ultra-high-capacity solutions.
标签: UltraScale Xilinx 架构
上传时间: 2013-11-21
上传用户:wxqman
基于VHDL的FPGA和Nios II 实例精炼【作者:刘福奇;出版社:北京航空航天大学出版社】(本书优酷视频地址:http://www.youku.com/playlist_show/id_5882081.html) 内容简介:本书分为4个部分:Quartus Ⅱ软件的基本操作、VHDL语法介绍、FPGA设计实例和Nios Ⅱ设计实例;总结了编者几年来的FPGA设计经验,力求给初学者或是想接触这方面知识的读者提供一种快速入门的方法;适合电子相关专业的大学生、FPGA的初学者以及对FPGA有兴趣的电子工程师。初学者可以按照步骤学习。本书中提及到时间计算问题,不光提出有时间戳的方法, 还介绍了一种通过读取定时器的寄存器来计算时间的方法。其实,有人认为,本书最好的部分是:DMA的实现说明(本书从3个方面讲述了DMA的使用)。现在学习Verilog HDL的人或许比较多,但是用VHDL的人可以学习下,这本书还是很不错的。
上传时间: 2014-07-10
上传用户:米米阳123
LineWatcher dials your ISP, keeps your connection alive and logs errors. Originally distributed as freeware, this program counts over 10.000 downloads since its first release in 2001. See home page http://www.reseau.org/linewatcher/index.html
标签: your LineWatcher distributed connection
上传时间: 2015-01-10
上传用户:songyue1991
This simple SDI Notepad-like application demonstrates how, taking advantage of the MFC support for Unicode, to Turkmenize labels of the specified menu items. Actually, Turkmen is not supported by Windows 2000, therefore, to create such resources as menu so that strings in Turkmen could be displayed I had to invent an additional technique 这是一个与记事本类似的简单的SDI应用程序,演示了怎样使用MFC来支持 Unicode,对指定的菜单条目进行Turkmenize标签化。实际上,Windwos 2000并不支持Turknen,因此,创建了那些菜单资源以便那些字符串可以在Turknen中显示,为此我必须开发其它的技术。 来源: http://www.codeguru.com/advancedui/SDI_Note.html
标签: Notepad-like demonstrates application advantage
上传时间: 2013-11-26
上传用户:txfyddz
I have written this article to capture a Windows image into a bitmap file that will support all PaintBrush tools and Thumbnail Views of Windows Explorer. I have found many programmers suffering from this problem, including me, until I wrote this article. 捕获一个窗口图像并存入一个支持MS画笔的位图文件中 我写的这篇文章介绍了捕获一个窗口图像并存入一个支持所有画笔和Windows Explorer的位图文件中。 我发现许多程序员因这个问题而烦恼,包括我在内,直到我写了这篇文章。 来源: http://www.codeguru.com/bitmap/WndToBmpFile.html
标签: article Windows capture written
上传时间: 2015-01-10
上传用户:hzy5825468