1.利用I/O口产生一定频率的方波，驱动蜂鸣器，发出不同的音调，从而演奏乐曲（最少三首乐曲，每首不少于30秒） 2．采用LCD显示信息 3．开机时有英文欢迎提示字符，播放时显示歌曲序号（或名称） 4．可通过功能键选择乐曲，暂停，播放。 5．选作内容：显示乐曲播放时间或剩余时间
上传时间： 2016-01-24
上传用户：BIBI
I have a dream that I am always young. Then I will have enough energy to do everything whenever I want. Moreover, I don t have to worry about the old age during which I even can t take care of myself
标签： have everything whenever always
上传时间： 2016-01-24
上传用户：whenfly
本简易网络导纳分析仪以C8051F020为控制和数据处理核心，由正弦信号发生器模块、滤波和功率放大模块、I/V变换模块、导纳角测量模块、导纳模测量模块、键盘模块以及液晶显示模块组成。采用数字控制DDS芯片AD9851产生100Hz－10KHz正弦信号，经滤波和功率放大后驱动网络负载。从网络负载中提取被测量信号，输入到以真有效值转换集成芯片AD637为核心的电压和电流测量电路构成的导纳模测量模块中进行导纳模测量。导纳角测量模块是从导纳模测量模块中取电压和电流信号分别经过零比较后使用鉴相器对信号相位差测量。把上述的测量结果经单片机处理后用液晶显示。为了提高测量精度，将各部分电路的误差合理分配，使电路达到最佳测量效果。
上传时间： 2014-09-06
上传用户：JIUSHICHEN
I use C to implement thread operating,include initiallize,fork,yield,exit,kill. You should have driver to use this library. I choose array for ready queue,and strcut for Thread Control Block.
标签： initiallize implement operating include
上传时间： 2016-01-26
上传用户：xc216
Welcome to the Wrox Press C++ tutorial "I hope you ll enjoy reading this tutorial with your portable, your work, or your home PC. It s a perfect companion to the Introduction to Visual C++ 6.0 Standard Edition manual and is a proven aid to understanding the C++ language. The material in this tutorial is adapted from my book Beginning Visual C++ 6.0, to provide you with a thorough grounding in pure C++. I ve been careful to address the new standards in C++ laid out by the ANSI and ISO committees and I encourage you to adopt these conventions so that your programs are maintainable for years to come.
标签： tutorial Welcome reading portabl
上传时间： 2016-01-26
上传用户：wsf950131
Compress - SuperFast Packer v.3.0.zip
标签： SuperFast Compress Packer zip
上传时间： 2016-01-27
上传用户：xaijhqx
weiifnvfn j nbfjdbnnbnbvfknvn v
标签： nbfjdbnnbnbvfknvn weiifnvfn
上传时间： 2013-12-18
上传用户：asddsd
This the e-book of "programming Visual C++ .Net sixth version" I check others on your website do not contain source codes.
标签： programming version website e-book
上传时间： 2014-01-15
上传用户：xcy122677
this api for java to do the network managerment of system,i like it ,so share for a
标签： managerment for network system
上传时间： 2016-02-02
上传用户：libinxny
this is a book for xfire and spring,I like it ,share it for a
上传时间： 2016-02-02
上传用户：a6697238
