Flash存储器又称闪存，它结合了ROM和RAM的长处，不仅具备电子可擦除可编程（EEPROM）的性能，还可以快速读取数据（NVRAM的优势），使数据不会因为断电而丢失。U盘和MP3里用的就是这种存储器。在过去的20年里，嵌入式系统一直使用ROM（EPROM）作为它们的存储设备，然而近年来Flash全面代替了ROM（EPROM）在嵌入式系统中的地位，用作存储Bootloader以及操作系统或者程序代码
Flash memory also known as flash, it combines the strengths of ROM and ram, not only have the electronic erasable programming (EEPROM) performance, but also can quickly read data (NVRAM), so that the data is not lost due to power outages. This kind of memory is used in the U disk and MP3. In the past 20 years, embedded system has been using ROM (EPROM) as their storage devices. However, in recent years, flash instead of a comprehensive ROM (EPROM) position in embedded system, used for storage of bootloader and operating system or program code, or directly when the use of hard disk (2016-05-05, TEXT, 1KB, 下载1次)
I2C（Inter－Integrated Circuit）总线是由PHILIPS公司开发的两线式串行总线，用于连接微控制器及其外围设备。是微电子通信控制领域广泛采用的一种总线标准。它是同步通信的一种特殊形式，具有接口线少，控制方式简单，器件封装形式小，通信速率较高等优点。I2C 总线支持任何IC 生产过程(CMOS、双极性）。通过串行数据（SDA）线和串行时钟 （SCL）线在连接到总线的器件间传递信息。每个器件都有一个唯一的地址识别（无论是微控制器——MCU、LCD 驱动器、存储器或键盘接口），而且都可以作为一个发送器或接收器（由器件的功能决定）。LCD 驱动器只能作为接收器，而存储器则既可以接收又可以发送数据。除了发送器和接收器外，器件在执行数据传输时也可以被看作是主机或从机（见表1）。主机是初始化总线的数据传输并产生允许传输的时钟信号的器件。此时，任何被寻址的器件都被认为是从机。
Bus is developed by PHILIPS two wire serial bus, used to connect the microcontroller and its peripheral equipment. Is a kind of bus standard, which is widely used in the field of microelectronic communication control. It is a special form of synchronous communication, which has the advantages of less interface line, simpler control mode, less packaging form and higher communication speed. I2C Bus supports any IC production process (CMOS, bipolar). Transfer information between devices connected to the bus through the serial data (SDA) and serial clock (SCL) lines. Each device has a unique address recognition (both micro controller, MCU, LCD driver, memory or keyboard interface), and can be as a transmitter or receiver is determined by the function of the device. The LCD driver can only be used as a receiver, and the memory can receive and send data. In addition to the transmitter and receiver, the device may also be viewed as a host or slave when performing data transmission (see Table (2016-05-05, TEXT, 2KB, 下载1次)
1 SI CANopen与台达变频器的通讯测试
1 SI CANopenAnd in the inverter testing of communication
(2016-01-08, TEXT, 3291KB, 下载4次)
利用8088/86CPU控制8251A可编程串行通信控制器，实现两个实验台之间的串行通讯。其中一个实验台作为发送方，另一侧为接收方。发送方读入按键值，并发送给接收方，接收方收到数据后在LED上显示。
8088/86CPU control 8251A programmable serial communication controller, serial communication between the two experiments. One of the experiments as the sender, the other side is the receiver. Read key value of the sender, and sent to the receiver, the receiver receives data displayed on the LED.
(2015-06-15, TEXT, 2KB, 下载1次)
用51开发的带有存储器功能的数字温度计－DS1624 可以直接参考或移植
Developed with 51-DS1624 digital thermometer with memory function can be directly reference or transplant (2014-01-04, TEXT, 28KB, 下载2次)
KEIL C51开发的6位数显频率计数器，供大家学习参考
KEIL C51 developed 6-digit frequency counter for everyone to learn reference (2014-01-04, TEXT, 18KB, 下载1次)
HSPICE 全加全减器设计 带波形仿真文件 超大规模集成电路设计
HSPICE full adder full subtracter design with VLSI design of the simulation waveform files (2012-05-23, TEXT, 187KB, 下载32次)
DS1302DS1302 LED 定闹钟 修改日期年份 六位LED数码管显示 配合蜂鸣器 带备用电源考非得要二十个字
DS1302DS1302 LED alarm clock modified LED digital display of six years with the buzzer with a standby power test have to be twenty words (2011-01-09, TEXT, 1KB, 下载1次)
MCP2515文档 芯片介绍 can收发器
Document MCP2515 transceiver chip can introduce (2010-06-02, TEXT, 566KB, 下载22次)
基于DDS的信号发生器的设计，采用LCD进行显示。
Based on the design of DDS signal generator, with LCD display. (2010-05-18, TEXT, 3KB, 下载7次)
15个Altera ip核，大家可以相爱在使用
15 Altera ip (2010-05-04, TEXT, 939KB, 下载331次)
st7920完整驱动C程序,已应用于产品开发中,稳定实用,无故障发生.
st7920 complete driver C program has been applied to product development, stable and practical, no failures occurred. (2010-01-27, TEXT, 2KB, 下载10次)
直流电机控制
伟福LAB6000微控制器实验系统
DC motor control (2009-07-06, TEXT, 4KB, 下载18次)
视频字符叠加器模块SPI接口c51公共函数(包含文件）
Video characters superimposed SPI interface module c51 public function (include file) (2009-05-12, TEXT, 2KB, 下载4次)
数字音乐盒code
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
Digital Music Box code
1. The use of I/O port must have a square-wave frequency, drive buzzer, different tone, so playing music (at least 3 pieces, each not less than the first 30 seconds)
2. Using LCD display information
3. Boot-up has prompted the English welcome characters, players display song number (or name)
4. Function keys can select music, pause, play.
5. Selected as the content: Display the remaining time or music playback time (2009-03-14, TEXT, 4KB, 下载4次)
DMX512协议最先是由USITT（美国剧院技术协会）发展成为从控制台用标准数字接口控制调光器的方式
DMX512 protocol is the first USITT (United States Association of Theater Technology) to develop into from the console using a standard digital interface to control the way dimmers (2007-10-20, TEXT, 3KB, 下载60次)
详细讲述变压器的功能,为大家更好的了解和应用变压器提供指南 (2007-08-21, TEXT, 708KB, 下载150次)
http://www.pudn.com/Download/item/id/321780.html
dds信号发生器
dds signal generator ask, am, fskdds signal generator ask, am, fskdds signal generator ask, am, fskdds signal generator ask, am, FSK (2006-06-11, TEXT, 3253KB, 下载127次)