这是一个基于8255扩展端口的keil c51的固件、驱动技术。

一种基于C8051F单片机的直流无刷电机转速控制系统-C8051F MCU based on brushless DC motor speed control system

锂电池 充电保护板 原理图及PCB图 protel99se 格式 珍藏板 已在工程实际用应用-Rechargeable lithium battery protection board and the PCB schematic diagram protel99se collection plate format has been used in engineering applications

红外遥控 液晶显示时钟数据 闹钟数据掉电保持 多级菜单 按键消息队列 -Infrared Remote Control LCD alarm clock and data to maintain multi-level data on power-down menu buttons Message Queue

通过61单片机显示飞翔的小鸟，并有背景音乐。-Singlechip through 61 show the flying birds, and have background music.

DM9000 10M/100M以太网扩展板Linux驱动代码-DM9000 10M/100M Ethernet expansion board-driven Linux code

电机的控制端分别接P1.7,P2.0,P2.1,P2.2,调速端接P2.3,P2.4,通过msp430f149的P2.3,P2.4输出PWM波，实现对电机的控制.

应用背景这里的文件包含的代码和proteus仿真接口的单片机AT89S52和74HC595  ； ；8位移位寄存器的…关键技术这是基于嵌入式技术，对初学者很有帮助；

模拟I2C总线源程序，以80C51为微处理器通过他的普通I/O口实现与外界具有I2C接口的器件通信。-I2C-bus analog source to the microprocessor 80C51 through his general I/O I realize with the outside world with I2C communications interface devices.

好文章！大家好好看吧！多处理器支持操作系统方面的-excellent article! Everyone sees good! Multi-processor support for the operating system

嵌入式ARM的生物识别系统，大家参考下，希望有帮助-ARM embedded biometric system, we refer to the hope that help