通过环路串口判断串行通信电平转换芯片功能是否正常，并通过读写DRAM 判断硬件。...

采用PDIUSBD12开发的USB总线与429总线数据转换的单片机固件程序-used PDIUSBD12 development of the USB bus with 429 data conversion MCU firmware

C51汇编必做试验3 -- 键盘扫描（C51最常见的应用哦）-ASM exam3-- Scan KeyBoard.

读写C8051F020内部FLASH的代码-Read and write code C8051F020 internal FLASH

普通有刷直流电机PWM闭环控制C51完整源程序-Brush DC Motor has ordinary PWM closed-loop control C51 complete source

16c552驱动程序，两个穿口+1个并口的驱动程序-16c552 driver, two I wear a parallel port drivers

一个基于单片机的充电器程序，能冲各种电池，可以设定模式。-A procedure based on single chip charger can be washed all kinds of batteries, you can set the mode.

ad 转换　５１编程事例　值得学习以下对出学者有用 -ad converter 51 programming examples worth learning from the scholars of the following useful

单片机控制串口鼠标芯片范例，实现方向判断和数值计算功能-SCM serial mouse chip sample, judge and realize the direction of numerical functions

这篇报告介绍了关于PIC单片机原理与应用。主要有以下几方面内容：1 利用PIC单片机的PC计数器及实时计数器计数或计时，利用LED数码管显示数据。 2．利用PIC单片机进行各种信号、数据的采集。 3．利用单片机的控制功能实现控制。 4．了解其硬件上各引脚输入输出口，充分掌握其各个指令和基础编程，以及一些简单的应用。 5．利用EEPROM实现单片机的数据掉电保存及利用I2C模式进行通讯。 -This report describes the PIC microcontroller on the Theory and Application. Mainly the following aspects : the use of a PIC microcontroller and the real-time counter PC Counting or time, use of digital LED display data. 2. PIC for the use of the signals, and data acquisition. 3. Microprocessor control functions to achieve control. 4. Understanding of the various hardware input and output pins I fully understand the basis for all orders and programming, and some simple applications. 5. MCU use EEPROM data preservation and the use of power-down mode I2C communications.

这是本人学习avr的一点成果吧{ 硬件mega8l，8个led共阳极接到PORTD。3位拨码开关接到PINB2,PINB1,PINB0,选择显示内容，PINC4接方向开关，使得正反向摇动都显示正向字，每次显示4个8X8点阵汉字（自己编制的），内附：原理图。实物图片，给有兴趣的朋友-This is my point to learn the outcome of avr bar (hardware mega8l, 8 Ge led a total of anode received PORTD. 3 DIP switches received PINB2, PINB1, PINB0, choose to display the content, PINC4 then switch the direction of making the pros and cons to the rock show that positive words, each show four 8X8 dot matrix characters (self-compiled), the enclosing : Principle diagram. Physical picture, to interested friends