A small keyboard program, there are nine buttons, through the 422 control other...

基于51单片机实现UART通信 SPI通信 和IIC通信 -Based on 51 single-chip UART communication realize SPI and IIC communications communications

主要功能是实现16*16LED阵列的汉子显示，程序简单易懂，适合刚刚接触单片机和c语言的学者-Main function is to achieve 16* 16LED array guy show, the program simple and easy to understand, for just contact with scholars of microcontroller and c language

广告机源程序，可以实现任意字的显示，可以是汉字或字母-advertising source machine can achieve arbitrary character, or Chinese characters can be letters

是关于sd卡的接口电路图以及pcb封装原理图 是sd卡驱动者重要的资料-Is on the sd card interface circuit and the pcb schematic package sd card driver is important information

在c8051f020上实现的控制无线模块nrf401和程序，绝对原创-C8051f020 achieved in the control of wireless modules nrf401 and procedures absolute originality

8051单片机开发工具DIY-8051 DIY Tools

周立功C51工具书.rar-weeks meritorious C51 tool. Rar

12864 做成的数字钟 内含有仿真 是PROUUE 的仿真-12864 made digital clock PROUUE contain simulation is the simulation

1. 本程序实现了两个功能,即6264的随机读与写 2. 实现对同一端口既作输出又作输入,如程序中 PORTA作为数据输入输出口； 3. 测试接线方式见Proteus仿真文件。-1. This procedure has two functions, that is, 6264 randomized read and write 2. To achieve the same port for both output also for input, such as PORTA process as a data input and output port 3. Test Connection documents, see Proteus simulation.

程序能够实现将十二位的二进制数5V对应fffH变换成一路0~5V的电压。 精度方面：在使用时上下波动范围大约是0~2fH能保证高位寄存器准确； 调试过程中遇到了一系列问题：（1）p0口的使用需接上拉电阻，内部没有带电阻；（2）调试的过程最好使用单步运行，以便于察看寄存器的内容；（3）对系统板不熟悉，一些硬件方面容易出问题，像口连接，电源、地的连接。（4）直流电源使用不准确，内部的各个电源输出是独立的，需要共地。 -procedures to achieve 12 to a binary number 5V counterparts fffH transform all the way into the 0- 5V voltage. Accuracy : the use of fluctuating ranges of 0 ~ 2fH can guarantee accurate high register; debugging process encountered a series of questions : (1) p0 I need to connect to the widening use of resistance, with no internal resistance; (2) the process of commissioning the best use of single-step operation, in order to inspect the contents of Register; (3) The right not familiar with the system board, Some hardware problems are likely to occur, such as connectors, power, and connectivity. (4) DC power supply use of inaccurate, all within the Power output is independent, to the total needs.