用VKDL语言编写的PWM控制程序很有用本例只做了5路PWM-VKDL languages with PWM control procedures useful in this case only a 5 PWM

C51写的串口编程的范例，写串口的兄弟可以参考！-C51 write serial programming paradigm, write serial port can refer to the brothers!

在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张， 于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却 发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高， 但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支! 那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?

用单片机系统实现8位的加减乘除运算，外接16位矩阵键盘输入，通过lcd显示结果。在keil上运行良好。-microcontroller systems with eight of the arithmetic operators, 16 external keyboard input matrix, LCD display results. Keil in running good.

凌阳单片机nrf2401模块程序源代码， 用于无线收发模块，经测试无误-Sunplus Singlechip nRF2401 source code modules for the wireless transceiver modules, have been tested and accurate

这是主机C8051F005有硬件SPI的AT45DB041B的读写驱动-This is a C8051F005 mainframe hardware SPI AT45DB041B literacy drive

51系列单片机CRC校验程序-51 series monolithic integrated circuit CRC check routine

单片机上智能拼音输入法,附有控制和杳询函数.方便使用调用.可以自加LCD实现可视化键盘输入!供大家参考!-microcontroller smart Pinyin input method, with the control and with the enhancement of function. To facilitate the use of call. Since the LCD can be added to achieve visual keyboard! For your reference!

51单片机驱动LCD的子程序，LCD为定制的液晶，采用HT1621作为LCD驱动芯片-Single-chip LCD driver 51 of the subroutine, LCD for customized liquid crystal, used as the LCD driver IC HT1621

使用AT89C52单片机，12MHZ晶振，包括发射和接收程序。-AT89C52 single-chip microcomputer use, 12MHZ crystal, including the transmitting and receiving procedures.