用于arm开发，keil开发环境

功能描述： 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行 频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对2－40KHZ 的信号频率进行准确计数，计数误差不超过2/1-Functional Description: Using AT89S51 MCU T0, T1 timing counter function, to complete the input signal frequency counting, counting the frequency of 8 resulted in the adoption of dynamic digital tube display. Request to the 2-40KHZ signal frequency accurately count, counting error of less than 2/1

FAT32文件系统在51单片机上实现，CPU类型是sst89c58-FAT32 file system in the 51 SCM to achieve, CPU type is SST89C58

基于msp4301611 的AD转换 及 FFT 算法-Msp4301611 based on the AD conversion and FFT algorithm

语音芯片PM50八方源代码，在播音函数中写入你需要播音的例子即可播放对应的语音。-voice chip PM50 from all source code, the audio function you need to write radio broadcast of examples corresponding voice.

msp430f149读HC165（4片串联）。兼有串口发送程序-msp430f149 Reading HC165 (four series). Serial sent both procedures

3*4键盘扫描程序 已加消抖功能 可以扩展为4*4~~~ 只用8个I/O口就能实现-3* 4 keypad scanner Buffeting extinction have been added functions can be extended to 4* 4 ~ ~ ~ only eight I/O port will be able to realize

一个很好用的密码锁程序，MCU用的是EM78P447，经试用非常可靠，提供给想学习EMC的用户使用，如有需要原理图的请发邮件到micheal23@sohu.com,注：需注明LOCK原理图-good with a password lock procedures, the MCU is EM78P447, tested very reliable, available to want to learn EMC users, if necessary schematic please send mail to micheal23@sohu.com, Note : LOCK be annotated diagram

在Proteus中实现按键延时复用，单个按键实现对整个屏幕的数据输入，并实现c语言中的冒泡算法，从大到小，从小到大排列-Proteus delay in achieving key re-use, single button to achieve the entire screen data entry, and to achieve c language bubble algorithm, from biggest to smallest, from small to large array

此代码是我们在单片机来控制CPLD记数,然后读出并转换数据,精度很高,在我们学校的电子设计大赛上还获的了二等奖-this code is in MCU to control CPLD counting, and then read out the conversion of data, the accuracy is high, In our schools Electronic Design Competition was also a second prize of

单片机C51的应用,高精度实时时钟－SD2001驱动程序的源码 -C51 microcontroller applications, high-precision real-time clock-SD2001 driver source code