用C8051F310的定时器来实现定时中断，进而实现在扬声器实现不同声音的输出-C8051F310 timer used to achieve regularly interrupted, and then realize the sound at different speaker output

单片机proteus仿真，可以做成实例的仿真文件的-protues

avr串口实验,并且带有硬件原理图，程序简单，适合新手！-avr serial experiments, as well as with the hardware schematic diagram, a simple, suitable for novice!

使用89S52为核心做的USB键盘,注意修改了一下windows设备描述符以及端点处理等就行了。用了一个4*4的小键盘,有0-9十个数字键, Num Lock键,Caps Lock键,Shift键,Ctrl键,Alt键,回车键等。 最多可以有三个键同时按下，如果相交的话，最多只能两个键按下-89S52 use as the core of the USB keyboard to do, pay attention to modify the look and the windows device descriptor, such as treatment endpoint on the list. Used a 4* 4 small keyboard, has the number keys 0-9 10, Num Lock keys, Caps Lock key, Shift key, Ctrl key, Alt key, enter key and so on. Can have up to three keys pressed at the same time, if the intersection, then a maximum of only two keys pressed

这是一个用于实现电脑和pic单片机通讯的，通过usb接口的通讯程序！第一部分

at89s52对9313的测试程序，经过验证，能正常使用-at89s52 test procedures for 9313, after verification, to normal use

电子设计大赛开关稳压电源总程序，能实现基本和发挥部分的功能-Electronic Switching Power Supply Design Competition total procedures, can play a part and realize the basic functions of

单片机和电脑串口通讯，这个是电脑向单片机发送数据。-Single-chip and computer serial communications, this is a single-chip computer to send data.

C8051F020的全面应用,包括两个UART口、SPI、I2C，所有I/O均用上。-C8051F020 comprehensive application, including two UART port, SPI, I2C, all I/O is used.

用于工业设备上,对设备工作时间进行定时,到时后,将设备锁定,要进行重设时间-TIMER