详细的mp3设计sch pcb图纸几源代码

串口扩展芯片，可以扩展单片机的串口，使单片机的串口由一个变为3个甚至更多，降低成本。

通过AD0809将输入的模拟量转化为数字量， 通过调节电位器来改变模拟电压输入，通过数码管显示电压的变化-Through the AD0809 analog input into digital, By adjusting the potentiometer to change the analog voltage input, digital display voltage changes

4*4扫描键盘,通过键值通过4个数码管显示出来.-4* 4 Scanning keyboard, through key through four digital tube display.

P89V51RD2系列芯片是具有串口下载功能（ISP）和在KEIL中进行调试的功能（SOFTICE）。 新的芯片是ISP功能，通过FlashMagic 软件可以设置其为SOFTICE功能。 但要想回到ISP功能，则没有现成的好办法，只有通过编程器了。 但现在可以通过这个程序来恢复其ISP功能（禁止SOFTICE）。-P89V51RD2 series with the serial port chip is the ability to download (ISP) and the KEIL for debugging feature (SOFTICE). The new chip is the ISP, through FlashMagic software can be set to SOFTICE its function. However, to return to the ISP, there is no ready-made good, and that only through a programmer. But now through this procedure to restore its ISP (Prohibition SOFTICE).

c8051f040 t3频率方波输出，T4脉冲计数，T2计时例程-c8051f040 frequency square-wave output, pulse counting T4 and T2 time routines

msp430F149 框架模块程序，很好用-framework msp430F149 module procedures, very good use

51单片机实现红外键盘的解码，红外发射芯片61-51 single-chip implementation of the decoding infrared keyboard, infrared transmitter 6122

单片机实例，多个实例运用，迅速掌握单片机技术-Singlechip example, multiple instances of the use of single-chip technology quickly grasp

threadx操作系统源代码之-threadx operating system"s source code 111111111111111111111 111 111 111 1

单片机串口通讯源程序，具体功能经过测试，请大家-microcontroller serial communication program, the specific function of the test, please s