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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).

nokia5110 lcd 的 keil C51 驱动程序，支持英文和汉字的显示-nokia5110 lcd the keil C51 driver, in English and Chinese support for the show

本文以51单片机为例介绍如何扩展USB接口进行对U盘的读写，并详细介绍FAT16、FAT32文件系统的细节以及如何编码实现单片机对文件系统的常用操作，顺带提到一点关于U盘兼容性问题的解决经验。在这里单片机是host，U盘是slave。-In this paper, single-chip microcomputer 51 as an example on how to expand the USB interface on the U disk read and write, and details on FAT16, FAT32 file system and how to encode the details of the realization of single-chip microcomputer used for file system operations, mentioned in passing that on U disk experience compatibility problems. Here is a single-chip host, U disk is a slave.

数字电子钟程序，计时时、分、秒，手动调整时间，闹铃，和整点报时-digital electronic clock procedures, a time when, minutes, and seconds, manual adjustments, Alarms, and the whole point is true.

MSP430F20xx的汇编程序示例，包括定时器范例、比较器范例-MSP430F20xx the assembler sample, including the timer example, comparator example

单片机C51串口中断接收和发送测试例程（含通信协议的实现）-C51 single-chip serial port receive and transmit interrupt routine test (including the realization of communication protocols)

基于单片机与FPGA的DDS程序代码，产生任意波形-DDS-based MCU with FPGA-code, resulting in arbitrary waveform

IIC 单片机io口模拟程序asm-IIC SCM io mouth simulation program asm

C51源代码，详细单片机C语言源码！包含大量C语言源程序。-C51 source code, detailed single-chip C language source code! Contains a large amount of C language source code.

7290i2c软件包.rar可以实现多种功能的I2c