实现MODBUS RTU的完整代码，做MODBUS RTU网关的很实用。

读写AT45D041卡的c51程序-literacy AT45D041 decoder card procedures

dds调试源代码，已经调试好的，可以直接使用，谢谢！-dds debug source code, debugging has been good, and can be used directly, thank you!

计时器,用于初学单片机的人了解学习研究用-Timer for the beginner to learn to understand SCM research

modbus485通信协议C程序，经修改已用于项目，熟悉后修改部分参数即可用于485通信相关项目。-modbus485 communication protocol C program, as amended, have been used for the project are familiar with some parameters after the change can be used for 485 telecommunications related projects.

430成都技术培训会代码，使用IAR-4.10打开。-430 technical training in Chengdu will be the code, the use of IAR-4.10 open.

这个是单片机和电脑进行通信的单片机作为上位机向电脑发送数据-This is a single-chip and single-chip computer to communicate to the computer as a host computer to send data

这是一个键盘扫描的程序，相信想做毕业设计的同学非常想得到的哦，想要就看看吧，不好的话多提建议哦-This is a keyboard scanning procedures, wanted to believe that the students graduate design is the kind of oh, want to see it on, the poor more suggestions oh

RS485 MODBUS C51程序(EE21学习板演示程序) -RS485 MODBUS C51 program (EE21 learning demo board)

c8051f06x系列单片机的程序，包括头文件和ad转换等一些常见的，一共有三个-Series Singlechip c8051f06x procedures, including the header files and ad some common conversion, a total of three

超声波测距,包括有pcb原理图，用c写的程序，还有详细的说明-Ultrasonic ranging, including schematics pcb with c written procedures, detailed instructions have