印刷电路板。键盘控制，矩阵键盘电路。

出租车计费系统 里面有相应的键盘扫描程序，以及相应的 显示模块-Taxi billing system there are corresponding keyboard scanning procedures, and corresponding display module

整有效。中间四个字节分别代表设备的地址、指令类型、指令参数1(OPT1)和指令参数2(OPT2)。设备在对这四个字节的内容进行译码后执行相应的操作

这是一个在在Dynamic C环境下实现的设备web服务器的建立，通过它可以通过web方式管理设备。注意main函数中导入网页的目录要跟你实际的目录一样。-This is a Dynamic C in the environment under the equipment of the establishment of the web server, Through its way through the web management equipment. Attention to the main function of the directory into the website actually tell you the same directory.

51单片机常用子程序大全，包括多字节加减乘除，码字转换，浮点数格式化-51 microcontroller used subroutine Daquan, including multi-byte arithmetic, code conversion, floating point format, etc.

此为AD转换器ADC0809的资料-this AD converter for the ADC0809

51单片机的最小系统版，带串口，ds1302，1602,ds18b20,键盘，数码管，ISP在线下载-51 SCM minimum system version, with serial, ds1302, 1602, ds18b20, keyboards, digital tube, ISP online download

合泰USB键盘程序，希望对初学者有帮助。-Hetai USB keyboard procedures, and they hope to have help beginners.

51单片机驱动LCD的子程序，LCD为定制的液晶，采用HT1621作为LCD驱动芯片-Single-chip LCD driver 51 of the subroutine, LCD for customized liquid crystal, used as the LCD driver IC HT1621

计数综合程序！已经调试通过，拿来就可以使用！-Comprehensive counting procedures! Have been debug is passed, use can use!

用51汇编语言设计的DTMF发生器程序 输出到PI的每次间隔是52个指令周期 主频：6M，6M/12=0.5M,每个指令周期：2uS 即每次输出到P1的时间间隔是122uS 指令周期数：52 + 9 = 61-51 assembly language using the design process DTMF generator output to the PI for each interval is 52 instruction cycle speeds : 6M, 6M/12 = for 0.5 per instruction cycle : 2uS that each output to the P1 time interval is 122uS instruction cycle : 52 9 = 61