读取mifareOne卡的数据，并显示在LCD模块上，采用C语言开发，开发编译调试环境KeilC。基于RC522模块。...

基于51系列单片机内部定时器写的一个时钟程序-51 Series single-chip based on an internal timer to write a clock procedures

ST7920驱动128*64液晶串并口程序 可下载直接使用 另有相关资料解释-ST7920 driver 128* 64 LCD serial and parallel program can be downloaded directly related to the use of additional data interpretation

单片机C语言实现的对ROM进行测试的C语言的源代码。可供单片机开发人员参考。-SCM C language of the ROM to test the C-language source code. SCM developed for reference.

ping utility used for pinging proxy

北京大学的单片机教程，ppT文件，要学的可以自学，-Peking University microcontroller tutorials, ppT documents, to learn to self-learning,

液晶显示器以其微功耗、体积小、显示内容丰富、超薄轻巧的诸多优点，在袖珍式仪表和低功耗应用系统中得到越来越广泛的应用。 -LCD display with its micro-power consumption, small size, display rich content, ultra-thin lightweight many advantages, in the pocket instrumentation and low-power applications are more and more widely.

数码管组字，数码管经过排列组合，通过单片机控制组成的屏幕显示。-digital traffic control characters, digital tube through permutations and combinations, SCM control of the screen display.

采用PDIUSBD12开发的USB总线与429总线数据转换的单片机固件程序-used PDIUSBD12 development of the USB bus with 429 data conversion MCU firmware

由8051组成的单片机系统通常情况下，P0口分时复用作为地址、数据总线，P2口提供A15-A8即高8位地址，P3口用作第二功能，只有P1口通常用作I/0口。P1口是8位准双向口，它的每一位都可独立地定义为输入或输出，因此既可作为8位的并行I/O口，也可作为8位的输入输出端。当工作在输入方式时，对应位的锁存器必须先置1,才能正确地读到引脚上的信号,否则,执行读引脚指令时,若对应位的锁存器的值为0，读的结果永远为0。-By 8051, composed of single-chip microcomputer system under normal circumstances, P0 timeshare I reuse as address, data bus, P2 I provide A15-A8 high eight address, P3 mouth for the second function, I usually only P1 for I/0 I. P1 I was eight quasi-two-way port, it can be independent of each and every defined as input or output, it can be used as 8-bit parallel I/O port, can also be used as 8-bit input and output side. When the work in the input, the corresponding bit latch must first buy one in order to correctly read the signal pin, or pin the implementation of reading instruction, if the corresponding bit latch the value of 0, Reading the results of Forever to 0.