一个不错的ARM入门建议,51是一个基础，而且还很重要，这是再我看了ARM之后感觉到的。它可以加速你的ARM学习速度，真得！不相信你试一试好了-A good entry-ARM suggested that 51 is a basis, and very important, it is no longer felt after I read the ARM. It can speed up your learning speed ARM, really! Do not believe that

从51初学者到电子工程师，新手入门的经典教程-From 51 beginner to electronics engineers, novice to get into the classic tutorial

基于51系列数字时钟 大家要多上传好的共享-VERY good

51单片机通过CH376芯片以SPI模式读取SD卡。-51 through CH376 chip to read the SD card in SPI mode.

射频卡程序，c语言rc5200，51程序源码-RF card procedures, c language rc5200 51 program source code