本书收集并整理了40个实用开发子程序，这些程序对学习开发C51系列单片机的初学者有相当重要的入门指导作用，对于有经验的开发人员来说，也极具参考价值。-This book collection and filing 40 practical development subroutines, these programs for learning development C51 series microcontroller beginners are quite important elementary guidance role for the experienced developers, also extremely reference value.