说明：  单片机原理与应用及C51程序设计-唐颖，是51单片机初学者的最佳教材，也是硬件设计者不错的参考手册
(And C51 single chip microcomputer principle and application program design- Connie, is the best teaching materials for beginners 51 single-chip microcomputer, and hardware designers of good reference manual )