说明：  80c51汇编指令集：包括111条汇编指令集，和详细的中文说明。RAM区的详细分区表，PSW,IE,TMOD等所有特殊功能寄存器的详细中文说明，及使用方法。是汇编的学习利器和查询工具
(80c51 assembly instruction set: including the 111 Series instruction set, and a detailed Description. RAM area detailed partition table, PSW, IE, TMOD Special Function Register and other details of all the Chinese instructions, and use. Is a compilation of the learning tool and query tools)