本书首先详细介绍了8051单片机的硬件，包括内存、寄存器等，然后引入其开发环境KEIL，由浅入深地介绍了如何使用KEIL平台开发8051单片机(This book first introduces the hardware of 8051 single chip microcomputer, including memory, register, etc., and then introduces its development environment KEIL. It introduces how to use KEIL platform to develop 8051 single chip microcomputer.)