51单片机是对所有兼容Intel 8031指令系统的单片机的统称。该系列单片机的始祖是Intel的8004单片机，后来随着Flash rom技术的发展，8004单片机取得了长足的进展，成为应用最广泛的8位单片机之一(The 51 microcontroller is the general name for all the SCM compatible with the Intel 8031 instruction system. The first ancestor of this series of singlechip is the 8004 singlechip of Intel. Later, with the development of Flash ROM technology, the 8004 MCU has made great progress, and it has become one of the most widely used singlechip.)