With the development of microelectronics, the design of electronic system enters theage of System On Chip (SOC), and the functions of MCU get more and more powerful,therefore, it comes to be the system single-chip truly.

• 随着微电子技术的迅速发展,电子系统设计已进入了片上系统(SOC,System On Chip)时代,微控制器的功能也越来越强,使其真正成为系统微控制器。