structure
CPU + 片内振荡器 + 片内RAM + 片内ROM + 程序存储器 + 片外RAm + 各种接口引脚Pin
除了并行I/O引脚，还有部分控制引脚，用于各种结构的控制Storage structure
程序存储器 + 数据存储器（片内 + 片外） + 特殊功能寄存器（SFR）---就是控制寄存器和I/O口，累加器，定时器Clock circuit
是最基本的控制系统- Internal clock: Crystal Control
External clock: a plurality of microcontroller to work together
Reset circuit
Is twice the high level to the control input RST
Low power saving mode
It can be controlled by PCON- Idle Mode: PCON = ox01
Power-down mode; PCON = ox02, which is to shut down