说明：  Proteus 是目前最好的模拟单片机外围器件的工具，真的很不错。可以仿真51 系列、AVR，PIC 等常用的MCU 及其外 围电路（如LCD，RAM，ROM，键盘，马达，LED，AD/DA，部分SPI 器件，部分IIC 器件，...）
(Proteus is the best simulation of the external device SCM tools, it is really good. Simulation can be 51 series, the AVR, the popular PIC MCU and the external circuit (such as the LCD, RAM, ROM, keyboard, motor, LED, AD/DA, part of SPI devices, part of IIC devices ,...))