Proteus6.7 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

-Proteus6.7 is the best tool for simulation of microcontroller peripherals, really good. Can be simulated 51, AVR, PIC and other commonly used MCU and its peripheral circuits (such as the LCD, RAM, ROM, keyboard, motors, LED, AD/DA, part of the SPI devices, part of the IIC device