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 ,...)

Keil 与proteus 完美结合教程.pdf
Proteus 入门教程.pdf

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