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This paper presents an approach to simulate the immunity of the microcontroller based on dynamic, nonlinear and passive model. By introducing the dynamic elements, this modelling technique reflects both those dynamic and nonlinear behaviour of ports and cores of the microcontroller. It can simulate not only external interference from outside but also the internal interference of the microcontroller itself. The dynamic model is suitable for time domain simulation. It is capable of simulating both RF and pulse immunity of the microcontroller.