Abstract: The application of single chip microcomputer (SCM) is one of the main technologies in smart terminal electronics of modern society, and relevant courses present compulsory ones of university students in engineering. In order to improve students’ understanding of the operating principle and the process of programming, reading and erasing the data in the memory units of a SCM, this paper adopts CD4520 (synchronous counter), 74HC154 (a 4-line to 16-line decoder), and a switch matrix circuit to design a model of experimental circuit based on Proteus. The simulation experiment demonstrates the operating principle and the process of programming, reading and erasing the the data in the memory units of a SCM.