The single chip microcomputer integrates the central processing unit (CPU), memory, input and output on a chip. It can be said that the single chip microcomputer is a microcomputer, but its function is different from that of the computer we usually use, and it is not as strong as the computer we use.

The computer can run one application after another, and the microcontroller can write executable files according to the engineer's instructions to realize various functions. So, how does the microcontroller know what instructions to execute and what actions to do? How are our instructions recognized by the microcontroller? Understanding this process can deepen the understanding of SCM.