See microcontroller C language tutorial such as Guo Tianxiang's \"New concept 51 microcontroller C language tutorial\"; If you don't know C language, first learn C language well, learn Tan Haoqiang \"C programming\
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SCM is a combination of hardware and software, so you need to learn software and hardware two parts: software - you can learn assembly, you can also learn C language, it is recommended to learn C language, because now many people use C to program, and C language reading and portability is better than assembly. C language is closer to human language, it is easier to learn, of course, it is best to learn the assembly later, so that it is more handy in practical application. If you learn C language, you can buy Tan Haoqiang's \"C language Programming\"; Hardware - the basis of digital electricity, mode electricity must have, otherwise you will not get the circuit analysis and calculation will not use, as long as you find some digital mode electricity teaching materials to see, there is no special requirements.