What is MCU disassembly?

When engineers write microcontroller programs, they usually use assembly language or high-level language (C or C++). These program codes are called original codes. After the program is written, it is compiled by the compiler software or compiler to generate files that can be burned into the ROM storage area of ​​the microcontroller. The file suffixes generated by the compilers of different models of microcontrollers are different, but the commonly used BIN and HEX files are called machine codes in the decryption industry. Such machine codes are run in the microcontroller, and it can be said that only the machine can understand them. Disassembly refers to the decompilation of these executable files, that is, machine codes, back to assembly language. However, there are usually many differences between the decompiled program and the original program. Although the execution effect is the same, the program code will change greatly. If it is an assembly with more statements, it is difficult for ordinary people to understand. You need to add comments and then read them one by one. It requires a certain amount of perseverance. I once spent a week analyzing the disassembly code of a chip. So it is not that after disassembly, everything is clear with the original program. More technical analysis by engineers is needed. There are two methods of disassembly: manual disassembly and software disassembly. Nowadays, the scale of microcontrollers is getting larger and larger, and the embedded codes are getting more and more. This brings a lot of trouble to manual disassembly and requires a lot of time. Using software disassembly is an ideal way. As long as there is disassembly software, the disassembly work can be completed quickly after running it on the computer.