When it comes to anti-interference of MCU systems, which is more important, software or hardware?

While improving the anti-interference ability of hardware systems, software anti-interference is gaining more and more attention due to its flexible design, saving hardware resources and good reliability. The following takes the MCS-51 single-chip microcomputer system as an example to study the anti-interference method of microcomputer system software.

1. Research on software anti-interference methods

In engineering practice, the content of software anti-interference research is mainly: 1. Eliminating the noise of analog input signals (such as digital filtering technology); 2. Methods to get the program back on track when the program is running chaotically. This paper proposes several effective software anti-interference methods for the latter.

(1) Instruction redundancy

(2) Interception technology

2. Design of system fault handling and self-recovery program

Resetting the microcontroller system due to interference or after power failure is an abnormal reset. Fault diagnosis should be performed and the system should be able to automatically restore to the state before the abnormal reset.

(1) Identification of abnormal reset

(2) Programming for system self-recovery after abnormal reset

There are some other common methods for software anti-interference, such as digital filtering, RAM data protection and error correction. In engineering practice, several anti-interference methods are usually used together to complement each other to achieve better anti-interference effects. Fundamentally speaking, hardware anti-interference is active, while software anti-interference is passive. It is completely feasible to carefully analyze the interference source, combine hardware and software anti-interference, improve the system monitoring program, and design a stable and reliable single-chip microcomputer system.