Software

Software rarely has much effect on a system's radiated and conducted emissions (electromagnetic compatibility, EMC), but it can have a huge effect on the system's:

Tolerance for operator errors, misuse, and abuse.
Immunity to electromagnetic interference ( EMI).
Immunity to electrostatic discharge ( ESD).

Some things that software can do that may reduce emissions are:

Staggering the starting/ stopping of motors, instead of starting/stopping them simultaneously.
Switching a UART from input mode to output mode by going input-tristate-output, instead of input-output.
Using RAM inside the microprocessor/ microcontroller for frequently-used variables.
Not sending high-data-rate signals to peripherals that don't need them.

We want to protect the system from:

Software bugs.
Transient errors caused by electrostatic discharge (ESD).
Transient errors caused by noise on power lines.
Glitches

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