EMI is present in any digital system, and commonly attributed to fast rising edges of high frequency clocks in the system. Employing spread spectrum on a clock is an efficient way to eliminate the EMI being generated by the clock to reduce the total EMI the system is generating. Strict guidelines enforced by the FCC and EU regulate the amount of EMI a system can generate. Having the spread spectrum functionality of a clock generator is a good design practice, and can be thought of as a backup solution that can be turned on in the event of a system not passing FCC EMI testing. It is also a much cheaper and more convenient design alternative compared to metal shielding of ferrite beads.