As MCUs get faster and their geometries get smaller, it becomes more important to consider EMI/EMS noise issues when designing MCU-based systems. This class covers three aspects of designing low-noise MCU systems, including basic EMI/EMS fundamentals using a common terminology. System-level architecture, component selection and circuit design considerations, as well as general layout concepts are also be discussed. Finally, the class describes MCU characteristics that help improve the overall system performance, while keeping the noise level down.