The rotary encoder includes a rotary scale in which a spiral pattern is formed, and a sensor unit including a light source and a first light-receiving part that detects light entering via the spiral pattern. A power-on-reset circuit in the integrated circuit has an output coupled to a driver circuit that is powered by the high-voltage. A memory controller module generates memory power management signals based on at least one of the CPU throttle control signal, memory readwrite signals, memory access break events, and bus master access requests. The system generates images showing the relationship of the metric values to the normative data, optionally utilizing one or more thresholds extracted from the database or provided by the user.