There is high demand for portable, energy efficient products in both consumer and industrial markets. The battery life of a portable product must increase with each new generation, as must energy efficiency ratings for larger products. The microcontroller (MCU) plays a central role in achieving the necessary power reduction, as it both consumes power and controls other power-consuming components.

From the RS08 to its highest performance ColdFire V4 devices, Freescale’s Controller Continuum provides compatibility for an easy migration path up or down the performance spectrum. The Flexis series features a single development tool for easing migration between 8-bit (S08) and 32-bit (CFV1), a common peripheral set to preserve software investment between 8-bit and 32-bit, and pin compatibility wherever practical to maximize hardware reuse when moving between 8-bit and 32-bit. This application note explains how to use the power consumption-reducing features in the Flexis MC9S08QE128 and MCF51QE128 microcontrollers.