The MPC551x family has introduced features into a Power Architecture family of devices that support reduced current consumption, specifically to assist the power-sensitive body electronics system space. The power consumption can be tuned during dynamic operating modes, where code execution and actuation are supported, and also in static modes, where the minimum power consumption is necessary.
Application Note for MPC551x family
Freescale has recently introduced the MPC560x family in a joint development program with STMicroelectronics. This family shares many low-power features with the MPC551x family, but users migrating from one family to the other need to be aware of key differences between them. This document outlines the differences between the MPC551x and the MPC560x familes.