Migrating Between MC9S08AC and MCF51AC Flexis Devices

Overview

This application note provides detailed instructions for transitioning from the 8-bit MC9S08AC MCU to the 32-bit MCF51AC ColdFire V1 MCU. It focuses on the Flexis series' features, including pin-to-pin compatibility, shared development tools, and common peripheral sets. The document outlines architectural differences between 8-bit and 32-bit cores and provides specific porting tips for C applications, such as removing inline assembly, managing interrupt vector changes, and referencing memory via header file declarations. Technical comparisons of clock modules (ICG to MCG) and timer modules (TPM and FTM) are included to assist in maintaining timing consistency and code reuse during migration.

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