The MCF51AG128 is a member of the ColdFire family of 32-bit variable-length reduced instruction set (RISC) microcontroller. This document provides an overview of the MCF51AG128 series MCUs, focusing on its highly integrated and diverse feature set. The MCF51AG128 derivative are low-cost, low-power, and high-performance 32-bit ColdFire V1 microcontroller units (MCUs) designed for industrial and appliance applications. It is an ideal upgrade for designs based on the MC9S08AC128 series of 8-bit microcontrollers. The MCF51AG128 features the following functional units: 32-bit Version 1 ColdFire central processor unit (CPU) Up to 50.33 MHz ColdFire CPU from 2.7 V to 5.5 V Provide 0.94 Dhrystone 2.1 DMIPS per MHz performance when running from internal RAM (0.76 DMIPS per MHz when running from flash) Implements Coldfire Instruction Set Revision C (ISA_C)