The MCF5271 family is a highly integrated implementation of the ColdFire family of reduced instruction set computing (RISC) microprocessors. This document describes pertinent features and functions of the MCF5271 family. The MCF5271 family includes the MCF5271 and MCF5270 microprocessors. The differences between these parts are summarized below in Table 1. This document is written from the perspective of the MCF5271 and unless otherwise noted, the information applies also to the MCF5270. The MCF5271 family combines low cost with high integration on the popular version 2 ColdFire core with over 144 (Dhrystone 2.1) MIPS at 150 MHz. Positioned for applications requiring a cost-sensitive 32-bit solution, the MCF5271 family features a 10/100 Ethernet MAC and optional hardware encryption to ensure the application can be connected and protected. In addition, the MCF5271 family features an enhanced multiply accumulate unit (eMAC), large on-chip memory (64 Kbytes SRAM, 8 Kbytes configurable cache), and a 32-bit SDR SDRAM memory controller.