MC68302
NXP
various advantages and challenges involved when migrating from the MC68302 to the MCF5272.
Application NoteNxp
Migrating from the MC68302 to the MCF5272
Technical guide for migrating from NXP MC68302 (68K) to MCF5272 (ColdFire) microprocessors, covering hardware, software, and module differences like Ethernet and SDRAM support.
Overview
This application note provides detailed guidance for engineers migrating designs from the Freescale/NXP 68K-based MC68EN302, MC68302, and MC68LC302 families to the ColdFire MCF5272 microprocessor. It outlines the performance advantages of the MCF5272, which offers up to 63 MIPS compared to the MC68302's ~2 MIPS. The document covers critical hardware considerations including voltage conversion (5V to 3.3V), capacitive loading limits, and signal mapping. It also provides module-level comparisons between SDRAM and ADRAM controllers, 10/100 Ethernet MAC implementations, DMA functional differences, and the transition from Serial Communication Controllers (SCC) to UART and Queued Serial Peripheral Interface (QSPI).
Use Cases
- Upgrading legacy 68K-based embedded systems to ColdFire architecture
- Implementing 10/100 Ethernet in 68K-derived processor designs
- Migrating 5V logic systems to 3.3V low-power microprocessors
- Replacing ADRAM with SDRAM in existing microprocessor applications
Topics
NXP MCF5272
MC68EN302
MC68302
MC68LC302
ColdFire architecture
68K migration
SDRAM controller
10/100 Ethernet MAC
QSPI
UART
microprocessor migration
embedded design
Referenced Parts
MCF5206e
NXP
For a detailed explanation of porting from M68000, please refer to Appendix B of the MCF5206e User’s Manual.
| MC68302 | NXP | various advantages and challenges involved when migrating from the MC68302 to the MCF5272. |
| MC68EN302 | NXP | migrating from the MC68EN302 and its derivatives to the MCF5272 microprocessor. |
| MC68LC302 | NXP | Table 1. MCF5272 and MC68XX302 Comparison ... MC68LC302 |
| MCF5272 | NXP | migrating from the MC68EN302 and its derivatives to the MCF5272 microprocessor. |
| MCF5206e | NXP | For a detailed explanation of porting from M68000, please refer to Appendix B of the MCF5206e User’s Manual. |