Using the Mini-FlexBus external bus interface for ColdFire microcontrollers

Freescale's ColdFire microcontrollers are available in a wide range of small form factors. In most cases, on-chip memory provides ample room for the application, with the option to expand functionality with simple, serially-interfaced memories and/or peripherals. In some cases, however, serially-interfaced devices cannot provide the performance or memory capacity needed.

The Mini-FlexBus is a simple EBI for MCUs that typically use internal memory, but need expandability. The bus interface minimizes package pinouts, while maintaining a high level of configurability and functionality.

The MCF5225x family of ColdFire microcontrollers is the first to include the Mini-FlexBus, and is the focus of this application note. This application note describes how to set up and use the Mini-FlexBus on the MCF5225x and shows some implementation examples. The M52259EVB evaluation board takes advantage of one of these examples and can be used as a reference. Although the focus of the application note is the MCF5225x family, the information contained herein will also apply to future devices with the Mini-FlexBus.

View the PDF document for more information.