Thomas Gaffney

Using the External Bus Interface on S12X?

Discussion created by Thomas Gaffney on May 29, 2007
Latest reply on Jun 5, 2007 by Alban Rampon
I am working on a project that is using an MC9S12XDT256 and we want to use the External Bus Interface (EBI) to control an off-chip communications controller.
Are there any things that must be done in software to operate the S12X in normal expanded mode?  In the datasheet, I can only find that the hardware must be set up properly on pins MODC, MODB, MODA, and ROMCTL (Section 1.4).
If there is an app. note that is more applicable to how to do the software setup to use the EBI, can you please point me to it.  I have only been able to find one mainly dealing with the timing of all the signal.  I am just wondering if I need to make linker file or hw register changes to use the EBI on the S12X.
Thank you,