Anders Ejdeling

Disable PST/DDATA signals on MCF5274

Discussion created by Anders Ejdeling on May 8, 2009
Latest reply on Jul 14, 2013 by TomE

I am trying to disable the PST and DDATA BDM signals on an MCF5274. This is to reduce emissions.


The manual states that setting the PSTEN bit in CCR to '0' will disable these signals. The problem is that it does not work for me. This bit is always '0' no matter what I write to it and the signals are still active.


Is there something special I have to do in order to read and write this bit? (The CPU is in supervisor mode).