it seems, that (according the informations from the USBDM page - USBDM: USBDM Debugger interface for Freescale RS08,HCS08,HCS12,Coldfire and ARM-Kinetis Devices.) the DSC support is for the "M56F80xx only", and in the table about the various USBDM hardwares there is a note: "DSC support is very limited in Codewarrior 10 and the stand-alone programmer".
We are using this DSC in our design and we made some USBDM_CF_JMxxCLD_V3, which are used in our development process, mostly with HCS08 chips. It could be nice to have support for this DSC in USBDM.
So there is a question for pgo: is there any possibility to add support for the MC56F82748 DSC?
I don't know the reasons why this DSC is not supported. Maybe there are technical reasons and maybe simply there was no need to add the support yet as most people uses USBDM with HCS08 and Kinetis processors.