Hi, Sandro,
First of all, pls confirm the part number you are using, do you use MC56F8023? If it is the case, I am sure that this is one of DSC family.
If you use MC56F8023, you can use both tools: "the CodeWarrior for DSP56800E tools" and "the CodeWarrior for mcu tools" to download/debug. Of course, both of the tools support USBTAP device.
Regarding the "PE Universal FX" device, I suppose that the CodeWarrior for DSP56800E tools does not support the "PE Universal FX" device, it only supports USBTAP device.The "the CodeWarrior for mcu tools" support both USBTAP device and the "PE Universal FX" device.
This is USBTAP device link:
USB TAP for ONCE DSC|NXP
Hope it can help you
BR
Xiangjun Rong