Welcome in the forum, Jan!
Are you really reading the Register TRM ??? ;-)
Not cover to cover, it's not exactly... riveting material.
I was trying to find out how to do a PSoC 4200 reset sequence while in debug mode. Imagine my dismay when I couldn't find the DHCSR or DEMCR registers, I thought my world would never be the same again!
Of course that was nothing compared to the state of numbed shock I experienced when, after half a day's worth of tinkering, I finally found out what it actually takes to reset and halt a PSoC 4200 in debug mode. (Possibly because it's so easy with PSoC 5LP chips)