http://eleceng.dit.ie/frank/arm/BareMetalXMC2Go/index.html
https://github.com/furtnerthomas/Linux-XMC-Development
https://github.com/notandy/xmc4500-relax-linux
https://github.com/PromyLOPh/xmclib
https://github.com/Infineon/XMC-for-Arduino/tree/master/arm/variants/XMC4800
http://www.myxmc.de/tutorial/doku.php?id=systemtickc