Hi Yasuhiko Koumoto,
Kinetis K2 is the next generation of Kinetis solutions.
- Extend Kinetis Enablement with further easy-of-use
- Introduce next level of performance, feature, and cost-effective K-Series devices
Kinetis K2 becomes the new Low-Power Reference for ARM Cortex-M3/4 “beyond 100DMIPS with FPU” for both dynamic and static modes
For the detail chip, please find it from the following picture:

More details, please go to this link:http://cache.freescale.com/files/training/doc/dwf/EUF-IND-T0976.pdf
http://cache.freescale.com/files/training/doc/dwf/EUF-IND-T0976.pdf
Wish it helps you!
If you still have question, please contact me!
Have a great day,
Jingjing
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