Hi Giulio Gaio,
Thank you very much for your focus on Freescale Kinetis product. I'm glad to provide service for you.
FSL has already provided the Kinetis SDK kit v1.0 for the FRDM-KL03Z and it will help you develop the KL03 more easily.
Also you can port the code from the KL05_SC.exe to KL03, it's not hard to do it, however I'd like to suggest that the Kinetis SDK kit is the priority and you can download it through the link as below.
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=FRDM-KL03Z&fpsp=1&tab=Design_Tools_Ta...
Have a great day,
Jeremy
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