Thank you very much CB!
Now I have another problem I'll deal with tomorrow. Maybe it is connected to this post: http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/235894.aspx. Using SEGGER software I can program and read back aleatory data; but IAR EWARM won't program, although it reads correctly the data programmed by SEGGER S/W.
Regards,
André.