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Meaning of "FM+ capable"

Question asked by Petkovic.Martin on Jun 19, 2013
Latest reply on Jun 19, 2013 by Clive One
Hello to everyone!

What does it mean the "FM+ capable" feature of a pin? There is 5V tolerant, and 5 V tolerant I/O, FM+, pin (STM32F051x4 datasheet - pin PB6, PB7, PB8, PB9) and what is the diference? This feature isn't mentioned anywhere.

Thank You.