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Explanation of KL43Z features (ROM bootloader and USB crystal-less operation)

Question asked by Piotr Cerba on Aug 23, 2015
Latest reply on Aug 24, 2015 by Mark Butcher

Hello, while reading about KL43Z I stumbled across this article Unboxing the Freescale FRDM-KL43Z Board | MCU on Eclipse by Erich Styger.

I wanted to ask what are the benefits/drawbacks of this separate ROM bootloader and crystal-less USB operation in comparison with eg. KL46Z.

Why are LDD not supported? What limitations does it put?