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Minimum VDD for USB device

Question asked by Josip Haluska on Sep 18, 2017
Latest reply on Sep 21, 2017 by Bob Paddock

What is minimum voltage for MKL27Z64VLH4 (or similar M0+) to work as USB device? Is it possible to use it as 1.8V like on attached picture?

If I understood right, during working as crystalless USB device, internal precise 48 MHz clock can be used also as source for master (or for other peripherals) clock. 

I found FlexIO AN for UART, I2C, SPI, PWM. Is there any FlexIO SWD (master) open source example?