Freedom Board for Kinetis K22F Hardware (FRDM-K22F) User’s Guide, FRDMK22FUG, Rev. 0, 07/2014

Freescale Semiconductor, Inc.

9

Universal Serial Bus (USB)

Figure 6. 8 MHz crystal clock source for MCU

Note that, unlike the MK22FN512VLH12 and MK22FN256VLH12 MCUs, the MK22FN128VLH10

MCU does not feature a Phase-Locked Loop (PLL).

By default, the 32.768 KHz crystal is connected to the K22F MCU’s RTC oscillator inputs.

Figure 7. 32.768 kHz crystal for RTC

6

Universal Serial Bus (USB)

The MK22FN512VLH12 MCU features a full-speed/low-speed USB module with on-the-go/host/device

capability and built-in transceiver. The FRDM-K22F board routes the USB D+ and D signals from the

MK22FN512VLH12 MCU directly to the onboard micro USB connector (J16).