I've designed a PCB that uses the MK20DX256VLH7. Upon first power-up, the microcontroller appears dead. No 16MHz XTAL oscillation, and the DX256's RESET pin is held asserted. Supply voltage is steady at +3.3V. AT this stage, I've not attached any other devices to the DX256, other than a USB connector.
What issues could be causing the part to be stalled like this? I'm very perplexed at this point.
Many thanks, in advance!