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Reset held asserted at first power-up -- K20

Question asked by Gary Kitten on Jul 22, 2015
Latest reply on Jul 22, 2015 by Kerry Zhou

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!