Question re: crystals...

[Constantin]

Is it permissible to use a NX series crystal (used on the 3.x series) with a MKL26 CPU (i.e. LC series)?

The pF load capacitor ratings for the two crystals are almost the same (8 vs. 9 pF) but one pF = 10% of expected load capacitance!

 

[JBeale]

You can adjust the capacitive loading in software using OSC0_CR, right? I pulled the Teensy 3.1 crystal frequency more than 100 ppm by changing that register value, but I don't know what that corresponds to in capacitance. https://forum.pjrc.com/threads/28098-Crystal-pull-range-on-3-1?p=68210&viewfull=1#post68210