3.2.3.1 Main Clock Circuitry

The main clock oscillator is implemented with the crystal (Y2), ECS-240-10-37B2-JTN-TR.

The user can alternatively use the mounted MEMS oscillator (Y3) instead of the crystal. In that case, remove resistors R21 and R22, and populate resistors R23 and R25.
Figure 3-12. Processor Main Clock