The WLR089U0 module contains ATSAMR34J18B SiP, 32.768 kHz crystal, 32 MHz TCXO, RF switch (SP3T), lumped element harmonic filter, RF matching components and a Low Pass Filter (LPF) (see the following figure).
Figure 1. WLR089U0 Module Block Diagram
Note: The ATSAMR34J18B SiP includes an ultra-low power SAM L21 ARM Cortex M0+ based
microcontroller along with a low power long range transceiver.