 Both devices are ARM Cortex M0+, and have 256 KB Flash and up to 40 KB RAM and utilize OQPSK RF Modulation defined in IEEE 802.15.4 for a +3dB advantage in power efficiency vs. FSK modulation.Legacy devices supporting MiWi include several PIC Microcontrollers paired with the MRF89XA (Proprietary Sub-GHz Transceiver) or the MRF24J40 (an IEEE 802.15.4 2.4 GHz transceiver).MiWi Modules
In 2018 Microchip released the SAMR30M, a module based on the SAMR30 Cortex M0+ sub-GHz RF-MCU.