STMicroelectronics, 32bit ARM 32-bit Cortex-M0, ARM Cortex M0 Microcontroller, 826 → 958MHz, 256 kbyte Flash,

The STMicroelectronics STM32WL33xx is a high performance ultra-low power wireless application processor, intended for RF wireless applications in the sub-1 GHz band. It is designed to operate in both the license-free ISM and SRD frequency bands such as 433, 868, and 915 MHz. Direct data transfer between memory and peripherals and from memory-to-memory is supported by seven DMA channels with fully-flexible channel mapping by the DMAMUX peripheral. It operates in the -40 to +105 °C temperature range from a 1.7 V to 3.6 V power supply. A comprehensive set of power-saving modes enables the design of low-power applications.

Ultra-low power sub-1GHz wireless system-on-chip
Radio frequency bands 159 to 185 MHz and 413 to 479 MHz and 826 to 958 MHz
Air data rate from 0.1 to 600 kbit/s
Japan ARIB STD T67 and T108
Fully configurable hardware sequencer for autonomous radio operations
Low power autonomous wakeup receiver and featurings
Ultra low power architecture
Peripherals and analog front end
Communication interfaces
Ultra low power on reset and power down