Preliminary the world's most energy friendly microcontrollers EFM32WG330 DATASHEET F256/F128/F64 Preliminary ARM Cortex-M4 CPU platform High Performance 32-bit processor @ up to 48 MHz DSP instruction support and floating-point unit Memory Protection Unit Flexible Energy Management System 20 nA @ 3 V Shutoff Mode 0.4µA @ 3 V Shufoff Mode with RTC 0.65 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detecto.