Preliminary the world's most energy friendly microcontrollers EFM32LG330 DATASHEET F256/F128/F64 Preliminary ARM Cortex-M3 CPU platform High Performance 32-bit processor @ up to 48 MHz Memory Protection Unit Flexible Energy Management System 20 nA @ 3 V Shutoff Mode 0.4µA @ 3 V Shutoff Mode with RTC 0.9 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU retention 1.1 µA @ 3 V Deep Sleep .