This interrupt is also issued in the use cases TRX_RESET and POWER_ON_RESET.
/* AT86RF212::SLEEP */ trx_pinset_slptr(0); delay(tTR2); /* AT86RF212::TRX_OFF && MCU::ISR */ cause = trx_reg_read(RG_IRQ_STATUS); /* MCU::ISR_AWAKEEND */