from enum import Enum

class ExternalNVMState(Enum):
    """
    Enum specifying the NVM chip state
    """
    OPERATING = 'OPERATING'
    STANDBY = 'STANDBY'

    def __str__(self):
        return self.value

class NVMPowerState(Enum):
    """
    Enum indicating the MCU state
    """
    ON = 'ON'
    OFF = 'OFF'

    def __str__(self):
        return self.value

class MCUPeripheralPowerStateBehaviour(Enum):
    """
    Enum specifying the behaviour of the peripheral's power state
    """
    ALWAYS_ON = 'ALWAYS_ON'
    FOLLOW_MCU = 'FOLLOW_MCU'