Abstract: Disclosed is a device for protection of stored data comprising protection means to control a signal to enable the programming of a memory, the programming being permitted when the enabling signal is in a first state and prohibited when the enabling signal is in a second state, the protection means including a supply voltage drop detection device to set the enabling signal in the second state when the supply voltage is below a threshold, said device further comprising a time delay circuit capable of setting the enabling signal in the second state during a given period when a control signal goes into a first state.

Abstract: A device for protection of data stored in a memory includes a supply voltage drop detection device to set an enabling signal in an active state when a supply voltage is below a threshold and a flip-flop circuit whose output controls the state of the enabling signal concurrently with the supply voltage drop detection device so that all programming is prohibited when the flip-flop circuit stores a first state, and the protection device is organized in such a way that this state of the flip-flop circuit is modified only after the supply voltage drop detection circuit has detected that the supply voltage is below the threshold.