14.2.2.4 GPNVM[4:2]: Erase Function Lock (EFL)

To avoid erase of the device, the ERASE signal can be locked by programming the GPNVM[4:2].

The EFL function is managed at application level. By default, the ERASE signal is active. The software can lock the ERASE signal by setting the Erase Function Lock (EFL). These bits can be set to 0 or 1 by software and they apply only to the ERASE signal. These bits do not prevent erase commands requested by the software.

When the EFL locks the ERASE signal and the security bit (GPNVM[0]) is enabled, the device cannot be recovered. This function should be used only at the end of the production process. EFL has three bits to allow the majority filter mechanism.