Single power supply reprogrammable nonvolatile memories have all the benefits of a single power supply device, but there is a concern that must be addressed by the user. Since single power supply reprogrammable nonvolatile memories, e.g., SST SuperFlash EEPROMs, are intended to be altered in-system with the use of one power supply, e.g., similar to SRAMs, there exists the possibility of unintentional writes. The means to avoid unintentional writes are described below.