WRITE PROTECTION CIRCUIT FOR A NONVOLATILE MEMORY DEVICE AND METHOD THEREOF

摘要

The subject invention provides an apparatus for controllably programming an EEPROM, thereby reducing the likelihood of an inadvertent EEPROM write. The apparatus includes a first circuit which repeatedly produces a pseudo address signal at a preselected frequency. A second circuit receives the pseudo address signal and deliveries a write-enable signal to the EEPROM in response to receiving the pseudo address signal a preselected number of times. A third circuit delivers an address signal and a corresponding data signal to the EEPROM during at least a portion of the production of the write-enable signal. The address signal is indicative of an address location in said EEPROM and the data signal corresponds to the data to be stored in the EEPROM address location.