Patent ID: 8406069
Filing Date: 2013-03-26
Classification: G11C

Abstract:
1. A data writing method for an electronic erasable read only dynamic memory (EEPROM) in an electronic device using a writing device, the electronic device including an expansion connector connected electrically to the EEPROM, and a system unit connected electrically to the EEPROM and the expansion connector, and generating a system voltage and a write-protection voltage, the system voltage having an initial voltage value, the EEPROM receiving the system voltage and the write-protection voltage from the system unit such that the EEPROM is operable, based on the system voltage and the write-protection voltage, in a write-protection state when the write-protection voltage is not smaller than the system voltage, or in a write state when the write-protection voltage is smaller than the system voltage, the writing device having stored data to be written into the EEPROM and including a connector having the same interface as that of the expansion connector said data writing method comprising the steps of: a) when the connector of the writing device is connected to the expansion connector of the electronic device such that the writing device receives the system voltage from the system unit of the electronic device via the expansion connector, generating a write-enable voltage greater than the system voltage, and outputting the write-enable voltage to the system unit of the electronic device via the expansion connector; b) raising the system voltage in response to the write-enable voltage received by the system unit such that the write-protection voltage is smaller than the raised system voltage to thereby enable the EEPROM to operate in the write state; and c) writing the data from the writing device into the EEPROM via the expansion connector.