| 摘要 |
Data may be written to the EEPROM (50) by use of the standard microcontroller (42), and data may be read out to the microcontroller (42) through a standard analog-to-digital converter (46). The microcontroller (42) suitably comprises a processor (44) connected to a ROM (45) and a RAM (43), all on an integrated circuit. A data outline (52), a control bus (54), and an address bus (56) are all suitably connected from the processor (44) to the EEPROM (50) according to conventional techniques. A reference fingerprint corresponding to numerical representations of a measurement of the levels of charges trapped in the memory cells is generated and stored. An intentional offset error voltage may be applied when writing data to the memory cells in order to enhance the security of the data. The reference fingerprint may be encrypted for added security.
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