Electronic locking system

Details Electronic locking system Electronic locking system

1987-02-27

1988-11-15

Fears, Terrell W.

Static information storage and retrieval

Hardware for storage elements

365 94, 365189, 364200, 3408255, H04Q 0000, G06F 100, G11C 700, G11C 1700

Patent

active

047854251

ABSTRACT:
A field programmable electronic locking system includes a processor and an electrically erasable programmable read-only memory (EEPROM). The processor has address outputs electrically connected to address inputs of the EEPROM to address memory locations within the EEPROM, data inputs electrically connected to data inputs/outputs of the EEPROM to receive data from the EEPROM, and a high-impedence control input for transforming the address outputs of the processor to a high-impedence state. An EEPROM programmer activates the high-impedence control input of the processor to render the address outputs of the processor to a high-impedence state during a programming operation, and transmits address information and data to the address inputs and data inputs/outputs of the EEPROM, respectively during the programming information to write data into said EEPROM. Consequently, the EEPROM need not be removed from its socket or printed circuit board during programming, and may be programmed in the field.

REFERENCES:
patent: 4680731 (1987-07-01), Izumi et al.
patent: 4698750 (1987-10-01), Wilkie et al.
patent: 4730187 (1988-05-01), Menich et al.

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