Electronic locking system
US4785425A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1987 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Feb 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/102
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.