Protection circuit for a microprocessor
US5557743A · kind A · utility
43Cited by
13References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1994 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Apr 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C8/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Electronic devices using microprocessors requiring additional external memory can have security protection for the microprocessors while in an expanded mode of operation. A microprocessor having a security access circuit allows executable code to be stored in a peripheral storage device, such as external EPROM, while maintaining protection to the microprocessor EEPROM by monitoring if an instruction code is generated from an internal memory source or an external memory source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.