Nonvolatile microprocessor with predetermined state on power-down
US5237699A · kind A · utility
106Cited by
16References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1992 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A battery-backed microprocessor which enters a known state on power-down. This is achieved, even if the microprocessor does not permit a single-cycle reset, by providing clock intercept circuitry on chip. When system power failure is detected, the clock intercept circuitry disconnects the external clock, activates a reset command, and then generates several clock cycles using an internal clock generator after the reset command. As many clock cycles are generated as is needed, with the particular architecture being used, to reach a predetermined state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.