Method and apparatus for performing supervisory functions in digital systems and obtaining diagnostics thereof
US5528756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1995 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Jan 30, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/0757
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Digital supervisory and diagnostic circuitry to provide a watchdog function and a low voltage detect function and diagnostics for those functions. The watchdog function has a high immunity to EMI and RFI disturbances and may be enabled or disabled as necessary. An indication is provided of the cause of the last reset so that a reset due to EMI can be distinguished from a reset due to a power failure. The low voltage detect circuitry is implementable in an integrated circuit chip. The low voltage detect circuitry eliminates oscillations from the reset signal and provides a delay which is programmable by the user. The circuitry is designed so that the length of the delay can never be zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.