Self-monitoring system for detecting error at output port during cold start of microprocessor system
US4709341A · kind A · utility
18Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1984 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Nov 9, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/0751
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A self-monitor system for a microprocessor performs self-checking during cold-start of the microprocessor. Self-checking is performed by applying a dummy load to a specific output port, and detecting the signal level at a checking port connected to the specific output port so that the output level at the check port coincides with the dummy load applied to the specific output port within a predetermined allowable time lag. An alarm is produced and a fail-safe operation is carried out if the signal level at the check port coincident with the dummy load is not detected within a given period of time after the allowable time lag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.