Interrupt apparatus for enabling interrupt service in response to time out conditions
US4099255A · kind A · utility
29Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Dec 10, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/4825
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Interrupt service is enabled for either a real-time clock or watchdog timer time out condition. A mode register is provided to effectively enable or disable the interrupt apparatus and if enabled is coupled to enable a service register in response to repetitively occurring clock pulses. Each time the service register is enabled, a counter is changed in value until a predetermined value is indicated at which time interrupt service is enabled at an interrupt level specified by the operator. Further, facilities are provided for presetting the value of the counter in an expeditious manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.