Interrupt apparatus for enabling interrupt service in response t

Details Interrupt apparatus for enabling interrupt service in response t Interrupt apparatus for enabling interrupt service in response t

1976-12-10

1978-07-04

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 104, G06F 1100

Patent

active

040992551

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.

REFERENCES:
patent: 3312951 (1967-04-01), Hertz
patent: 3426331 (1969-02-01), Joyce
patent: 3566368 (1971-02-01), De Blauw
patent: 3723975 (1973-03-01), Kurtz, Sr. et al.
patent: 3909795 (1975-09-01), Chang et al.
patent: 3999169 (1976-12-01), Perschy

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