Vector interrupt system and method

Details Vector interrupt system and method Vector interrupt system and method

1983-11-14

1986-12-09

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 946

Patent

active

046284494

ABSTRACT:
The disclosure relates to a re-vectoring circuit of a microprocessor system wherein pending interrupts are serviced without unnecessary microprocessor state store and restore operations associated with a return-from-interrupt instruction. At the conclusion of an interrupt service routine, an indirect jump instruction is executed through the same address location of an interrupt vector that the microprocessor indirectly jumped through when the microprocessor was initially interrupted. However, the indirect address is modified, that is, re-vectored to an indirect address within a predetermined address vector depending upon the type of a pending interrupt. The re-vectoring circuit recognizes the indirect jump address and then senses a pending interrupt if there is a pending interrupt. The re-vectoring circuit modifies the indirect address such that a jump occurs to the highest priority pending interrupt service routine. This modification of the indirect address eliminates the store and restore of the microprocessor state in between the servicing of various interrupts.

REFERENCES:
patent: 4200912 (1980-04-01), Harrington et al.
patent: 4255786 (1981-03-01), Holtey et al.

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