Data processing system with improved microsubroutine facility

Details Data processing system with improved microsubroutine facility Data processing system with improved microsubroutine facility

1982-03-16

1985-01-01

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

044919123

ABSTRACT:
A data processing system having a first storage for storing therein microprograms; an address register for supplying an instruction address of a microprogram to be executed into said first storage; a stack unit having a stack area for storing therein a return address of the microprogram; a first control unit responsive to a microinstruction for instructing a microsubroutine call to store the return address of the microinstruction in the stack unit, and responsive to a microinstruction for instructing return from the microsubroutine to restore the return address of the microinstruction from said stack unit; a second control unit for monitoring an interrupt request; a second storage for saving therein the content of said stack unit; a status register having a field for indicating the acceptance of the interrupt request in the course of the execution of the microprogram, and a third control unit responsive to the detection of the interrupt request by the second control unit in the course of the execution of the microprogram to indicate the acceptance of the interrupt request by the status register and save the content of the stack unit in said second storage, and responsive to the presence of the indication in the status register indicating the acceptance of the interrupt request at the end of the execution of an interrupt processing program to restore the content of the second storage to said stack unit.

REFERENCES:
patent: 4131941 (1978-12-01), Siegel et al.
patent: 4202035 (1980-05-01), Lane
patent: 4320453 (1982-03-01), Roberts et al.
patent: 4323964 (1982-04-01), Gruner
patent: 4398244 (1983-08-01), Chu et al.
patent: 4407016 (1983-09-01), Bayliss et al.

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