A microsequencer circuit with plural microprogrom instruction co

Details A microsequencer circuit with plural microprogrom instruction co A microsequencer circuit with plural microprogrom instruction co

1986-12-04

1989-04-11

Eng, David Y.

Boots, shoes, and leggings

G06F 930

Patent

active

048211834

ABSTRACT:
A microsequencer includes at least two program counters which access microinstructions stored in a memory system. A first program counter is cyclicly incremented to sequentially access microinstructions of a principal microprogram. When a particular microinstruction is accessed which indicates that a subroutine will be the next program to be executed, a branched-from address, representing the microinstruction calling the subroutine, is retained in the first program counter. An address representing the first instruction of the subroutine is loaded into a second program counter. The second program counter is then cyclicly incremented to sequentially access microinstructions associated with the subroutine. After the subroutine has been executed, the first program counter is re-enabled and cyclicly incremented so that the execution of the principal program is resumed in an orderly manner.

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