Single step system for a microcomputer

Details Single step system for a microcomputer Single step system for a microcomputer

1979-09-28

1981-12-29

Zache, Raulfe B.

Boots, shoes, and leggings

371 19, 371 29, G06F 1100

Patent

active

043085814

ABSTRACT:
A microcomputer system having a single step capability for use for debugging a program is provided. The microcomputer has a microprocessor which provides a load instruction signal. The load instruction signal is used to couple a software interrupt op code into the microprocessor. During the software interrupt routine, contents of registers indicating the state of the microprocessor are transferred to a stack. As the contents are being transferred they will be available on the microprocessor output bus for capture and observation. Upon completion of the software interrupt routine a return from single step instruction causes the contents of the stack to be placed back in their original registers and the program counter of the microprocessor is decremented by one so that the microprocessor can pick up the program from the point where it was interrupted.

REFERENCES:
patent: 3415981 (1968-12-01), Smith et al.
patent: 3937938 (1976-02-01), Matthews
patent: 3987420 (1976-10-01), Badagnani
patent: 4091447 (1978-05-01), Dillon et al.

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