The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1981
Filed:
Jan. 04, 1979
Abstract
In a data processing apparatus including an instruction register and an instruction decoder connected therewith, when a designation instruction (operand changing instruction) is set in the instruction register, the operand (the code of source or destination) of the designation instruction is registered in a source address register or a designation address register connected to the instruction register through a gate circuit. The registers produce control signals through decoders respectively for selecting predetermined operands. When the designation instruction is decoded by the instruction decoder a first (for source) and a second (for destination) flip-flop circuits which are connected to the output terminal of the instruction decoder are set. The outputs of these flip-flop circuits are applied to the negative input of an AND gate circuit connected to the instruction decoder. When an instruction to be executed subsequent to the designation instruction is decoded by the instruction decoder, the instruction decoder produces a control signal that selects the operand of the instruction, but this control signal is selectively blocked by the AND gate circuit, with the result that the operand designated by the designation instruction is substituted by the operand of the instruction to be executed subsequently.