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:
Jun. 06, 1995
Filed:
Feb. 23, 1993
Applicant:
Inventors:
Kenji Oonishi, Hyogo, JP;
Tsunenori Umeki, Hyogo, JP;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395800 ; 364736 ; 3642328 ; 3642580 ; 3642591 ; 364D / ;
Abstract
For obtaining a central processing unit to perform, with the same operation code, an operation in which a carry input is effective and an operation in which the carry input is invalid or an operation in which a borrow input is effective and an operation in which the borrow input is invalid, between an output of a carry and borrow flag and a carry and borrow input of an ALU there is provided a switching circuit to switch the input of the ALU by a control signal different from a control signal of the central processing unit due to an operation code.