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:
Oct. 23, 1979
Filed:
Jun. 16, 1978
Jack L Anderson, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An adder provides either binary or binary coded decimal operation under the selection of a control input. The data inputs are a pair of four bit operands and a carry in for providing an additional capability of greater than four bits. Outputs, in addition to the four bit result, include carry propagate and carry generate signals for the four bit group. Binary operation is conventional. For binary coded decimal operation, the adder corrects an initial binary result to the binary coded decimal format by adding six when there is a group carry generate signal present thus forming an intermediate result. This intermediate result is formed before the occurrence of the carry in from a preceding stage. In the final stage of the adder, the intermediate result is incremented to form the final four bit result if there is a carry in.