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:
May. 17, 1988
Filed:
Dec. 27, 1984
Hitachi, Ltd., Tokyo, JP;
Abstract
A decimal multiplier device including a register A storing the multiplier, a register B storing the multiplicand, a shifter for outputting the output of the register A as it is or after having been shifted, based on a first signal, a gate for outputting the output of the register B or '0', based on a second signal, an adder/subtractor for adding the output of the shifter and that of the gate and storing the result thus obtained in the register A, and a decoder for receiving the value of a selected digit of the content of the register A and controlling the gate and the shifter by generating the first signal and the second signal based on the received value so that the multiplicand B is added n times, n corresponding to the received value, to the content of the register A or substracted (10-n) times therefrom. The register A, the shifter and the adder/subtractor form a single loop. Decimal multiplication is performed by controlling the shifter, when signals pass through the loop repeatedly.