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:
Mar. 28, 2000
Filed:
Oct. 23, 1997
Kazuhiko Hara, Hyogo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A central processing unit includes an adder dedicated to address calculation provided separately from an ALU, a first address data route connected to a program counter and a stack pointer register, a second address data route connected to a prefetch que, a predecoder for determining whether an instruction to be executed calls for an addressing mode whereby a value in the program counter or the SP register is added to an immediate address in an instruction code. With this arrangement, if the addressing mode is called for, address calculation by the adder is performed concurrently with computation using an operand for another instruction, in accordance with a control signal output by the predecoder.