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. 16, 1999
Filed:
Oct. 04, 1996
Atsushi Kiuchi, Kokubunji, JP;
Yuji Hatano, Kokubunji, JP;
Toru Baji, Inagi, JP;
Koki Noguchi, Tokyo, JP;
Yasushi Akao, Kokubunji, JP;
Shiro Baba, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In microcomputers and digital signal processors in which a central processing unit for controlling the entire system and a digital signal processing unit having a product sum function required to process digital signals efficiently are mounted on one and the same chippthis invention prevents an increase in the number of processing steps caused by differing types of data handled by the calculators, thereby enhancing the efficiency of the digital signal processing. The digital signal processing unit is made a calculation unit that handles fixed-point data, and an instruction calling for execution of a fixed-point data calculation is provided separately from the conventional integer calculation instruction. When, in the data transfer between the digital signal processing unit and memories or external circuits, data shorter in bit length than the calculation precision is transferred, the calculation unit has a function to input and output data to and from the higher-order side of the register in which the data is stored and the fixed point data transfer instruction is provided separately from the conventional integer data transfer instruction. This invention can eliminate additional correction processing necessitated when the integer data processing unit is made to execute the digitalsignal processing.