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:
Feb. 24, 2004
Filed:
Jun. 21, 2000
Masahiro Kamiya, Nishio, JP;
Hideaki Ishihara, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
A microcomputer has a built-in memory and is accessible to an external memory. The microcomputer executes a specific area branch instruction “JM” as an executable instruction. The specific area branch instruction “JM” is a branch instruction restricted to jump to only a specific area of a memory space and is a single instruction having a minimum instruction length. The microcomputer allocates at least one of a real arithmetic subroutine, an integer division subroutine, and a bit handling subroutine to the specific area. A program of this microcomputer is configured to jump to the selected subroutine allocated to the specific area in response to the specific area branch instruction “JM”. Accordingly, the required program size can be reduced. When the programs are stored in the external memory, it becomes possible to suppress an increase of the execution time which is required for invoking each of the subroutines.