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:
Dec. 06, 2005
Filed:
Aug. 09, 2000
Hiroyuki Takahashi, Tochigi, JP;
Hiroyuki Takahashi, Tochigi, JP;
PENTAX Corporation, Tokyo, JP;
Abstract
A microcomputer has a ROM with pre-stored programs, a RAM storing a revision program for executing an interruption-processing, and a program counter in which an address is successively renewed during an execution of the ROM-stored programs. A first register stores a comparison address corresponding to an optional address of the ROM-stored programs, at which an interruption-processing should be executed to virtually revise the ROM-stored programs. A second register stores a vector address data corresponding to a head address of the revision program. An address comparator compares the comparison address data with a renewed address of the program counter. A controller/calculator makes an access to the head address of the revision program, corresponding to the vector address data of the second register, when there is a coincidence between the comparison address data and the renewed address of the program counter, resulting in an execution of the interruption-processing in accordance with the revision program.