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:
Aug. 16, 2005
Filed:
Dec. 30, 2002
Motoki Higashida, Tokyo, JP;
Motoki Higashida, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
An electronic apparatus has in a CPU core an instruction correcting circuit that includes memory cells, a comparator and a selector. The memory cells store, when initializing the electronic apparatus, a correction address, a correction instruction and a correction enabling bit, which are associated with contents of a read-only memory. The comparator compares an instruction address output from an instruction prefetch stage of the CPU core with the correction address stored in the memory cells. The selector selects either an instruction code read from the instruction address of the read-only memory or the correction instruction stored in the memory cells in response to a compared result of the comparator. The electronic apparatus can correct the ROM data after manufacturing without reducing the number of available interrupts or the operation speed of the CPU.