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:
Sep. 29, 1998
Filed:
Jul. 07, 1997
Kazuhiko Tanaka, Fujisawa, JP;
Tohru Nojiri, Tokyo-to, JP;
Keiji Kojima, Sagamihara, JP;
Kiyokazu Nishioka, Odawara, JP;
Yoshiki Kurokawa, Sakai-gun, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is provided an instruction supply unit 20 for generating addresses for each instruction when an interrupt occurs, from an interrupted instruction until an instruction to be executed later by the number of instructions contained in a delay slot of the instruction an interrupt control unit 50 for storing each address thus generated, and an instruction executing unit 30 for successively reading out each of the stored addresses from the address of the interrupted address after the interrupt processing is completed. The instruction executing unit 30 executes a branch instruction to the address which is first read out. Thereafter, with respect to the addresses which are read out secondly and subsequently, if the address is the branch destination address of the branch instruction, the instruction executing unit 30 executes the branch instruction to the address, and if the address is not the branch destination address, it executes an NOP instruction. Accordingly, even when the instruction length is not fixed, the interrupt can be accurately processed.