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. 09, 2008
Filed:
Jan. 19, 2005
Masafumi Inoue, Tokyo, JP;
Takanaga Yamazaki, Tama, JP;
Takeshi Kataoka, Tokyo, JP;
Hideo Kubota, Higashi-murayama, JP;
Satoshi Tanaka, Tachikawa, JP;
Hirokazu Komori, Okazaki, JP;
Takahiro Gotoh, Ichinomiya, JP;
Masafumi Inoue, Tokyo, JP;
Takanaga Yamazaki, Tama, JP;
Takeshi Kataoka, Tokyo, JP;
Hideo Kubota, Higashi-murayama, JP;
Satoshi Tanaka, Tachikawa, JP;
Hirokazu Komori, Okazaki, JP;
Takahiro Gotoh, Ichinomiya, JP;
Renesas Technology Corp., Tokyo, JP;
Denso Corporation, Aichi, JP;
Abstract
This invention provides a data processing system capable of performing an interrupt exception handling routine as many times as the number of times of occurrence of a request event for the same interrupt exception handling routine if the request event occurs a plurality of times. A software interrupt counter or a hardware interrupt counter for retaining the number of times of occurrence of an interrupt request generation event counts up when a software processing which generates a software interrupt or a hardware event that generates a hardware interrupt occurs, and counts down when a CPU performs a processing for removing the interrupt request. If the value of the software interrupt counter and the value of the hardware interrupt counter are not zero, a software interrupt request signal and a hardware interrupt request signal to the CPU are asserted.