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:
Mar. 28, 1989
Filed:
Jun. 24, 1986
Hajime Matsumoto, Tokyo, JP;
Nec Corporation, Tokyo, JP;
Abstract
A data processing system has a main memory unit (MMU) and an execution processing unit (EPU). The performance of the EPU is enhanced during interrupt processing by providing a basic processor status (BPS) storage and an extended processor status (EPS) storage. The status of the EPU is divided into the BPS and EPS, the BPS containing the contents of a general register that are frequently stored during interrupt processing, and the EPS containing the contents of registers infrequency stored during interrupt processing. The status of the EPU can be saved at any desired address location of the MMU designated by current and new processor status block (PSB) pointers that can be programmably altered. In addition, the address designated by the current and new PSB pointers can be set as logical or absolute addresses.