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:
Jun. 01, 1999
Filed:
Apr. 28, 1997
Junichi Nakata, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a microcomputer including a central processing unit (CPU), a user mode interrupt control circuit for generating a user mode interrupt request signal and transmitting the user mode interrupt request signal to the CPU, and a supervisor mode interrupt control circuit for generating a supervisor interrupt request signal, a selector circuit is connected to the CPU, the user mode interrupt control circuit and the supervisor mode interrupt control circuit. When the selector circuit is in a first state, the supervisor mode interrupt request signal is transmitted from the supervisor mode interrupt control circuit directly to the CPU. When the selector is in a second state, the supervisor mode interrupt request signal is transmitted from the supervisor mode interrupt control circuit via the user mode interrupt control circuit to the CPU.