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:
Jan. 12, 1999
Filed:
Jul. 26, 1996
Stephen H Chan, Sunnyvale, CA (US);
Zilog, Inc., Campbell, CA (US);
Abstract
A flexible interrupt system for presenting interrupt signal to a microcontroller located on an integrated circuit responds to either on chip or off chip components. An interrupt circuit is connected to each bonding pad and is also connected to interrupt control logic which establishes priority for interrupt signals from the components located on chip. All interrupt signals pass through a common node in the interrupt circuit. A p channel transistor and a n channel transistor connected to the common node function as a pull up or pull down so that the microcontroller senses the rising or falling edge of the interrupt request. Since the interrupt request signals from either on chip components or off chip components pass through the common node, and the common node is directly coupled to a pad, system development and debug is simplified.