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. 10, 1995
Filed:
Dec. 02, 1992
Matthew K Adams, Dallas, TX (US);
Wendell L Little, Denton, TX (US);
Stephen N Grider, Farmers Branch, TX (US);
Dallas Semiconductor Corporation, Dallas, TX (US);
Abstract
Interrupt circuitry for a processor comprises a plurality of interrupt inputs, an interrupt output, combinatorial logic with a plurality of combinatorial logic inputs connected to the plurality of interrupt inputs and with a combinatorial logic output connected to the interrupt output wherein an interrupt output signal at the interrupt output is a function of interrupt signals at the plurality of interrupt inputs; and an interrupt mode select connected to the combinatorial logic wherein an interrupt mode select signal from the interrupt mode select controls the function. The interrupt mode select signal from the interrupt mode select selects the function to be either AND or OR. The circuitry also comprises a mask register having a plurality of mask register inputs and a plurality of mask register outputs, the plurality of mask register inputs connected to the plurality of interrupt inputs and the plurality of mask register outputs connected to the plurality of combinatorial logic inputs wherein a mask register bit pattern in the mask register conditions a corresponding subset (possibly empty) of the interrupt signals at the plurality of interrupt inputs to make the function and the interrupt output signal at the interrupt output not depend upon the corresponding subset.