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:
Sep. 24, 1996
Filed:
Apr. 29, 1994
David M Barrett, Tyngsboro, MA (US);
Mary Letourneau, Westmoreland, NH (US);
Patricia A Martin, Groton, MA (US);
J Michael McNally, Derry, NH (US);
Wang Laboratories, Inc., Billerica, MA (US);
Abstract
In a portable computer the BIOS software slows the system clock frequency during idle periods. The BIOS software returns the system to its normal operating frequency when an awaited event such as a keystroke occurs. In the event of an interrupt while the system clock is at the lower frequency, a hardware clock control circuit responds to the interrupt to promptly increase the system clock frequency to the normal value. By decoding the old frequency, new frequency and the several available frequencies, the change in frequency is timed to maintain proper phase and duty cycle without interruption.