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:
Apr. 21, 1992
Filed:
Dec. 11, 1990
Bradley G Heaney, Mountain View, CA (US);
Jehanbux J Edulbehram, Sunnyvale, CA (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
An input to the control unit of a microprocessor places the microprocessor in a WAIT condition whenever the input clock frequency is determined to be greater than a predetermined maximum value. An RC circuit in combination with a Schmitt trigger generates a 'kill signal' whenever the time interval between successive clock pulses is less than a value corresponding to a cut-off frequency. To assure that the microprocessor is not placed in a WAIT state by an occasional 'glitch' on the clock input, the kill signal applied to the microprocessor control unit is provided from a four-bit counter. If the Schmitt trigger generates a kill signal on eight consecutive clock cycles, the counter output changes state and sequencing of microcode by the control unit is suspended.