Intel Corporation

Jehanbux J Edulbehram

Bradley G Heaney

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.

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Sunnyvale, CA, United States of America

Jehanbux J Edulbehram