Method and apparatus for switching between clock generators only

Details Method and apparatus for switching between clock generators only Method and apparatus for switching between clock generators only

1995-04-27

1997-01-14

Barry, Lance L.

Boots, shoes, and leggings

39518401, 364DIG1, 3642702, G06F 108

Patent

active

055948952

ABSTRACT:
Method and apparatus for providing a microprocessor with a divide by one frequency generator, while permitting the external clock driving the generator to vary in frequency without interruption of the operations of the microprocessor. A divide by two clock generator is also provided on the microprocessor chip. When a change in the frequency of the external clock is desired a request signal is provided to the chip. After a period of time has elapsed that permits the microprocessor to achieve a "safe" mode in which processing integrity is maintained even if the clock signal is interrupted, the divide by two clock generator is switched into operation. The external clock is then allowed to change frequency after which the divide by one clock generator is reactivated, following a period of time sufficient to allow the divide by one clock generator to stabilize.

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