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(iii) Many microprocessors have a specified lower limit on clock frequency (apart from the maximum clock frequency limit) because _____
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Clock frequency becomes low means time period of clock becomes high. When this time period increases beyond the time period in which the non-volatile memory contents must be refreshed, we loose those contents. So, clock frequency can't go below this value.

Ref: https://gateoverflow.in/261/microprocessors-specified-frequency-frequency-__________