A frequency control circuit including a control circuit for setting a set value, an adding circuit for adding the set value per unit time and effecting counting based on the adding result, and a signal output circuit for outputting an alternating signal of a cycle corresponding to the time necessary for the count result by the adding circuit to reach a target value. The control circuit sets the set value as a value which does not correspond to a submultiple of the target value, and the adding circuit starts the counting of a next cycle when the count result reaches the target value. The control circuit further sets an initial value of the counting of the next cycle in accordance with a value of a portion of the adding results, exceeding the target value when the count result reaches the target value.

 
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