Therefore, CLKF is low for one cycle of CLKOSC. In the preferred embodiment, the inputs to the counters are set to a starting value which results in the CLKF signal having a period which is 1/100 of the period of CLKOSC. Thus, in the preferred embodiment, signal CLKF is a signal which is low for 0.02 milliseconds and high for 1.98 milliseconds, a frequency of 500 Hz.