To provide the multiplying circuit of high precision by standardizing high frequency clocks from a CR oscillation circuit by using low frequency clocks from a crystal oscillation circuit and generating the high frequency clocks of the high accuracy.

When a battery is set to a clock and an operating state is attained, oscillation signals are outputted respectively from the crystal oscillation circuit 1 and the CR oscillation circuit 2. The oscillation signals from the circuit 1 are sent to a prescribed circuit part as reference signals for motor driving pulse generation. Then, the oscillation signals of a frequency from the circuit 2 are inputted to a counting circuit part 3 as clock signals and counted for the period of one cycle of the oscillation signals of the frequency from the circuit 1. The output of the circuit 3 is divided 5 and supplied to a matching circuit 7, and when matching with counted 6 signals which are the output of the circuit 2 is detected 7 there, the output is sent to a T-type floppy 8. Then, the output fout of a flip-flop 8 is turned to the communication signals of the high precision at the same level as the oscillation signals generated from the crystal oscillation circuit 1.