| 摘要 |
PURPOSE: An electronic circuit is provided to prevent the malfunction of an oscillator by setting proper power impedance in an oscillator of a lower frequency according to an operating mode. CONSTITUTION: Starting and halting of the three oscillators(11,12,13) are controlled by a CPU(10). That is, the CPU controls an operation mode switching unit(15) in accordance with a program stored in a ROM(Read Only Memory)(14). The operation mode switching unit outputs corresponding each of control signals(S1,S2,S3) to the high frequency oscillator, the medium frequency oscillator or the low frequency oscillator, respectively, based on programmed instructions from the CPU. That is, the control signal(S1) is turned to an H level to put the high frequency oscillator into operation in a high speed operation mode, the control signal(S2) is turned to the H level to put the medium frequency oscillator into operation in a medium speed operation mode, and the control signal(S3) is turned to the H level to put the low frequency oscillator into operation in a low speed operation mode.
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