OSCILLATING CIRCUIT

PURPOSE:To prevent information stored in a storage circuit from being erased by stopping the operation of an oscillating circuit at the time of reduction of a battery voltage. CONSTITUTION:When the voltage of a battery 12 is reduced to the level of a detection voltage, a battery voltage detecting circuit 9 inverts the potential level of the control signal from an output terminal O to not only make a MOSFET 6 to the conductive state but also make MOSFETs 4 and 5 to the nonconductive state and equalizes the input of an inverting amplifier 11 to the voltage of a power source VDD and cuts off a bias resistance. By this constitution, the oscillating circuit is stopped without flowing a current to the bias resistance to keep the battery voltage. Thus, the internal state of the circuit is kept without reducing the battery voltage, and information stored in the storage circuit is prevented from being erased.