| 摘要 |
PURPOSE:To realize the power saving function of rendering the power consumption zero dispensing with any crown stopper by arranging an external operation switch to provide an input signal based on the frequency of turning ON or OFF and then fixed at the OFF position after the inputting is performed for specified times. CONSTITUTION:When an external operation switch 6 is turned ON or OFF again before an oscillation controlling circuit 8 is reset with the rising of a frequency dividing circuit at 1Hz, Q outputs of FFs 8a and 8b go to '0' and '1' respectively. Furthermore, when the switch 6 is turned ON and OFF again before it is reset with the rising of the dividing circuit at 1Hz, the Q outputs of the FFs 8a and 8b move to '1' and '1' respectively while the output of a NAND gate 8c goes to '0'. As a result, an NMOS5 for cutting the power source of an oscillation circuit 1 connected to the output of the gate 8c and a PMOS 12 for fixing the output of the oscillation circuit 1 at VDD level are turned OFF and ON respectively. Thus, the power source of the oscillation circuit 1 is cut and the output level is fixed thereby stopping the action of the oscillation circuit 1 with the power consumption of zero. |
