| 摘要 |
PURPOSE:To prevent a human body stimulating device from producing the irregular pulses by avoiding the occurrence of the runaway of a microcomputer due to the drop of the power source voltage together with distinction secured between the application of a power source and the drop of the power source voltage. CONSTITUTION:A voltage monitor means 41 detects that a power source switch 13 is turned on and sends a reset signal to a microcomputer 21. Then the computer 21 immediately checks the potential of the output port of a time constant circuit 42 and starts execution of a normal routine when said potential is equal to L. The means 41 detects that the power source voltage drops less than a fixed level due to the temporary increase of load after consumption of a battery 12. Thus a reset signal is sent to the computer 21. Then the computer 21 immediately checks the potential of the output port of the circuit 42. In this case, said potential is equal to H since a considerable time elapsed from application of the power source. Thus the computer 21 stops its working. |
