| 摘要 |
PURPOSE:To prevent a defect of resetting due to noises, etc., by providing a means which works by a reset signal when said reset signal is delivered and continues the reset signal. CONSTITUTION:The power supply voltage VCC of an electronic device 2 of a microcomputer, etc. rises up completely when a fixed time elapses after application of a power supply. At the same time, the terminal voltage of a capacitor 3 which is charged via a resistance R5 rises up gradually and then exceeds the sum of the Zener voltage of a Zener diode 18 and the base-emitter voltage of a transistor TR15. Then the TR15 conducts to apply a reset signal to the device 2, and this signal makes a TR16 conduct. The conduction of the TR15 is held via the TR16. As a result, no effect is given to the reset signal even though the charging voltage of the capacitor 3 has variations. |
