| 摘要 |
<p>PURPOSE:To prevent malfunction from being generated at the time of rising oscillation by connecting a circuit element to the input terminal of an oscillation circuit in which an inverter is coupled with an oscillator via a switching means controlled by the output signal of the oscillation circuit. CONSTITUTION:Capacitances 2 and 3, and a crystal oscillator 4 are connected to the input terminald 5 of the oscillation circuit consisting of an integrated circuit device 1. Also, the oscillation circuit is formed with the inverter 6 and feedback resistor 7. And the signal of a system clock source 8 is sent to a CPU10 by a Schmitt inverter 9 as a system clock. At the time of applying a power source, the CPU10 outputs a signal 12 which closes a switch 13. When stable oscillation is obtained, the CPU10 outputs the signal 12 which opens the switch 13. In such way, it is possible to prevent the malfunction due to an unarranged system clock generated from being generated, at the time of rising the oscillation, and also, to reduce power consumption after the rise of the oscillation.</p> |
