| 摘要 |
<p>PURPOSE:To secure the complete initialization of a microprocessor, etc. even in an application mode of a power supply or in case the power supply is applied again immediately after its break, by monitoring the power supply voltage and the clock for output of the resetting signal. CONSTITUTION:When a power supply is applied by a switch SW, the power supply voltage VCC is supplied to a microprocessor 13 and an oscillating circuit 12. A clock detecting circuit 14 rectifies the clocks given from the circuit 12 and detects the stable supply of these clocks. This detection output is added with the voltage VCC by a bias circuit 15 and this voltage is integrated by an integration circuit 16. Then a resetting signal generating circuit 17 produces the resetting signal in response to the output level of the circuit 16 and applies it to the processor 13. In such a way, the resetting signal is obtained by monitoring the power supply voltage and the clock. Thus the complete initialization is secured with a microprocessor, etc. even in case a power supply is applied or applied again immediately after its break.</p> |
