| 摘要 |
In a circuit arrangement to be coupled to an electronic element (38), such as a microprocessor, and a power source circuit (21, 23, 24) providing a source voltage V which builds up at a transition to energize the electronic element and which is subjected to a momentary interruption and restoration therefrom, a detection circuit (55, 56) is coupled to the power source circuit to distinguish between the transition and the restoration by monitoring the source voltage to produce an enable signal only upon detection of the transition. Such distinction is possible by the use of a combination of a time constant section (55) with a switch (56). Responsive to the enable signal, a pattern generator (51) produces a pattern signal stored therein. A predetermined initial operation is carried out by the microprocessor in response to the pattern signal upon occurrence of the transition and is not carried out upon occurrence of the restoration. Thus, the electronic element is capable of continuing a previous operation prior to the momentary interruption. |
