| 摘要 |
<p>PURPOSE:To prevent a malfunction as well as to simplify the control stage of a power supply, by using data in which (n) bits are all ''1'' to the data on the OFF state of the power supply and threrefore by performing the control stage just by an erasing action. CONSTITUTION:When a switch C is turned on, a reset pulse generating circuit 5 generates a reset pulse E by the output voltage F of a power supply 4 of the control part. A control circuit 2 starts its operation when the pulse E is changed to a high level from a low level and after the voltage F is applied. In this case, a power supply 9 of a part B to be controlled is controlled by a power supply switch 7, and a control signal G is applied from the circuit 2. The self-supporting action is performed through the circuit 2 and a nonvolatile memory 3. When the electric power H of the input side of the switch 7 is cut off, the circuit 2 is reset to its initial state by the pulse E when the power H is applied later. Then the switch 7 is kept at a state set before the power H is cut off.</p> |
