| 摘要 |
<p>PURPOSE:To avoid the malfunction of a microcomputer which are caused after a power supply switch is cut off by providing a means which detects the difference between power supply voltages obtained by a power supply switch and the direct voltage of a power supply and applies a resetting signal to the microcomputer when said difference of voltage exceeds a prescribed level. CONSTITUTION:The difference between the power supply voltage level V2 led out to a line 23 from a power supply switch 22 and the power supply voltage level V1 led out directly to a line 35 from a battery 21 exceeds a prescribed level set by a level discriminating circuit 34, a resetting signal is applied to an initial resetting input terminal 26R of a central processing circuit 26. In such a constitution, the circuit 26 has no malfunction even though a resetting signal generating circuit 29 has a malfunction due to the inductiveness of a load 28 after the cut-off of the switch 22.</p> |
