| 摘要 |
PURPOSE:To prevent the abnormality of operation and the runaway of a program by backing up a volatile memory in a development controlling microcomputer by a battery and resetting a control/operation means at the drop of power supply voltage. CONSTITUTION:When a power supply voltage monitoring means 28 in a system control auxiliary device 27 detects the drop of the power supply voltage and the output of the means 28 is turned to the L level, a TR31 is turned off and an RAM19 in the control/operation means including a CPU18 for automatic development is connected to the battery 34 and backed up by the battery 34. On the other hand, a low level detecting output from the means 28 is applied to the CPU18 as a reset signal through an inverter 29 and the control/operation means is reset and set up to the initial status, so that the generation of the operation abnormality, program runaway, etc. based upon the drop of the power supply voltage is prevented. |
