| 摘要 |
<p>PURPOSE:To prevent an erroneous control operation at the time of hitting, etc. by providing a reset signal sending-out means for resetting the other microcomputer at the time when a normal control mode is recovered, on the microcomputer having a backup function, and also, providing a reset circuit and a backup circuit. CONSTITUTION:When a power supply voltage becomes below a normal operation range of a 1-chip microcomputer 8 having a backup function and reset signal generating information, a backup circuit 4 detects it, sends out a backup signal and migrates the microcomputer 8 to a backup mode. A reset circuit 2 sends out a reset signal and resets the microcomputer 8, when the microcomputer 8 which loses a control function recovers the control function by the backup mode. When the normal control function is recovered, the microcomputer 8 having the backup function sends out a reset signal to the other microcomputer 6 having no backup function and resets it. In such a way, even at the time of hitting, give-and-take of information are not interrupted, and an erroneous control operation is not executed.</p> |
