| 摘要 |
<P>PROBLEM TO BE SOLVED: To initialize data through a simple initializing procedure by once disconnecting a battery and then reconnecting the same when adopting a configuration for storing data in a nonvolatile memory instead of a volatile memory. <P>SOLUTION: When a battery 22 is connected to an ECU 21, a simple power supply circuit 49 generates a simple power supply voltage Vp2 from a voltage VBATT of a power supply line 28, and a power-on reset circuit 51 shifts a reset signal Sr to L. A latch circuit 50 outputs a battery state signal Sb of H indicating that the battery 22 has been disconnected. Thereafter, when an ignition switch 23 is turned on, a main processor 34 of a microcomputer 33 initializes a flash memory 35 on condition that the battery state signal Sb is at H, and then outputs a setting signal Ss to a power supply IC32. <P>COPYRIGHT: (C)2013,JPO&INPIT |
