| 摘要 |
<P>PROBLEM TO BE SOLVED: To normally restart a CPU with reduced additional construction in a computer device even with a failure of a starting memory area, in which device operation failure of the CPU is detected by a watch dog timer and the CPU is restarted when the operation is abnormal. <P>SOLUTION: This device comprises a storage means having a first and second starting memory areas for storing the same starting program, respectively, and divided by the difference of 0 or 1 between high one bits of the addresses; a flip-flop circuit for outputting, at the time of watch dog resetting, a signal reversed from the one at the time of starting, and an EXOR circuit for receiving the output signal of the flip-flop circuit and the high one bit signal of an address signal outputted when the CPU accesses either the first or second starting memory area, and outputting a signal of their exclusive OR to the storage means as the high one bit of the address signal. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
