| 摘要 |
PROBLEM TO BE SOLVED: To prevent the use of the erroneous rewriting information of program contents accompanied by the runaway of program processing. SOLUTION: At the time of initializing one chip microcomputer, only when a latch circuit 28 latches a logical value '1', the boosting operation of a boosting circuit 17 is executed. When initialization is insufficient, the latch circuit 28 latches a logical value '0', and the value of an address register 3 is highly unlikely to be 0 address. Therefore, when the runaway of the program processing of the microcomputer is generated, the use of erroneous writing information in a flash memory 1 can be surely prevented.
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