| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve storage holding characteristics by changing the storage part of a second storage means every time information is stored and storing the information of a maximum value among the information stored in the respective storage parts of the second storage means to a first storage means at the time of recovery after turning off a power source. SOLUTION: The using frequency information of a first door switch 7 which is the number of times of turning the first door switch 7 on and off is not eliminated even when the power source is off since it is rewritten from a counter DCNT to a storage part EEPROM and stored. Thus, when the number of times of turning it on and off which is the using frequency information of the first door switch 7 becomes the prescribed value of 100,000 times, the exchange period of the first door switch 7 is correctly reported to a microwave oven user by a display part 5. Further, in the storage part EEPROM, every time the digit of 10 of the contents of the counter DCNT is updated (the contents of the counter DCNT are changed for a fixed value), the contents of the counter DCNT are rewritten and stored to one of addresses A and B.</p> |
