| 摘要 |
checking a key input; counting a cancellation key input time after storing a hear retaining time in case of inputting the cancellation key; counting the cancellation key input time when the heat retaining not processed; in case of inputting a heat retaining key, checking whether a present heat retaining state is cancelled or not; in case of the heat retaining cancellation, comparing the cancellation key input time with a reference time; if the cancellation key input time is over the reference time, counting and displaying the heat retaining time; if it is below, displaying the heat retaining time stored in the second step; if there is not the present heat retaining cancellation in the third step, and displaying the stored heat retaining time and counting the displayed time and the stored time in succession.
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