| 摘要 |
<p>Data input through a key switch (3) is displayed on a liquid crystal display (2) and is stored in an EEPROM (7). The data stored in the EEPROM (7) is immediately read out to check whether the read data coincide with the input data. If the data stored in the EEPROM (7) and read out therefrom does not coincide with the input data, the input data is stored again. If the input data cannot be stored in the EEPROM (7) after storage operation is performed a predetermined number of times, a CPU (4) determines, on the basis of a signal from a battery voltage detecting circuit (10), whether a voltage applied from a power supply circuit (8) to the EEPROM (7) exceeds a predetermined voltage. On the basis of this determination result, the CPU (4) causes the liquid crystal display (2) to display a cause for the disabled storage operation with respect to the EEPROM (7). <IMAGE></p> |
