| 摘要 |
<p>PROBLEM TO BE SOLVED: To operate an automatic power saving function even under a condition that something is placed on a key. SOLUTION: A micro controller 31 executes control for moving to a power down mode when prescribed time passes in a state where the key is not depressed or in a state where the key is depressed as it is. At the time of power down transfer, a flip lop 10 latches the state of a key matrix 2 and EX-OR gate IC12 compares the latched state of the key matrix 2 with the present state of the key matrix 2. When it judges that a change occurs in the state of the key matrix 2 from the output of EX-OR gate IC12, the micro controller 31 executes control for restoring a system to an operation mode.</p> |
