| 摘要 |
<p>PROBLEM TO BE SOLVED: To control transition to a precise operation mode against an unforeseen operation by means of a user in a power switch controller having a constant voltage source, a backup power source and a control means which selectively switches the supply source of power voltage in accordance with the size relation of the output potentials of both sources. SOLUTION: If a detection result by a potential detection part 103 is not more than prescribed potential when the power of the constant voltage power 101 starts, a first voltage supply mode (sleep mode) is set. Potential is detected for the prescribed number of times at every prescribed time. When all detection potentials are not more than prescribed potential, a system is set to a second voltage supply mode (stop mode) whose power consumption is lower than the first supply mode, and power switch is completed.</p> |
