| 摘要 |
<p>PURPOSE:To restrict consumed electric power of a computer by recognizing unoperated condition under power on condition, and switching the feed voltage of an IC device from the normal voltage to a retention voltage. CONSTITUTION:When it is judged that CPU2 in a control portion 1 under power- on condition, is unoperated condition and a feed voltage switching request indication key 24 is pressed, the unoperated condition of a CPU2 is recognized and an HOLD request latch 21 is set to keep CPU2 in an HOLD condition. When the CPU enters HOLD condition, the output of an AND gate 20 goes to HIGH level, a transistor Q214 is brought into an OFF condition and the feed voltage of an LSi4 for a clock, and a statick RAM5 are prepared to be fed to retain data from a charger. Next, under the operation, HOLD request latch is rest to release the HOLD of CPU2 and the transistor Q214 is brought to the ON condition and the same voltage as the operated condition is fed.</p> |
