| 摘要 |
<p>PURPOSE:To reduce power consumption and to miniaturize a back-up power source and to reduce the cost of a computer system by using a clock control circuit which controls the action clock applied to a CPU based on the detection of a prescribed input in addition to a clock generating circuit and the CPU. CONSTITUTION:When a commercial power supply is interrupted, a back-up power source 2 starts the energizing. Then the interruption of the commercial power source is detected at one of input points 9-1-9-m. A signal obtained based on said detection is fetched by an input detecting part 50 and the data showing the cut-off of the commercial power supply is given to a control part 30. Thus a CPU 31 sends said data to a center via a MODEM, a network control part NCU and transmission line 7. When the transmission is over, an action end signal is applied to one of those points 9-1-9-m. The part 50 sends the signal of an L level to a signal line 11 owing to said action end signal. As a result, an AND gate 8 is closed and the supply of an action clock is stopped to the CPU 31. Then a low power consumption mode is secured.</p> |
