| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a superior information processing system which can drop or stop the operation frequency of CPU at appropriate timing even while asynchronous communication is executed with a peripheral equipment. SOLUTION: This system includes a CPU 11 which can be operated at a regular mode and a power saving mode whose power consumption is lower than the regular mode, one or more peripheral equipments 17, 23, buses 12, 16 and 22 for making communication between the peripheral equipments 17, 23 and CPU 11, a bus cycle detection means for monitoring a bus cycle on the buses, a state judgment means for deciding the operation mode of the CPU 11 in a specified bus cycle detected by the bus cycle detection means and a signal generation means for transmitting a control signal for switching the operation mode based on a judgment result by the state judgment means to the CPU 11.</p> |
