| 摘要 |
PURPOSE:To reduce the power consumption, by determining the dynamic memory operation frequency at standby corresponding to the ambient temperature at that time. CONSTITUTION:At standby mode, the signal inputted to the timing signal generating circuit 10 is selected from the output of the pulse oscillator 9 to the output of the frequency divider 8, the ambient temperature of CCD memory is read in at the sensor 4 and given to the conversion table 6 with A/D conversion 5, and the frequency dividing value to generate the minimum operation frequency of CCD memory to the ambient temperature at that time is set to the prescaler 7 from the table 6. The frequency divider 8 counts the output a of the oscillator 9 with this set value, the frequency dividing output is delivered to the circuit 10 every time reaching the set value, and the output of the circuit 10 drives the unit 3. Further, the circuit 10 alters the set value of the prescaler every given time. |
