Fujitsu FR81S User Manual
CHAPTER 5: CLOCK
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CLOCK
FUJITSU SEMICONDUCTOR CONFIDENTIAL
78
5.6. The Clock Gear Circuit
The clock gear circuit is shown.
When the main clock is switched to the PLL/SSCG clock or the PLL/SSCG clock is switched to the main
clock, the power supply current fluctuates widely because the frequency fluctuates rapidly. Using the clock
gear circuit in the part of the clock switching can gradually fluctuate the operating frequency from a low
frequency to a high frequency or from a high frequency to a low frequency and therefore can reduce the
fluctuation of the power supply current.
MB91520 Series
MN705-00010-1v0-E
239