Fujitsu F2MC-16LX Hardware Manual page 159

Clock Mode
PLL clock mode
In PLL clock mode, the CPU and peripheral function operate on a PLL multiplying clock of oscillation
clock (HCLK).
Note:
When using USB Mini-HOST and the USB function, you need to set to the PLL clock mode.
Main clock mode
In main clock mode, the CPU and peripheral function operate on a clock with 2-frequency division of
oscillation clock (HCLK). In this mode, the PLL multiplying circuit stops.
Sub clock mode
In sub clock mode, the CPU and peripheral function operate on a sub clock (SCLK). In this mode, the main
clock and PLL multiplying circuit stop.
Reference:
For the clock mode, see section "5.4 Clock Mode".
CPU Intermittent Operation Mode
The CPU intermittent mode operates the CPU intermittently and lowers the power consumption while
supplying the high-speed clock to the peripheral functions. The CPU intermittent operation mode is a mode
for supplying intermittent clock only to the CPU when it makes access to the registers, internal memory,
peripheral functions, or external devices.
Standby Mode
Standby mode reduces the power consumption by the low-power consumption control circuit which stops
clock supply to the CPU (sleep mode), stops clock supply to the CPU and peripheral functions (timebase
timer mode), or stops the oscillation clock (stop mode).
PLL sleep mode
The PLL sleep mode terminates the CPU operation clock in the PLL clock mode and operates components
except for CPU under the PLL clock.
Main sleep mode
The main sleep mode terminates the CPU operation clock in the main clock mode and operates components
except for the CPU under the main clock.
CHAPTER 6 LOW-POWER CONSUMPTION MODE
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