Fujitsu F2MC-16LX Hardware Manual page 145

Mb90470 series 16-bit microcontroller
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I Clock modes
❍ PLL clock mode
This mode operates the CPU and peripheral functions by using the PLL multiplication clock of
the oscillation clock (HCLK).
❍ Main clock mode
This mode operates the CPU and peripheral functions by using the clock of the oscillation clock
(HCLK) divided by two. The PLL multiplier circuit stops its operation in the main clock mode.
❍ Sub-clock mode
This mode operates the CPU and peripheral functions by using the sub-clock (SCLK). The main
clock and the PLL multiplier circuit stop their operation in the sub-clock mode.
Reference:
Refer to Section 5.4 "Clock Modes", for more information on clock modes.
I CPU intermittent operation mode
The CPU intermittent operation mode operates the CPU intermittently while supplying a high-
speed clock to the peripheral functions, thereby reducing power consumption. This mode inputs
an intermittent clock only to the CPU while the CPU accesses registers, built-in memory,
peripheral functions, and external devices.
I Standby mode
The standby mode reduces current consumption by stopping supply of a clock to the CPU by
using the low-power control circuit (sleep mode), stopping supply of a clock to the CPU and
peripheral functions (timebase timer mode), and stopping oscillation clocks (stop mode).
❍ PLL sleep mode
The PLL sleep mode stops the CPU operation clock in the PLL clock mode. Devices other than
the CPU are operated by the PLL clock.
❍ Main sleep mode
The main sleep mode stops the CPU operation clock in the main clock mode. Devices other
than the CPU are operated by the main clock.
❍ Sub sleep mode
The sub sleep mode stops the CPU operation clock in the sub-clock mode. Devices other than
the CPU are operated by the sub-clock.
❍ Timebase timer mode
The timebase timer mode stops clocks and operations other than the oscillation clock, timebase
timer, and watch timer. Functions other than the timebase timer and watch timer are stopped.
❍ Watch mode
The watch mode operates only the watch timer. In this mode, only the sub-clock operates. The
main clock and PLL multiplier circuit are stopped.
CHAPTER 6 LOW-POWER CONSUMPTION MODE
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