Fujitsu MB90390 Series, Hardware Manual

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CHAPTER 8 LOW-POWER CONTROL CIRCUIT
8.1 Overview of Low-Power Consumption Mode
The MB90390 series has the following CPU operating modes, any of which can be used
depending on operating clock selection and clock operation control:
• Clock mode (PLL clock mode or main clock mode)
• CPU intermittent operating mode (PLL clock intermittent operating mode or main
clock intermittent operating mode)
• Standby mode (sleep mode, time-base timer mode or stop mode)
■
CPU Operating Modes and Current Consumption
Figure 8.1-1 shows the relationship between the CPU operating modes and current consumption.
Figure 8.1-1 CPU Operating Mode and Current Consumption
Current consumption
Several tens
of mA
CPU operating
mode
PLL clock mode
Multiplied-by-eight clock
Multiplied-by-six clock
Main clock mode (1/2 clock mode)
Main clock intermittent operating mode
Standby mode
Sleep model
Time-base timer mode
Stop mode
Several mA
Several
μ
A
Lo w -po w er consumption mode
Multiplied-by-t w o clock
Multiplied-by-one clock
PLL clock intermittent
operating mode
Multiplied-by-eight clock
Multiplied-by-six clock
Multiplied-by-t w o clock
Multiplied-by-one clock
Note:
This figure is only an indication of the degree of po
w er consumption for each mode. Actual current
consumption values may not agree w ith those in the figure.
Multiplied-by-four clock
Multiplied-by-three clock
Multiplied-by-four clock
Multiplied-by-three clock