Datasheet

Section 6 Power-Down Modes
Rev. 2.00 Jul. 04, 2007 Page 101 of 692
REJ09B0309-0200
Section 6 Power-Down Modes
This LSI has eight modes of operation after a reset. These include a normal active (high-speed)
mode and seven power-down modes, in which power consumption is significantly reduced. The
module standby function reduces power consumption by selectively halting on-chip module
functions.
• Active (medium-speed) mode
The CPU and all on-chip peripheral modules are operable on the system clock. The system
clock frequency can be selected from φ
OSC
/8, φ
OSC
/16, φ
OSC
/32, and φ
OSC
/64.
• Subactive mode
The CPU and all on-chip peripheral modules are operable on the subclock. The subclock
frequency can be selected from φ
W
/2, φ
W
/4, and φ
W
/8.
• Sleep (high-speed) mode
The CPU halts. On-chip peripheral modules are operable on the system clock.
• Sleep (medium-speed) mode
The CPU halts. On-chip peripheral modules are operable on the system clock. The system
clock frequency can be selected from φ
OSC
/8, φ
OSC
/16, φ
OSC
/32, and φ
OSC
/64.
• Subsleep mode
The CPU halts. The on-chip peripheral modules are operable on the subclock. The subclock
frequency can be selected from φ
W
/2, φ
W
/4, and φ
W
/8.
• Watch mode
The CPU halts. The on-chip peripheral modules are operable on the subclock.
• Standby mode
The CPU and all on-chip peripheral modules halt.
• Module standby function
Independent of the above modes, power consumption can be reduced by halting on-chip
peripheral modules that are not used in module units.
Note: In this manual, active (high-speed) mode and active (medium-speed) mode are collectively
called active mode, and sleep (high-speed) mode and sleep (medium-speed) mode are
collectively called sleep mode.