Section 27 Power-Down Modes - Renesas H8S/2158 User Manual

For operating modes after the reset state is cancelled, this LSI has not only the normal program
execution state but also seven power-down modes in which power consumption is significantly
reduced. In addition, there is also module stop mode in which reduced power consumption can be
achieved by individually stopping on-chip peripheral modules.
• Medium-speed mode
System clock frequency for the CPU operation can be selected as φ/2, φ/4, φ/8, φ/16,or φ/32.
• Subactive mode
The CPU operates based on the subclock and on-chip peripheral modules other than TMR_0,
TMR_1, WDT_0, and WDT_1 stop operating.
• Sleep mode
The CPU stops but on-chip peripheral modules continue operating.
• Subsleep mode
The CPU and on-chip peripheral modules other than TMR_0 , TMR_1, WDT_0, and WDT_1
stop operating.
• Watch mode
The CPU and on-chip peripheral modules other than WDT_1 stop operating.
• Software standby mode
Clock oscillation stops, and the CPU and on-chip peripheral modules stop operating.
• Hardware standby mode
Clock oscillation stops, and the CPU and on-chip peripheral modules enter reset state.
• Module stop mode
Independently of above operating modes, on-chip peripheral modules that are not used can be
stopped individually.
LPWS263A_000020020300

Section 27 Power-Down Modes

Section 27 Power-Down Modes
Rev. 3.00 Jan 25, 2006 page 771 of 872
REJ09B0286-0300