HD6473847RHV Datasheet, PDF (143/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 5 Power-Down Modes
Section 5 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 func-
tions.
• 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 φosc/16, φosc/32, φosc/64, and φosc/128.
• Subactive mode
The CPU and all on-chip peripheral modules are operable on the subclock. The subclock fre-
quency can be selected from φw/2, φw/4, and φw/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 φosc/16, φosc/32, φosc/64, and φosc/128.
• Subsleep mode
The CPU halts. The timer A, timer F, SCI3, AEC, and LCD controller/driver are operable on
the subclock. The subclock frequency can be selected from φw/2, φw/4, and φw/8.
• Watch mode
The CPU halts. Timer A's timekeeping function, timer F, AEC, and LCD controller/driver 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 pe-
ripheral 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.
Rev. 7.00 Mar. 08, 2010 Page 111 of 510
REJ09B0024-0700