HD64F3670 Datasheet, PDF (89/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Section 6 Power-Down Modes
This LSI has five modes of operation after a reset. These include a normal active mode and three
power-down modes, in which power consumption is significantly reduced. Module standby mode
reduces power consumption by selectively halting on-chip module functions.
• Active mode
The CPU and all on-chip peripheral modules are operable on the system clock. The system
clock frequency can be selected from øosc, øosc/8, øosc/16, øosc/32, and øosc/64.
• Sleep mode
The CPU halts. On-chip peripheral modules are operable on the system clock.
• Standby mode
The CPU and all on-chip peripheral modules halt.
• Subsleep mode
The CPU and all on-chip peripheral modules halt. I/O ports keep the same states as before the
transition.
• Module standby mode
Independent of the above modes, power consumption can be reduced by halting on-chip
peripheral modules that are not used in module units.
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