HD64F36024 datasheet(95/384 Pages) RENESAS

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Section 6 Power-Down Modes

LPW3003A_000020020200

Rev. 4.00 Sep. 23, 2005 Page 69 of 354

REJ09B0025-0400

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

φosc, φosc/8, φosc/16, φosc/32, and φosc/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.

6.1

The registers related to power-down modes are listed below.

• System control register 1 (SYSCR1)

• System control register 2 (SYSCR2)

• Module standby control register 1 (MSTCR1)

• Module standby control register 2 (MSTCR2)

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