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HD64F36024FX Datasheet, PDF (97/386 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents | |||
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Section 6 Power-Down Modes
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 Ïosc, Ïosc/8, Ïosc/16, Ïosc/32, and Ïosc/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 Register Descriptions
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)
LPW3003A_000020020200
Rev. 4.00 Sep. 23, 2005 Page 69 of 354
REJ09B0025-0400
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