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Rev. 1.0, 07/01, page 69 of 372
Section 6 Power-down Modes
This LSI has six modes of operation after a reset. These include a normal active mode and four
power-down modes, in which power dissipation is significantly reduced. The module standby
mode reduces power dissipation 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.
•
Subactive mode
The CPU and all on-chip peripheral modules are operable on the subclock. The subclock
frequency can be selected from øw/2, øw/4, and øw/8.
•
Sleep mode
The CPU halts. On-chip peripheral functions are operable on the system clock.
•
Subsleep mode
The CPU halts. On-chip peripheral functions are operable on the subclock.
•
Standby mode
The CPU and all on-chip peripheral modules halt. When the clock time-base function is
selcted, timer A is operable.
•
Module standby mode
The on-chip peripheral modules specified by software stop operating.
6.1 Register Descriptions
The registers related to power-down modes are listed below. For details on register addresses and
register states during each processing, refer to section 19, Internal I/O Registers.
•
System control register 1(SYSCR1)
•
System control register 2(SYSCR2)
•
Module standby control register 1(MSTCR1)
LPW3003A0000_000020010700