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6.1
Overview
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. Table 6.1
summarizes the six operating modes.
Table 6.1
Operating Modes
Operating Mode
Active mode
Subactive mode
Sleep mode
Subsleep mode
Standby mode
Module standby mode
6.1.1
Register Configuration
Table 6.2 shows the power-down mode register configuration.
Table 6.2
Power-down Mode Registers
Name
System control register 1
System control register 2
Module standby control
register 1
Section 6 Power-down Modes
Description
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. For details,
see 6.2.2, System Control Register 2.
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.
The CPU halts. On-chip peripheral functions are operable on
the system clock.
The CPU halts. On-chip peripheral functions are operable on
the subclock.
The CPU and all on-chip peripheral modules halt. When the
clock time-base function is selcted, timer A is operable.
The on-chip peripheral modules specified by software stop
operating. For details, see 6.2.3, Module Standby Control
Register 1.
Abbreviation
SYSCR1
SYSCR2
MSTCR1
R/W
Initial Value
R/W
H'00
R/W
H'00
R/W
H'00
Address
H'FFF0
H'FFF1
H'FFF9
81
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