Datasheet

Section 5 Power-Down Modes
Rev. 6.00 Aug 04, 2006 page 131 of 680
REJ09B0145-0600
Section 5 Power-Down Modes
5.1 Overview
This LSI has nine modes of operation after a reset. These include eight power-down modes, in
which power dissipation is significantly reduced. Table 5.1 gives a summary of the nine operating
modes.
Table 5.1 Operating Modes
Operating Mode Description
Active (high-speed) mode The CPU and all on-chip peripheral functions are operable on the
system clock in high-speed operation
Active (medium-speed) mode The CPU and all on-chip peripheral functions are operable on the
system clock in low-speed operation
Subactive mode The CPU is operable on the subclock in low-speed operation
Sleep (high-speed) mode The CPU halts. On-chip peripheral functions are operable on the
system clock
Sleep (medium-speed) mode The CPU halts. On-chip peripheral functions operate at a
frequency of 1/64, 1/32, 1/16, or 1/8 of the system clock frequency
Subsleep mode The CPU halts. The time-base function of timer A, timer C, timer
G, timer F, WDT, SCI1, SCI3-1, SCI3-2, AEC, and LCD
controller/driver are operable on the subclock.
Watch mode The CPU halts. The time-base function of timer A, timer F, timer
G, AEC, and LCD controller/driver are operable on the subclock.
Standby mode The CPU and all on-chip peripheral functions halt
Module standby mode Individual on-chip peripheral functions specified by software enter
standby mode and halt
Of these nine operating modes, all but the active (high-speed) mode are power-down modes. In
this section the two active modes (high-speed and medium speed) will be referred to collectively
as active mode.
Figure 5.1 shows the transitions among these operation modes. Table 5.2 indicates the internal
states in each mode.