H838024 datasheet(161/697 Pages) RENESAS

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Section 5 Power-Down Modes

Rev. 7.00 Mar 10, 2005 page 119 of 652

REJ09B0042-0700

Section 5 Power-Down Modes

5.1

Overview

The 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 and all on-chip peripheral functions are 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 1/128, 1/64, 1/32, or 1/16 of the system clock

frequency

Subsleep mode

The CPU halts. The time-base function of timer A, timer C,

timer F, timer G, SCI3, 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.

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