HD6433644R datasheet(107/549 Pages) RENESAS

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Section 5 Power-Down Modes

Rev. 6.00 Sep 12, 2006 page 87 of 526

REJ09B0326-0600

Section 5 Power-Down Modes

5.1

Overview

The H8/3644 Group has eight modes of operation after a reset. These include seven power-down

modes, in which power dissipation is significantly reduced. Table 5.1 gives a summary of the eight

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

Active (medium-speed) mode

The CPU and all on-chip peripheral functions are operable on

the system clock, but at 1/64, 1/32, 1/6, or 1/8* the speed in

active (high-speed) mode

Subactive mode

The CPU, and the time-base function of timer A are operable

on the subclock

Sleep (high-speed) mode

The CPU halts. On-chip peripheral functions except PWM are

operable on the system clock

Sleep (medium-speed) mode

The CPU halts. On-chip peripheral functions except PWM are

operable on the system clock, but at 1/64, 1/32, 1/6, or 1/8* the

speed in active (high-speed) mode

Subsleep mode

The CPU halts. The time-base function of timer A are operable

on the subclock

Watch mode

The CPU halts. The time-base function of timer A is operable

on the subclock

Standby mode

The CPU and all on-chip peripheral functions halt

Note:

* Determined by the value set in bits MA1 and MA0 of system control register 1

(SYSCR1).

Of these eight 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, and the two sleep modes (high-speed and medium speed) will be referred to

collectively as sleep 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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