HD6433636SW datasheet(101/418 Pages) RENESAS

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Section 5 Power-Down Modes

5.1

Overview

The H8/3637S Series has seven modes of operation after a reset. These include six power-down

modes, in which power dissipation is significantly reduced.

Table 5.1 gives a summary of the seven operation modes.

Table 5.1

Operation Modes

Operating Mode

Description

Active (high-speed) mode

The CPU runs on the system clock, executing program

instructions at high speed

Active (medium-speed) mode

The CPU runs on the system clock, executing program

instructions at reduced speed

Subactive mode

The CPU runs on the subclock, executing program instructions

at reduced speed

Sleep mode

The CPU halts. On-chip peripheral modules continue to operate

on the system clock.

Subsleep mode

The CPU halts. Timer A, and timer G, continue to operate on

the subclock.

Watch mode

The CPU halts. The time-base function of Timer A continues to

operate on the subclock.

Standby mode

The CPU and all on-chip peripheral modules stop operating

All but the active (high-speed) mode are power-down modes.

In this section the two active modes (high-speed and medium-speed) are 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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