H838532H datasheet(69/508 Pages) RENESAS

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Section 2 CPU

Rev. 1.00 May 30, 2008 Page 49 of 484

REJ09B0436-0100

2.7

CPU States

There are four CPU states: the reset state, program execution state, program halt state, and

exception-handling state. The program execution state includes active (high-speed or medium-

speed) mode and subactive mode. For the program halt state, there are sleep (high-speed or

medium-speed) mode, standby mode, watch mode, and subsleep mode. These states are shown in

figure 2.11. Figure 2.12 shows the state transitions. For details on program execution state and

program halt state, refer to section 5, Power-Down Modes. For details on exception handling, refer

to section 3, Exception Handling.

CPU state

Reset state

Program execution state

Active (high-speed) mode

Active (medium-speed) mode

Subactive mode

Sleep (high-speed) mode

Sleep (medium-speed) mode

Standby mode

Watch mode

Subsleep mode

Program halt state

A state in which the CPU

operation is stopped to

reduce power consumption

A transient state in which the CPU changes

the processing flow due to a reset or an interrupt

Exception-handling state

The CPU is initialized

The CPU executes successive program

instructions at high speed,

synchronized by the system clock

The CPU executes successive

program instructions at

reduced speed, synchronized

by the system clock

The CPU executes successive

program instructions at reduced

speed, synchronized by the subclock

Figure 2.11 CPU Operating States

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