Hitachi H8/3692 ユーザーズマニュアル

Rev. 1.0, 07/01, page 35 of 372

There are four CPU states: the reset state, program execution state, program halt state, and
exception-handling state. The program execution state includes active mode and subactive mode.
For the program halt state there are a sleep mode, standby mode, and sub-sleep 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 6, Power-Down Modes. For details on exception
processing, refer to section 3, Exception Handling.

CPU state

Reset state

Program

execution state

Program halt state

Exception-

handling state

Active

(high speed) mode

Subactive mode

Sleep mode

Subsleep mode

Power-down

modes

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 subclock

A state in which some 
or all of the chip 
functions are stopped 
to conserve power

A transient state in which the CPU changes 
the processing flow due to a reset or an interrupt

The CPU is initialized

Standby mode