HD64F36024 datasheet(63/384 Pages) RENESAS

63 / 384 page

Section 2 CPU

Rev. 4.00 Sep. 23, 2005 Page 37 of 354

REJ09B0025-0400

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 mode. In the program halt

state there are a sleep mode, and standby 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

Sleep 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

Figure 2.11 CPU Operation States

HD64F36024 Datasheet(PDF) 63 Page - Renesas Technology Corp