HD64F36049 datasheet(113/562 Pages) RENESAS

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Section 6 Power-Down Modes

Rev. 3.00 Mar. 15, 2006 Page 81 of 526

REJ09B0060-0300

6.2

Mode Transitions and States of LSI

Figure 6.1 shows the possible transitions among these operating modes. A transition is made from

the program execution state to the program halt state by executing a SLEEP instruction. Interrupts

allow for returning from the program halt state to the program execution state. A direct transition

between active mode and subactive mode, which are both program execution states, can be made

without halting the program. The operating frequency can also be changed in the same modes by

making a transition directly from active mode to active mode, and from subactive mode to

subactive mode.

RES input enables transitions from a mode to the reset state. Table 6.2 shows the

transition conditions of each mode after the SLEEP instruction is executed and a mode to return

by an interrupt. Table 6.3 shows the internal states of the LSI in each mode.

Reset state

Standby mode

Active mode

Sleep mode

Subsleep mode

Subactive

mode

Program halt state

Program execution state

Program halt state

SLEEP

instruction

SLEEP

instruction

Interrupt

Direct transition

interrupt

Direct transition

interrupt

Notes: 1. To make a transition to another mode by an interrupt, make sure interrupt handling is after the interrupt

is accepted.

2. Details on the mode transition conditions are given in table 6.2.

SLEEP

instruction

Direct

transition

interrupt

Direct

transition

interrupt

Interrupt

SLEEP

instruction

Interrupt

SLEEP

instruction

Interrupt

SLEEP

instruction

Figure 6.1 Mode Transition Diagram

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