HD64F36022 datasheet(99/384 Pages) RENESAS

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Section 6 Power-Down Modes

Rev. 4.00 Sep. 23, 2005 Page 73 of 354

REJ09B0025-0400

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 of the program by executing a SLEEP

instruction. Interrupts allow for returning from the program halt state to the program execution

state of the program. A direct transition from active mode to active mode changes the operating

frequency.

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

Program halt state

Program execution state

Program halt state

SLEEP

instruction

SLEEP

instruction

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.

Interrupt

SLEEP

instruction

Interrupt

Figure 6.1 Mode Transition Diagram

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