HD64F2149YV datasheet(777/1075 Pages) RENESAS

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Section 24 Power-Down State

Rev. 3.00 Jan 18, 2006 page 749 of 1044

REJ09B0280-0300

Hardware

standby mode

STBY pin = low

Notes: • When a transition is made between modes by means of an interrupt, transition cannot be made

on interrupt source generation alone. Ensure that interrupt handling is performed after accepting

the interrupt request.

• From any state except hardware standby mode, a transition to the reset state occurs whenever

RES goes low.

• From any state, a transition to hardware standby mode occurs when

STBY goes low.

• When a transition is made to watch mode or subactive mode, high-speed mode must be set.

Sleep mode

(main clock)

SSBY = 0, LSON = 0

Software

standby mode

SSBY = 1

PSS = 0, LSON = 0

Watch mode

(subclock)

SSBY = 1

PSS = 1, DTON = 0

Subsleep mode

(subclock)

SSBY = 0

PSS = 1, LSON = 1

Medium-speed

mode

(main clock)

Subactive mode

(subclock)

High-speed

mode

(main clock)

Reset state

STBY pin = high

RES pin = low

RES pin = high

Program execution state

SLEEP instruction

SSBY = 1, PSS = 1,

DTON = 1, LSON = 0

Clock switching

exception handling

after oscillation

setting time

(STS2 to STS0)

SLEEP instruction

SSBY = 1, PSS = 1,

DTON = 1, LSON = 1

Clock switching

exception handling

SCK2 to

SCK0

≠ 0

SCK2 to

SCK0

= 0

Program-halted state

SLEEP

instruction

Any interrupt*3

SLEEP

instruction

External

interrupt*4

SLEEP

instruction

Interrupt*1,

LSON bit = 0

SLEEP

instruction

Interrupt*1,

LSON bit = 1

Interrupt*2

SLEEP instruction

: Transition after exception handling

: Power-down mode

1. NMI, IRQ0 to IRQ2, IRQ6, IRQ7, and WDT1 interrupts

2. NMI, IRQ0 to IRQ7, and WDT0 interrupts, WDT1 interrupt, TMR0 interrupt, TMR1 interrupt

3. All interrupts

4. NMI, IRQ0 to IRQ2, IRQ6, IRQ7

Figure 24.1 Mode Transitions

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