H8SSLASH2218 datasheet(657/750 Pages) RENESAS

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Section 20 Power-Down Modes

Rev.6.00 Jun. 03, 2008 Page 609 of 698

REJ09B0074-0600

Program-halted state

Program execution state

Reset execution state

SCK2 to

SCK0 = 0

SCK2 to

SCK0

≠ 0

SLEEP instruction

Any interrupt

SLEEP instruction

Interrupt *1

SLEEP instruction

Interrupt *2

Interrupt *1,

LSON bit = 1

STBY pin = High

RES pin = Low

STBY pin = Low

SSBY = 0, LSON = 0

SSBY = 1,

PSS = 0, LSON = 0

RES pin = High

MRES pin = High

: Transition after exception processing

Notes:

1. NMI and IRQ0 to IRQ4, IRQ7, RTC interrupt, and USB suspend/resume interrupt

2. NMI and IRQ0 to IRQ4, IRQ7, RTC interrupt, and WDT interrupt

: Power-down

Power-on

reset state

Manual

reset state

High-speed mode

(main clock)

Hardware

standby mode

Software

standby mode

Sleep mode

(main clock)

SSBY = 1,

PSS = 1, DTON = 0

SSBY = 0,

PSS = 1, LSON = 1

Sub-speed mode

(subclock)

Watch mode

(subclock)

Medium-speed

mode

(main clock)

SLEEP Instruction

SSBY = 1, PSS = 1,

DTON = 1, LSON = 0

After the oscillation

settling time (STS2 to 0),

clock switching exception

processing

SLEEP Instruction

SSBY = 1, PSS = 1,

DTON = 1, LSON = 1

Clock switching

exception processing

Sub-active

mode

(sub clock)

SLEEP instruction

Interrupt *1,

LSON bit = 0

When a transition is made between modes by means of an interrupt, the 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 power-on reset state occurs

when

RES is driven low. From any state except hardware standby mode and power-on reset, a

transition to the manual reset state occurs when

MRES is driven low.

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

STBY is driven low.

Always select high-speed mode before making a transition to watch mode or subactive mode.

Figure 20.1 Mode Transition Diagram

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