H8SSLASH2225 datasheet(878/1071 Pages) RENESAS

878 / 1071 page

Section 24 Power-Down Modes

Rev. 5.00 Aug 08, 2006 page 792 of 982

REJ09B0054-0500

24.3.2

Exiting Sleep Mode

Sleep mode is exited by any interrupt, or signals at the

RES pin, MRES pin, or STBY pin.

• Exiting Sleep Mode by Interrupts

When an interrupt occurs, sleep mode is exited and interrupt exception processing starts. Sleep

mode is not exited if the interrupt is disabled, or interrupts other than NMI are masked by the

CPU.

• Exiting Sleep Mode by RES Pin or MRES Pin

Setting the

RES pin or MRES pin level low selects the reset state. After the stipulated reset

input duration, driving the

RES pin or MRES pin high starts the CPU performing reset

exception processing.

• Exiting Sleep Mode by STBY Pin

When the

STBY pin level is driven low, a transition is made to hardware standby mode.

24.4

Software Standby Mode

24.4.1

Transition to Software Standby Mode

A transition is made to software standby mode when the SLEEP instruction is executed while the

SSBY bit in SBYCR = 1 and the LSON bit in LPWRCR = 0, and the PSS bit in TCSR_1

(WDT_1) = 0. In this mode, the CPU, on-chip peripheral modules, and system clock oscillator all

stop. However, the contents of the CPU’s internal registers, RAM data, and the states of on-chip

peripheral modules other than SCI and the A/D converter, and the states of I/O ports are retained.

In this mode the oscillator stops, and therefore power dissipation is significantly reduced.

24.4.2

Clearing Software Standby Mode

Software standby mode is cleared by an external interrupt (NMI pin, or pins

IRQ7 to IRQ0), or by

means of the

MRES pin or STBY pin.

• Clearing with an Interrupt

When an NMI, or IRQ7 to IRQ0 interrupt request signal is input, clock oscillation starts, and

after the elapse of the time set in bits STS2 to STS0 in SYSCR, stable clocks are supplied to

the entire this LSI chip, software standby mode is cleared, and interrupt exception handling is

started.

When clearing software standby mode with an IRQ7 to IRQ0 interrupt, set the corresponding

enable bit/pin function switching bit to 1 and ensure that no interrupt with a higher priority

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