H8SLASH3008 datasheet(102/686 Pages) RENESAS

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3. MCU Operating Modes

Rev.4.00 Aug. 20, 2007 Page 58 of 638

REJ09B0395-0400

Bit 7—Software Standby (SSBY): Enables transition to software standby mode. (For further

information about software standby mode see section 18, Power-Down State.)

When software standby mode is exited by an external interrupt, and a transition is made to normal

operation, this bit remains set to 1. To clear this bit, write 0.

Bit 7

SSBY

Description

SLEEP instruction causes transition to sleep mode

(Initial value)

SLEEP instruction causes transition to software standby mode

Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the length of time

the CPU and on-chip supporting modules wait for the internal clock oscillator to settle when

software standby mode is exited by an external interrupt.

When using a crystal oscillator, set these bits so that the waiting time will be at least 7 ms at the

system clock rate.

For further information about waiting time selection, see section 18.4.3, Selection of Waiting

Time for Exit from Software Standby Mode.

Bit 6

STS2

Bit 5

STS1

Bit 4

STS0

Description

Waiting time = 8,192 states

(Initial value)

Waiting time = 16,384 states

Waiting time = 32,768 states

Waiting time = 65,536 states

Waiting time = 131,072 states

Waiting time = 262,144 states

Waiting time = 1,024 states

Illegal setting

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