H838024 datasheet(167/697 Pages) RENESAS

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Section 5 Power-Down Modes

Rev. 7.00 Mar 10, 2005 page 125 of 652

REJ09B0042-0700

Bit 4—Noise Elimination Sampling Frequency Select (NESEL)

This bit selects the frequency at which the watch clock signal (

W) generated by the subclock

pulse generator is sampled, in relation to the oscillator clock (

OSC) generated by the system clock

pulse generator. When

OSC = 2 to 20 MHz, clear NESEL to 0.

Bit 4

NESEL

Description

Sampling rate is

OSC/16

Sampling rate is

OSC/4

(initial value)

Bit 3—Direct Transfer on Flag (DTON)

This bit designates whether or not to make direct transitions among active (high-speed), active

(medium-speed) and subactive mode when a SLEEP instruction is executed. The mode to which

the transition is made after the SLEEP instruction is executed depends on a combination of other

control bits.

Bit 3

DTON

Description

• When a SLEEP instruction is executed in active mode,

(initial value)

a transition is made to standby mode, watch mode, or sleep mode

• When a SLEEP instruction is executed in subactive mode, a transition is made to

watch mode or subsleep mode

• When a SLEEP instruction is executed in active (high-speed) mode, a direct

transition is made to active (medium-speed) mode if SSBY = 0, MSON = 1, and

LSON = 0, or to subactive mode if SSBY = 1, TMA3 = 1, and LSON = 1

• When a SLEEP instruction is executed in active (medium-speed) mode, a direct

transition is made to active (high-speed) mode if SSBY = 0, MSON = 0, and

LSON = 0, or to subactive mode if SSBY = 1, TMA3 = 1, and LSON = 1

• When a SLEEP instruction is executed in subactive mode, a direct transition is

made to active (high-speed) mode if SSBY = 1, TMA3 = 1, LSON = 0, and MSON

= 0, or to active (medium-speed) mode if SSBY = 1, TMA3 = 1, LSON = 0, and

MSON = 1

Bit 2—Medium Speed on Flag (MSON)

After standby, watch, or sleep mode is cleared, this bit selects active (high-speed) or active

(medium-speed) mode.

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