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 (φ
W
) generated by the subclock
pulse generator is sampled, in relation to the oscillator clock (φ
OSC
) generated by the system clock
pulse generator. When φ
OSC
= 2 to 20 MHz, clear NESEL to 0.
Bit 4
NESEL Description
0 Sampling rate is φ
OSC
/16
1 Sampling rate is φ
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
0
• 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
1
• 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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