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HD64F38024HV Datasheet, PDF (149/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series | |||
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Section 5 Power-Down Modes
Bit 4âNoise Elimination Sampling Frequency Select (NESEL)
This bit selects the frequency at which the watch clock signal (ÏW) generated by the subclock
pulse generator is sampled, in relation to the oscillator clock (ÏOSC) generated by the system clock
pulse generator. When ÏOSC = 2 to 20 MHz, clear NESEL to 0.
Bit 4
NESEL
0
1
Description
Sampling rate is ÏOSC/16
Sampling rate is ÏOSC/4
(initial value)
Bit 3âDirect 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
0
1
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 2âMedium Speed on Flag (MSON)
After standby, watch, or sleep mode is cleared, this bit selects active (high-speed) or active
(medium-speed) mode.
Rev. 8.00 Mar. 09, 2010 Page 127 of 658
REJ09B0042-0800
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