Hitachi H8/3637 Hardware Manual page 101

Bit 4— Noise Elimination Sampling Frequency Select (NESEL): This bit selects the frequency
at which the watch clock signal (ø
relation to the oscillator clock (ø
to 10 MHz, clear NESEL to 0.
Bit 4: NESEL
0
1
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 this and other control bits.
Bit 3: DTON
0
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.
Bit 2: MSON
0
1
92
) generated by the subclock pulse generator is sampled, in
W
) generated by the system clock pulse generator. When ø
OSC
Description
Sampling rate is ø
OSC
Sampling rate is ø
OSC
Description
•
When a SLEEP instruction is executed in active mode, 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.
Description
Operation is in active (high-speed) mode
Operation is in active (medium-speed) mode
/16
/4
= 2
OSC
(initial value)
(initial value)
(initial value)