368
SYSCR2—System control register 2
H'F1
System control
Bit
Initial value
Read/Write
7
—
1
—
6
—
1
—
5
—
1
—
3
DTON
0
R/W
0
SA0
0
R/W
2
MSON
0
R/W
1
SA1
0
R/W
4
NESEL
0
R/W
Direct transfer on flag
0
When a SLEEP instruction is executed in active mode, a transition is
made to standby mode, watch mode, or sleep mode.
1
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.
Subactive mode clock select
0
ø /8
ø /4
0
1
1
ø /2
*
W
W
W
Noise elimination sampling frequency select
0
Sampling rate is ø /16
1
Sampling rate is ø /4
OSC
OSC
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.
Medium speed on flag
0
Operates in active (high-speed) mode
1
Operates in active (medium-speed) mode
Note: Don’t care
*