438
SYSCR1—System control register 1
H'F0
System control
Bit
Initial value
Read/Write
7
SSBY
0
R/W
6
STS2
0
R/W
5
STS1
0
R/W
3
LSON
0
R/W
0
MA0
1
R/W
2
—
1
—
1
MA1
1
R/W
4
STS0
0
R/W
Software standby
0 • When a SLEEP instruction is executed in active mode, a transition is
made to sleep mode
1
Standby timer select 2 to 0
0
Wait time = 8,192 states
Wait time = 16,384 states
0 0
1
Wait time = 32,768 states
Wait time = 65,536 states
1 0
1
Active (medium-speed)
mode clock select
ø /16
ø /32
0
1
0
0
1
1
ø /64
ø /128
1
1
0 0
1 0
1
Wait time = 131,072 states
Wait time = 2 states
Wait time = 8 states
Wait time = 16 states
Low speed on flag
0
The CPU operates on the system clock (ø)
1
The CPU operates on the subclock (ø )
SUB
• When a SLEEP instruction is executed in subactive mode, a transition
is made to subsleep mode
• When a SLEEP instruction is executed in active mode, a transition is
made to standby mode or watch mode
• When a SLEEP instruction is executed in subactive mode, a transition
is made to watch mode
osc
osc
osc
osc