91
Bit 6: STS2
Bit 5: STS1
Bit 4: STS0
Description
0
0
0
Wait time = 8,192 states
(initial value)
1
Wait time = 16,384 states
1
0
Wait time = 32,768 states
1
Wait time = 65,536 states
1
*
*
Wait time = 131,072 states
Note:
*
Don’t care
Bit 3—Low Speed on Flag (LSON): This bit chooses the system clock (ø) or subclock (ø
SUB
) as
the CPU operating clock when watch mode is cleared. The resulting operation mode depends on
the combination of other control bits and interrupt input.
Bit 3: LSON
Description
0
The CPU operates on the system clock (ø)
(initial value)
1
The CPU operates on the subclock (ø
SUB
)
Bits 2 to 0—Reserved Bits: These bits are reserved; they are always read as 1, and cannot be
modified.
System Control Register 2 (SYSCR2)
Bit
7
6
5
4
3
2
1
0
—
—
—
NESEL
DTON
MSON
SA1
SA0
Initial value
1
1
1
0
0
0
0
0
Read/Write
—
—
—
R/W
R/W
R/W
R/W
R/W
SYSCR2 is an 8-bit read/write register for power-down mode control.
Upon reset, SYSCR2 is initialized to H'E0.
Bits 7 to 5—Reserved Bits: These bits are reserved; they are always read as 1, and cannot be
modified.