Rev. 1.0, 02/00, page 175 of 1141
9.2.2
Low-Power Control Register (LPWRCR)
7
DTON
0
R/W
6
LSON
0
R/W
5
NESEL
0
R/W
4
—
0
—
3
—
0
—
0
SA0
0
R/W
2
—
0
—
1
SA1
0
R/W
Bit
Initial value
R/W
:
:
:
LPWRCR is an 8-bit readable/writable register that performs power-down mode control.
Only bit 1 and 0 is described here. For a description of the other bits, see section 4.2.2, Low-
Power Control Register (LPWRCR).
LPWRCR is initialized to H'00 by a reset.
Bits 1 and 0
Subactive Mode Clock Select (SA1, SA0): Selects CPU clock for subactive mode.
In subactive mode, writes are disabled.
Bit 1
Bit 0
SA1
SA0
Description
0
CPU operating clock is
φ
w/8
(Initial value)
0
1
CPU operating clock is
φ
w/4
1
*
CPU operating clock is
φ
w/2
Note:
*
Don't care