Rev. 1.0, 02/00, page 72 of 1141
4.2
Register Descriptions
4.2.1
Standby Control Register (SBYCR)
0
0
1
0
R/W
2
0
3
—
—
—
—
0
4
0
R/W
5
0
6
0
7
R/W
R/W
STS1
R/W
STS2
0
R/W
SSBY
STS0
SCK1
SCK0
Bit :
Initial value :
R/W :
SBYCR is an 8-bit readable/writable register that performs power-down mode control.
SBYCR is initialized to H'00 by a reset.
Bit 7
Software Standby (SSBY): Determines the operating mode, in combination with other
control bits, when a power-down mode transition is made by executing a SLEEP instruction. The
SSBY setting is not changed by a mode transition due to an interrupt, etc.
Bit 7
SSBY
Description
0
Transition to sleep mode after execution of SLEEP instruction in high-speed mode
or medium-speed mode
Transition to subsleep mode after execution of SLEEP instruction in subactive
mode
(Initial value)
1
Transition to standby mode, subactive mode, or watch mode after execution of
SLEEP instruction in high-speed mode or medium-speed mode
Transition to watch mode or high-speed mode after execution of SLEEP instruction
in subactive mode