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624
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 software 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
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the time the MCU
waits for the clock to stabilize when software standby mode, watch mode, or subactive mode is
cleared and a transition is made to high-speed mode or medium-speed mode by means of a
specific interrupt or instruction. With crystal oscillation, refer to table 23.4 and make a selection
according to the operating frequency so that the standby time is at least 8 ms (the oscillation
settling time). With an external clock, any selection can be made.
Bit 6
Bit 5
Bit 4
STS2
STS1
STS0
Description
0
Standby time = 8192 states
(Initial value)
1
Standby time = 16384 states
1
0
Standby time = 32768 states
1
Standby time = 65536 states
1
0
Standby time = 131072 states
1
Standby time = 262144 states
1
0
Reserved
1
Standby time = 16 states*
Note: Do not used this setting in the on-chip flash memory version.
Bit 3—Reserved: This bit cannot be modified and is always read as 0.