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5. Power-Down Modes
5.1.1
System Control Registers
The operation mode is selected using the system control registers described in table 5.3.
Table 5.3
System Control Register
Name
System control register 1
System control register 2
System Control Register 1 (SYSCR1)
Bit
SSBY
Initial value
Read/Write
R/W
SYSCR1 is an 8-bit read/write register for control of the power-down modes.
Bit 7—Software Standby (SSBY): This bit designates transition to standby mode or watch mode.
Bit 7: SSBY
Description
•
0
•
•
1
•
Rev.3.00 Jul. 19, 2007 page 104 of 532
REJ09B0397-0300
Abbreviation
SYSCR1
SYSCR2
7
6
5
STS2
STS1
0
0
0
R/W
R/W
When a SLEEP instruction is executed in active mode, a transition is made
to sleep mode
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.
R/W
Initial Value
R/W
H'07
R/W
H'E0
4
3
STS0
LSON
0
0
R/W
R/W
Address
H'FFF0
H'FFF1
2
1
0
⎯
⎯
⎯
1
1
1
⎯
⎯
⎯
(initial value)
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