Datasheet

Section 26 Power-Down Modes
Rev. 2.00 Sep. 28, 2009 Page 848 of 994
REJ09B0452-0200
26.2 Mode Transitions and LSI States
Figure 26.1 shows the possible mode transition diagram. The mode transition from program
execution state to program halt state is performed by the SLEEP instruction. The mode transition
from program halt state to program execution state is performed by an interrupt. The RES input
causes a mode transition from any state to the reset state. Table 26.3 shows the LSI internal states
in each operating mode.
Program halt state
Program execution state
SLEEP instruction
SLEEP instruction
Any interrupt
SLEEP
instruction
External interrupt*
2
Interrupt*
1
LSON bit = 0
RES pin = Low
SSBY = 0, LSON = 0
SSBY = 1,
PSS = 0, LSON = 0
SSBY = 1,
PSS = 1, DTON = 0
RES pin = High
: Transition after exception processing : Power-down mode
Reset state
High-speed
mode
(main clock)
Medium-speed
mode
Software
standby mode
Sleep mode
(main clock)
Watch mode
(subclock)
Notes: When a transition is made between modes by means of an interrupt, the transition cannot be made
on interrupt source generation alone. Ensure that interrupt handling is performed after accepting the
interrupt request.
1.
2.
NMI, IRQ0 to IRQ15, KIN0 to KIN15, WUE8 to WUE15, and WDT_1, PS2 and CIR interrupts
NMI, IRQ0 to IRQ15, KIN0 to KIN15, WUE8 to WUE15, and PS2 interrupts
SCK2 to
SCK0 = 0
SCK2 to
SCK0 ≠ 0
Figure 26.1 Mode Transition Diagram