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28.2
Mode Transitions and LSI States
Figure 28.1 shows the enabled 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 STBY input
causes a mode transition from any state to hardware standby mode. The RES input causes a mode
transition from a state other than hardware standby mode to the reset state. Table 28.2 shows the
LSI internal states in each operating mode.
Program execution state
SCK2 to
SCK0 are
0
Note: * 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.
Reset state
RES pin = High
High-speed mode
(main clock)
SCK2 to
SCK0 are
not 0
Medium-speed
mode
(main clock)
: Transition after exception handling
Figure 28.1 Mode Transition Diagram
STBY pin = High
RES pin = Low
SLEEP instruction
Any interrupt *
SLEEP
instruction
External
interrupt *
USB suspend/
resume interrupt
Rev. 1.00 Mar. 12, 2008 Page 1065 of 1178
Section 28 Power-Down Modes
Program halt state
STBY pin = Low
Hardware
standby mode
SSBY = 0
Sleep mode
(main clock)
SSBY = 1,
PSS = 0
Software
standby mode
: Power-down mode
REJ09B0403-0100
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