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Power-Down State: In the power-down state, CPU operation halts and power consumption is
reduced. The power-down state is entered by executing a SLEEP instruction. There are two modes
in the power-down state: sleep mode and standby mode. For details, see section 9, Power-Down
Modes.
Bus-Released State: In this state the CPU has released the bus to a device that requested it.
Transitions between the states are shown in figure 2.6.
From any state when
= 0 and
Interrupt
Bus-released state
Bus request
From any state when
= 1
Power-on reset state
= 1,
Exception-handling state
Bus request
Bus request
clearance
Exception
interrupt
Bus request
Bus
clearance
request
Bus request
Program execution state
clearance
SLEEP instruction
with STBY bit
cleared
Sleep mode
Figure 2.6 Processor State Transitions
= 0 and
= 0,
= 1
= 1
End of exception
transition
processing
SLEEP instruction
with STBY bit set
= 0
Manual reset state
Reset state
= 1,
= 0
Standby mode
Power-down state
Rev. 4.0, 04/00, page 23 of 850
Interrupt
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