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Reset state
Reset
occurs
Program halt state
2.7.2 Program Execution State
In the program execution state the CPU executes program instructions in sequence.
There are three modes in this state, two active modes (high speed and medium speed) and one
subactive mode. Operation is synchronized with the system clock in active mode (high speed and
medium speed), and with the subclock in subactive mode. See section 5, Power-Down Modes for
details on these modes.
2.7.3 Program Halt State
In the program halt state there are five modes: two sleep modes (high speed and medium speed),
standby mode, watch mode, and subsleep mode. See section 5, Power-Down Modes for details on
these modes.
2.7.4 Exception-Handling State
The exception-handling state is a transient state occurring when exception handling is started by a
reset or interrupt and the CPU changes its normal processing flow. In exception handling caused by
an interrupt, SP (R7) is referenced and the PC and CCR values are saved on the stack.
For details on interrupt handling, see section 3.3, Interrupts.
Reset cleared
Reset occurs
Reset
occurs
SLEEP instruction executed
Figure 2-15 State Transitions
46
Exception-handling state
Interrupt
source
Interrupt
occurs
source
occurs
Program execution state
Exception-
handling
complete
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