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An operation initialization reset (RST) is output to the internal circuitry.
The device enters the oscillation stabilization wait reset (RST) state as the set oscillation stabilization wait
time has passed.
When a setting initialization reset (INIT) request occurs, the device enters the setting initialization reset
(INIT) state.
●
Operation initialization reset (RST) state
This state is the program initialized state. The device enters the state either on receipt of an operation
initialization reset (RST) request or upon termination of the oscillation stabilization wait reset (RST) state.
The CPU stops program execution and the program counter is initialized. Most of the peripheral circuits
are initialized. All of the internal clocks, oscillator circuit, and the enabled main PLL are working.
An operation initialization reset (RST) is output to the internal circuitry.
When the operation initialization reset (RST) request is eliminated, the device enters the RUN state (normal
operating state) and executes the operation initialization reset sequence. When returning from the setting
initialization reset (INIT) state, the device executes the setting initialization reset sequence instead.
When a setting initialization reset (INIT) request occurs, the device enters the setting initialization reset
(INIT) state.
●
Setting initialization reset (INIT) state
This state is the state in which all settings are initialized. The device enters the state upon receipt of a
setting initialization reset (INIT) request.
The CPU stops program execution and the program counter is initialized. All of the peripheral circuits are
initialized. The oscillator circuit operates while the main PLL stops operation. All of the internal clocks
operate except when the external INIT pin maintains "L" level input.
A setting initialization reset (INIT) and an operation initialization reset (RST) are output to the internal
circuitry.
When the setting initialization reset (INIT) request is eliminated, the device is released from this state and
enters the oscillation stabilization wait reset (RST) state. The device then enters the operation initialization
reset (RST) state and executes the setting initialization reset sequence.
●
Priorities of state transition requests
State transition requests follow their priorities given as shown below regardless of the current state. Note,
however, that some requests are generated only under specific conditions; they are made valid only in such
conditions.
[Highest]
↓
↓
↓
↓
[Lowest]
Setting initialization reset (INIT) request
End of oscillation stabilization wait time (Occurs only in the oscillation
stabilization wait reset or oscillation stabilization wait RUN state.)
Operation initialization reset (RST) request
Valid interrupt request (Occurs only in the RUN, sleep, or stop state.)
Stop mode request (register write) (Occurs only in the RUN state.)
Sleep mode request (register write) (Occurs only in the RUN state.)
CHAPTER 3 CPU AND CONTROL UNITS
95
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