CHAPTER 13 STANDBY FUNCTION
Preliminary User’s Manual U16898EJ1V0UD
234
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the STOP mode is released. After the oscillation
stabilization time has elapsed, if interrupt acknowledgment is enabled, vectored interrupt servicing is
carried out. If interrupt acknowledgment is disabled, the next address instruction is executed.
Figure 13-5. STOP Mode Release by Interrupt Request Generation
(1) If CPU clock is high-speed Ring-OSC clock or external input clock
Operation
mode
Operation mode
Oscillation
STOP
instruction
STOP mode
Standby release
signal
System clock
oscillation
CPU status
Oscillation
Oscillation stops.
Operation
stops.
Interrupt
request
(8/f
RL
)
(2) If CPU clock is crystal/ceramic oscillation clock
Waiting for stabilization
of oscillation
Oscillation stabilization time
(set by OSTS)
(HALT mode status)
Operation
mode
Operation
mode
Oscillation
STOP
instruction
STOP mode
Standby release
signal
System clock
CPU status
Oscillation
Oscillation stops.
Operation
stops.
Interrupt
request
(8/f
RL
)
Remarks 1. The broken lines indicate the case when the interrupt request that has released the standby
mode is acknowledged.
2. f
RL
: Low-speed Ring-OSC clock oscillation frequency
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