CHAPTER 14 STANDBY FUNCTION
Preliminary User’s Manual U19014EJ1V0UD
419
(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 14-6. STOP Mode Release by Interrupt Request Generation
(1) When high-speed system clock is used as CPU clock
Operating mode
(high-speed
system clock)
Operating mode
(high-speed
system clock)
Oscillates
Oscillates
STOP
instruction
STOP mode
Wait
(set by OSTS)
Standby release signal
Oscillation stabilization wait
(HALT mode status)
Oscillation stopped
High-speed
system clock
(X1 oscillation)
Status of CPU
Oscillation stabilization time (set by OSTS)
(2) When internal high-speed oscillation clock is used as CPU clock
Normal operation
(internal high-speed
oscillation clock)
Normal operation
(internal high-speed
oscillation clock)
Oscillates
STOP
instruction
STOP mode
Standby release signal
Internal high-speed
oscillation clock
Status of CPU
Oscillation stopped
Oscillates
Wait for oscillation
accuracy
stabilization
Remark
The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.
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