NEC PD78F9488 User Manual
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CHAPTER 17 STANDBY FUNCTION
User’s Manual U15331EJ4V1UD
313
(2) Releasing STOP mode
The STOP mode can be released by the following two sources.
(a) Release by unmasked interrupt request
The STOP mode can be released by an unmasked interrupt request. In this case, if interrupts are
enabled to be acknowledged, vectored interrupt servicing is performed, after the oscillation stabilization
time has elapsed. If interrupts are disabled, the instruction at the next address is executed.
Figure 17-4. Releasing STOP Mode by Interrupt
STOP
instruction
Standby
release signal
Wait
(set time by OSTS)
STOP mode
Operation
mode
Oscillation stabilization
wait status
Clock
Operation
mode
Oscillation
stops
Oscillation
Oscillation
Remark The broken lines indicate the case where the interrupt request that released the standby mode is
acknowledged.