CHAPTER 15 STANDBY FUNCTION
(2) Releasing STOP mode
The STOP mode can be released by the following two types of sources:
(a) Releasing by unmasked interrupt request
The STOP mode can be released by an unmasked interrupt request. In this case, if the interrupt is
enabled to be acknowledged, vectored interrupt processing is performed, after the oscillation
stabilization time has elapsed. If the interrupt is disabled, the instruction at the next address is
executed.
Figure 15-4. Releasing STOP Mode by Interrupt
Wait
STOP
instruction
(set time by OSTS)
Standby
release signal
Oscillation stabilization
Operation
mode
Operation
mode
wait status
STOP mode
Oscillation
stops
Oscillation
Oscillation
Clock
Remark The broken line indicates the case where the interrupt request that has released the standby mode is
acknowledged.
User’s Manual U15075EJ1V0UM00
285
NEC [ NEC ]
