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User’s Manual U11969EJ3V0UM00
CHAPTER 6 CLOCK GENERATOR FUNCTION
(2)
Releasing IDLE mode
The IDLE mode is released by the NMI signal input or RESET signal input.
(a) Releasing by NMI signal input
The NMI request is accepted and serviced as soon as the IDLE mode has been released.
If the IDLE mode is entered in the NMI processing routine, however, only the IDLE mode is released, and
the interrupt will not be accepted. The interrupt request will be retained and kept pending.
The interrupt processing that is started by the NMI signal input when the IDLE mode is released is treated
in the same manner as a normal NMI interrupt that is processed (because there is only one vector address
of the NMI interrupt). Therefore, if it is necessary to distinguish between the two types of NMI interrupts,
a software flag should be defined in advance, and the flag must be set before setting the IDLE flag by
the store/bit manipulation instruction. By checking this flag during the NMI interrupt processing, the NMI
used to released the IDLE mode can be distinguished from the normal NMI.
(b) Releasing by RESET signal input
The same operation as the normal reset operation is performed.
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