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(2) Releasing HALT mode
The HALT mode can be released by the non-maskable interrupt request, an unmasked maskable interrupt
request, or a RESET signal input.
(a) Releasing by interrupt request
The HALT mode is unconditionally released by the NMI request or an unmasked maskable interrupt
request, regardless of the priority. However, if the HALT mode is set in an interrupt processing routine,
the operation will differ as follows:
(i)
If an interrupt request with a priority lower than that of the interrupt request under execution is
generated, the HALT mode is released, but the newly generated interrupt request is not accepted.
The new interrupt request will be kept pending.
(ii) If an interrupt request with a priority higher (including NMI request) than the interrupt request under
execution is generated, the HALT mode is released, and the interrupt request is also accepted.
Operation after HALT mode has been released by interrupt request
Releasing Source
NMI request
Maskable interrupt request
(b) Releasing by RESET signal input
The same operation as the normal reset operation is performed.
144
CHAPTER 6 CLOCK GENERATOR FUNCTION
Interrupt Enable (EI) Status
Branches to handler address
Branches to handler address Executes next instruction
or executes next instruction
User's Manual U11969EJ3V0UM00
Interrupt disable (DI) Status
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