258
Chapter 8
Clock Generator
User’s Manual U16580EE3V1UD00
(2)
Releasing HALT mode
The HALT mode is released by a non-maskable interrupt request signal (NMI), an unmasked
maskable interrupt request signal, or RESET pin input.
After the HALT mode has been released, the normal operation mode is restored.
(a) Releasing HALT mode by non-maskable interrupt request signal or unmasked
maskable interrupt request signal
The HALT mode is released by a non-maskable interrupt request signal (INTWDT) or an
unmasked maskable interrupt request signal, regardless of the priority of the interrupt request. If
the HALT mode is set in an interrupt servicing routine, however, an interrupt request that is issued
later is serviced as follows.
•
If an interrupt request signal with a priority lower than or same as the interrupt currently being
serviced is generated, the HALT mode is released, but the newly generated interrupt request
signal is not acknowledged. The interrupt request signal itself is retained.
•
If an interrupt request signal with a priority higher than that of the interrupt currently being
serviced is issued (including a non-maskable interrupt request signal), the HALT mode is
released and that interrupt request signal is acknowledged.
(b) Releasing HALT mode by RESET pin input or WDTRES signal generation
The same operation as the normal reset operation is performed.
Table 8-2:
Operation After Releasing HALT Mode by Interrupt Request Signal
Release Source
Interrupt Enabled (EI) Status
Interrupt Disabled (DI) Status
Non-maskable interrupt request
signal
Execution branches to the handler address
Unmasked maskable interrupt
request signal
Execution branches to the handler
address or the next instruction is
executed
The next instruction is executed
Содержание V850E/PH2
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