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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
(1)
Release by interrupt request:
The SUB WATCH mode is released unconditionally by an unmasked maskable interrupt request
regardless of its priority level. After the main oscillator stabilization time has passed, CPU starts
operation. However, if the SUB WATCH mode is entered during execution of an interrupt handler,
the operation differs on interrupt priority levels as follows:
(a) If an interrupt request less priorities than the currently serviced interrupt request is generated,
the SUB WATCH mode is release but the interrupt is not acknowledged. The interrupt
request itself is retained.
(b) (If an interrupt request (including a non-maskable one) priorities than the currently serviced
interrupt request is generated, the interrupt request is acknowledged along with the SUB
WATCH mode release.
Table 9-10:
Operation after SUB WATCH mode release by interrupt request
Remark:
If SUB WATCH mode is entered during execution of a particular interrupt handler and an
unmasked interrupt request with a higher priority than the previous one is subsequently
generated, the program branches to the vector address for the later interrupt.
Release cause
EI state
DI state
NMI request
Branches to handler address.
Maskable interrupt
request
Branches to handler address, or
executes the next instruction.
Executes the next instruction.
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