61
3.3
Interrupts
3.3.1
Overview
The interrupt sources that initiate interrupt exception handling comprise 12 external interrupts
(WKP
7
to WKP
0
, IRQ
4
to IRQ
1
), 23 internal interrupts from on-chip peripheral modules, and one
internal IRQ
0
interrupt. Table 3-2 shows the interrupt sources, their priorities, and their vector
addresses. When more than one interrupt is requested, the interrupt with the highest priority is
processed.
The interrupts have the following features:
•
Internal and external interrupts can be masked by the I bit in CCR. When the I bit is set to 1,
interrupt request flags can be set but the interrupts are not accepted.
•
IRQ
4
to IRQ
0
and WKP
7
to WKP
0
can be set to either rising edge sensing or falling edge
sensing.
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