55
3.2.2
Block Diagram
Figure 3.1 shows a block diagram of the interrupt controller.
INTCR
NMI input
IRQ input
Internal
interrupt
sources
SWDTEND
to TEI
INTM1 INTM0
NMIEG
NMI input unit
IRQ input unit
ISR
ISCR
ITSR
IER
IPR
Interrupt controller
Priority
determination
Interrupt
request
Vector
number
I
I2 to I0
CCR
EXR
CPU
Legend
ISCR:
IRQ sense control register
IER:
IRQ enable register
ISR:
IRQ status register
IPR:
Interrupt priority register
INTCR: Interrupt control register
ITSR:
IRQ pin select register
Figure 3.1 Block Diagram of Interrupt Controller
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