Block Diagram - Hitachi H8S/2678 Series Reference Manual

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
Interrupt controller
Legend
ISCR:
IER:
ISR:
IPR:
INTCR: Interrupt control register
ITSR:
INTM1 INTM0
NMIEG
NMI input unit
IRQ input unit
ISR
ITSR ISCR IER
IRQ sense control register
IRQ enable register
IRQ status register
Interrupt priority register
IRQ pin select register
Figure 3.1 Block Diagram of Interrupt Controller
Priority
determination
IPR
CPU
Interrupt
request
Vector
number
I
CCR
I2 to I0
EXR
55