Datasheet

Section 5 Interrupt Controller
Page 110 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
A block diagram of the interrupt controller is shown in figure 5.1.
INTCR
NMI input
IRQ input
Internal
interrupt
sources
SWDTEND
to SSTXI
INTM1 INTM0
NMIEG
NMI input unit
IRQ input unit
ISR
ISCRITSR 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 5.1 Block Diagram of Interrupt Controller