HD6413008VF25 Datasheet, PDF (133/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

5. Interrupt Controller
5.3 Interrupt Sources
The interrupt sources include external interrupts (NMI, IRQ₅ to IRQ₀) and 27 internal interrupts.
5.3.1 External Interrupts
There are seven external interrupts: NMI, and IRQ₅ to IRQ₀. Of these, NMI, IRQ₂, IRQ₁, and
IRQ₀ can be used to exit software standby mode.
NMI: NMI is the highest-priority interrupt and is always accepted, regardless of the states of the
I and UI bits in CCR. The NMIEG bit in SYSCR selects whether an interrupt is requested by the
rising or falling edge of the input at the NMI pin. NMI interrupt exception handling has vector
number 7.
IRQ₅
to
IRQ₀
Interrupts:
These
interrupts
are
requested
by
input
signals
at
pins
IRQ
5
to
IRQ₀.
The IRQ₅ to IRQ₀ interrupts have the following features.
• ISCR settings can select whether an interrupt is requested by the low level of the input at pins
IRQ
5
to
IRQ₀,
or
by
the
falling
edge.
• IER settings can enable or disable the IRQ₅ to IRQ₀ interrupts. Interrupt priority levels can be
assigned by four bits in IPRA (IPRA7 to IPRA4).
• The status of IRQ₅ to IRQ₀ interrupt requests is indicated in ISR. The ISR flags can be cleared
to 0 by software.
Figure 5.2 shows a block diagram of interrupts IRQ₅ to IRQ₀.
IRQnSC
IRQnE
IRQn input
Edge/level
sense circuit
IRQnF
S
Q
R
IRQn interrupt
request
Clear signal
Note: n = 5 to 0
Figure 5.2 Block Diagram of Interrupts IRQ₅ to IRQ₀
Rev.4.00 Aug. 20, 2007 Page 87 of 638
REJ09B0395-0400