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5.3
Interrupt Sources
The interrupt sources include external interrupts (NMI, IRQ
5.3.1
External Interrupts
There are seven external interrupts: NMI, and IRQ
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.
Note: In the flash memory and flash memory R versions, NMI input is sometimes disabled. For
details see 18.6.4, NMI Input Disable Conditions.
Interrupts: These interrupts are requested by input signals at pins IRQ
IRQ
to IRQ
0
5
The IRQ
to IRQ
interrupts have the following features.
0
5
• ISCR settings can select whether an interrupt is requested by the low level of the input at pins
IRQ
to IRQ
, or by the falling edge.
0
5
• IER settings can enable or disable the IRQ
assigned by four bits in IPRA (IPRA7 to IPRA4).
• The status of IRQ
to 0 by software.
Figure 5.2 shows a block diagram of interrupts IRQ
IRQn
input
Note: n = 5 to 0
Figure 5.2 Block Diagram of Interrupts IRQ
to IRQ
interrupt requests is indicated in ISR. The ISR flags can be cleared
0
5
IRQnSC
Edge/level
sense circuit
to IRQ
0
to IRQ
. Of these, NMI, IRQ
0
5
to IRQ
interrupts. Interrupt priority levels can be
0
5
to IRQ
.
0
5
IRQnF
S
Q
R
Clear signal
Rev. 4.00 Jan 26, 2006 page 105 of 938
Section 5 Interrupt Controller
) and 36 internal interrupts.
5
, IRQ
, and IRQ
0
1
to IRQ
0
IRQnE
IRQn interrupt
request
to IRQ
0
5
REJ09B0276-0400
2
.
5
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