Renesas SH7781 - Manual (Page 295)

10. Interrupt Controller (INTC)
Rev.1.00 Jan. 10, 2008 Page 265 of 1658
REJ09B0261-0100
The details of the input control circuit of figure 10.1 are shown in figure 10.2.
NMI
IRQ/ IRL7 to
IRQ/ IRL0
NMI
detector* 4
Input control NMI interrupt
request
INTC
IRL
mask
controller
Noise
canceller
Noise
canceller
for level
detection
IRL
detector* 2
Priority
determination
for external
interrupts
IRQ
detector* 3
IRL/IRQ
pin mode
controller* 1
ICR0
ICR1
INTMSK2
INTREQ
INTMSK1
INTMSK0
IRL
IRQ
Notes: 1. The internal signal for IRQ is fixed when ICR0.IRLMn (n = 0, 1) is cleared to 0, and the
internal signal for IRL is fixed when ICR0.IRLMn is set to 1 to prevent propagation of the state
transition on the pin to inside the LSI.
2. IRL detector includes a noise canceller.
When the interrupt source holding mode bit (ICR0.LVLMODE) is cleared to 0, the interrupt
source bits for the detected IRL interrupt request are retained in the INTC. When
ICR0.LVLMODE = 1, the interrupt source bits are not retained.
In the case of ICR0.LVLMODE = 0, if the IRL interrupt request masking is set by INTMSK2
after the interrupt source bit is retained, the IRL interrupt request of the source that has
already been retained will not be masked. To clear the retained interrupt request, refer to
section 10.7.1.
3. When the IRQ interrupt is configured for level-sense, the interrupt source bit of the IRQ
interrupt detected by this circuit is retained if ICR0.LVLMODE = 0. The interrupt source bits of
the level-sense IRQ are not retained if ICR0.LVLMODE = 1.
4. This circuit detects the NMI interrupt request.
Figure 10.2 Input Control Circuit for the Interrupt Requested from the External Pin