Renesas SH7781 - Manual (Page 313)

10. Interrupt Controller (INTC)
Rev.1.00 Jan. 10, 2008 Page 283 of 1658
REJ09B0261-0100
(4) Interrupt Source Register (INTREQ)
INTREQ is a 32-bit readable and conditionally writable register that indicates which of the IRQ
[n] (n = 0 to 7) interrupts is currently asserting a request for the INTC.
Even if an interrupt is masked by the setting in INTPRI or INTMSK0, operation of the
corresponding INTREQ bit is not affected.
16 17 18 19 20 21 22 23 24 25 26 27 28 29 31 30
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ IR7 IR6 IR5 IR4 IR3 IR2 IR0 IR1
R R R R R R R R R/(W) R/(W) R/(W) R/(W) R/(W) R/(W) R/(W) R/(W)
Bit:
Initial value:
R/W:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 15 14
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯
R R R R R R R R R R R R R R R R
Bit:
Initial value:
R/W:
Description
Bit Name
Initial
Value R/W Edge Detection
(IRQnS = 00 or 01)
* 1
Level Detection
(IRQnS = 10 or 11)
* 1
31 IR0 0 R/(W)
30 IR1 0 R/(W)
29 IR2 0 R/(W)
28 IR3 0 R/(W)
27 IR4 0 R/(W)
26 IR5 0 R/(W)
25 IR6 0 R/(W)
24 IR7 0 R/(W)
[When read]
0: The corresponding IRQ
interrupt request has not
been detected.
1: The corresponding IRQ
interrupt request has been
detected.
[When written] * 2
When clearing each bit, write a
0 after having read a 1 from it.
Writing 1 to the bit is ignored.
[When read]
(ICR0.LVLMODE = 0)
0: The corresponding interrupt
source has not been
detected.
1: The corresponding interrupt
source has been detected.
[When read]
(ICR0.LVLMODE = 1)
0: The corresponding IRQ
interrupt pin is not asserted.
1: The corresponding IRQ
interrupt pin is asserted, but
the CPU has not accepted
the interrupt request yet.
Writing have no effect. * 3
23 to 0
⎯ All
0 R Reserved
These bits are always read as 0. The write value should always
be 0.
Notes: 1. n = 0 to 7
2. Write 1 to the bit if it should not be cleared yet.
3. For the method of clearing the IRQ interrupt request that has been detected by level
sensing, refer to section 10.7.3, Clearing IRQ and IRL Interrupt Requests.