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SA-1100 Developer’s Manual 9-15
System Control Module
9.2.1.4 Interrupt Controller Level Register (ICLR)
The interrupt controller level register (ICLR) controls whether a pending interrupt generates an
FIQ or an IRQ CPU interrupt. If a pending interrupt is unmasked, the corresponding ICLR bit field
is decoded to select which CPU interrupt should be asserted. If the interrupt is masked, then the
corresponding bit in the ICLR has no effect. The following table shows the location of all interrupt
level bits in the ICLR; question marks indicate that the values are unknown at reset.
Bit31302928272625242322212019181716
R/W IL31 IL30 IL29 IL28 IL27 IL26 IL25 IL24 IL23 IL22 IL21 IL20 IL19 IL18 IL17 IL16
Reset????????????????
Bit1514131211109876543210
R/W IL15 IL14 IL13 IL12 IL11 IL10 IL9 IL8 IL7 IL6 IL5 IL4 IL3 IL2 IL1 IL0
Reset????????????????
Bit Name Description
{n} IL{n}
Interrupt level n (where n = 0 through 31).
0 – Interrupt routed to CPU IRQ interrupt input.
1 – Interrupt routed to CPU FIQ interrupt input.