NXP Semiconductors LPC24XX UM10237 - Manual (Page 114)

UM10237_4 © NXP B.V. 2009. All rights reserved.
User manual Rev. 04 — 20 August 2009 114 of 792
NXP Semiconductors
UM10237
Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
3.7 IRQ Status Register (VICIRQStatus - 0xFFFF F000)
This is a read only register. This register reads out the state of those interrupt requests
that are enabled and classified as IRQ.
3.8 FIQ Status Register (VICFIQStatus - 0xFFFF F004)
This is a read only register. This register reads out the state of those interrupt requests
that are enabled and classified as FIQ. If more than one request is classified as FIQ, the
FIQ service routine can read this register to see which request(s) is (are) active.
3.9 Vector Address Registers 0-31 (VICVectAddr0-31 - 0xFFFF F100 to
17C)
These are read/write accessible registers. These registers hold the addresses of the
Interrupt Service routines (ISRs) for the 32 vectored IRQ slots.
Table 108. Interrupt Select register (VICIntSelect - address 0xFFFF F00C) bit description
Bit Symbol Value Description Reset
value
31:0 See Table
7–117
“Interrupt
sources bit
allocation
table”
.
0 The interrupt request with this bit number is assigned to the
IRQ category. 0
1 The interrupt request with this bit number is assigned to the
FIQ category.
Table 109. IRQ Status register (VICIRQStatus - address 0xFFFF F000) bit description
Bit Symbol Description Reset
value
31:0 See Table
7–117
“Interrupt
sources bit
allocation
table”
.
A bit read as 1 indicates a corresponding interrupt request being
enabled, classified as IRQ, and asserted 0
Table 110. FIQ Status register (VICFIQStatus - address 0xFFFF F004) bit description
Bit Symbol Description Reset
value
31:0 See Table
7–117
“Interrupt
sources bit
allocation
table”
.
A bit read as 1 indicates a corresponding interrupt request being
enabled, classified as IRQ, and asserted 0