NXP Semiconductors LPC24XX UM10237 - Manual (Page 112)

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User manual Rev. 04 — 20 August 2009 112 of 792
NXP Semiconductors
UM10237
Chapter 7: LPC24XX Vectored Interrupt Controller (VIC)
[1] Reset Value reflects the data stored in used bits only. It does not include reserved bits content.
The following section describes the VIC registers in the order in which they are used in the
VIC logic, from those closest to the interrupt request inputs to those most abstracted for
use by software. For most people, this is also the best order to read about the registers
when learning the VIC.
3.1 Software Interrupt Register (VICSoftInt - 0xFFFF F018)
The VICSoftInt register is used to generate software interrupts. The contents of this
register are ORed with the 32 interrupt requests from the various peripherals, before any
other logic is applied.
3.2 Software Interrupt Clear Register (VICSoftIntClear - 0xFFFF F01C)
The VICSoftIntClear register is a ’Write Only’ register. This register allows software to
clear one or more bits in the Software Interrupt register, without having to first read it.
3.3 Raw Interrupt Status Register (VICRawIntr - 0xFFFF F008)
This is a read only register. This register reads out the state of the 32 interrupt requests
and software interrupts, regardless of enabling or classification.
VICVectPriority26 Vector priority 26 register. R/W 0xF 0xFFFF F268
VICVectPriority27 Vector priority 27 register. R/W 0xF 0xFFFF F26C
VICVectPriority28 Vector priority 28 register. R/W 0xF 0xFFFF F270
VICVectPriority29 Vector priority 29 register. R/W 0xF 0xFFFF F274
VICVectPriority30 Vector priority 30 register. R/W 0xF 0xFFFF F278
VICVectPriority31 Vector priority 31 register. R/W 0xF 0xFFFF F27C
VICAddress Vector address register. When an IRQ interrupt occurs, the
Vector Address Register holds the address of the currently
active interrupt. R/W 0 0xFFFF FF00
Table 102. Summary of VIC registers
Name Description Access Reset
value
[1]
Address
Table 103. Software Interrupt register (VICSoftInt - address 0xFFFF F018) bit description
Bit Symbol Value Description Reset
value
31:0 See Table 7–117
“Interrupt sources
bit allocation
table”
.
0 Do not force the interrupt request with this bit number. Writing zeroes to bits
in VICSoftInt has no effect, see VICSoftIntClear (
Section 7–3.2 ).
0
1 Force the interrupt request with this bit number.
Table 104. Software Interrupt Clear register (VICSoftIntClear - address 0xFFFF F01C) bit description
Bit Symbol Value Description Reset
value
31:0 See Table 7–117
“Interrupt sources
bit allocation table”
.
0 Writing a 0 leaves the corresponding bit in VICSoftInt unchanged. 0
1 Writing a 1 clears the corresponding bit in the Software Interrupt register,
removing any interrupt that may have been generated by that bit.