Philips LPC2119 User Manual page 82

Philips Semiconductors
ARM-based Microcontroller
Vector Address Register (VICVectAddr - 0xFFFFF030, Read/Write)
When an IRQ interrupt occurs, the IRQ service routine can read this register and jump to the value read.
Table 52: Vector Address Register (VICVectAddr - 0xFFFFF030, Read/Write)
VICVectAddr
If any of the interrupt requests or software interrupts that are assigned to a vectored IRQ slot
is (are) enabled, classified as IRQ, and asserted, reading from this register returns the
address in the Vector Address Register for the highest-priority such slot (lowest-numbered)
31:0 such slot. Otherwise it returns the address in the Default Vector Address Register.
Writing to this register does not set the value for future reads from it. Rather, this register
should be written near the end of an ISR, to update the priority hardware.
Protection Enable Register (VICProtection - 0xFFFFF020, Read/Write)
This one-bit register controls access to the VIC registers by software running in User mode.
Table 53: Protection Enable Register (VICProtection - 0xFFFFF020, Read/Write)
VICProtection
1: the VIC registers can only be accessed in privileged mode.
0
0: VIC registers can be accessed in User or privileged mode.
Vectored Interrupt Controller (VIC)
Function
Function
82
Preliminary User Manual
LPC2119/2129/2292/2294
Reset Value
Reset Value
January 08, 2004
0
0