Sharp Blue Treak LH75400 User Manual

LH75400/01/10/11 (Preliminary) User’s Guide Vectored Interrupt Controller6/17/03 10-1710.2.2.9 Vector Address RegisterVectAddr is the Vector Address Register. This register contains the ISR address of the cur-rently active interrupt. Reading from this register provides the address of the ISR, and indi-cates to the priority hardware that the interrupt is being serviced. Writing to this registerindicates to the priority hardware that the interrupt has been serviced.The ISR reads the VectAddr Register:• When an IRQ interrupt is generated at the end of the ISR.• When the VectAddr Register is written to.• To update the priority hardware.Reading or writing to the register at other times can cause incorrect operation.Table 10-19. VectAddr RegisterBIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16FIELD VectorAddrRESET 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RWBIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0FIELD VectorAddrRESET 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RWADDR 0xFFFFF000 + 0x030Table 10-20. VectAddr Register DefinitionsBIT NAME DESCRIPTION31:0 VectorAddr ISR Address Contains the address of the currently active ISR. Any writesto this register clear the interrupt.