Rabbit 2000, User Manual

Page: 90 / 230

84 Rabbit 2000 Microprocessor
7.9 Rabbit Interrupt Structure
An interrupt causes a call to be executed, pushing the PC on the stack and starting to exe-
cute code at the interrupt vector address. The interrupt vector addresses have a fixed lower
byte value for all interrupts. The upper byte is adjustable by setting the registers EIR and
IIR for external and internal interrupts respectively. There are only two external interrupts
generated by transitions on certain pins in parallel port E.
The interrupt vectors are shown in Table 7-11.
Table 7-11. Peripheral Device Address and Interrupt Vectors
On-Chip Peripheral ISR Starting Address
System Management (periodic interrupt) {IIR, 0x00}
Memory Management No interrupts
Slave Port {IIR, 0x80}
Parallel Port A No interrupts
Parallel Port B No interrupts
Parallel Port C No interrupts
Parallel Port D No interrupts
Parallel Port E No interrupts
External I/O Control No interrupts
External Interrupts
INT0 {EIR, 0x00}
INT1 {EIR, 0x10}
Timer A {IIR, 0xA0}
Timer B {IIR, 0xB0}
Serial Port A {IIR, 0xC0}
Serial Port B {IIR, 0xD0}
Serial Port C {IIR, 0xE0}
Serial Port D {IIR, 0xF0}
RST 10 instruction {IIR, 0x20}
RST 18 instruction {IIR, 0x30}
RST 20 instruction {IIR, 0x40}
RST 28 instruction {IIR, 0x50}
RST 38 instruction {IIR, 0x70}