1. One feature of the 8051 core is the inclusion of a interrupt service routine . 2. Each and every entry of the IVT is the address of an interrupt service routine . 3. These pins generate interrupts to the controller, which then executes an interrupt service routine . 4. The copy will therefore continue from where it left off when the interrupt service routine returns control. 5. The value of the stack pointer can be checked at the start of the interrupt service routine . 6. For example, the Z80 / Z180 family disables interrupts once an interrupt is serviced by an interrupt service routine . 7. However, the Rabbit processors permit interrupts to interrupt service routines according to priorities ( a total of 4 ). 8. Internally, the 9S08 instruction set is upward compatible with the 6805, with the addition of Interrupt Service Routine ). 9. This helps reduce interrupt latency as the interrupt service routine can be executed directly without determining the source of the interrupt. 10. Instead, the interrupt service routine had to serially poll each active I / O device to see if it was the source.
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