Interrupts

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Vectors The complete vector table is shown on page 60 of the “Complete ATmega128 Manual” When an interrupt occurs the hardware clears the corresponding interrupt flag and the Program Counter is “vectored” to the actual interrupt vector in order to execute the interrupt handling routine. 1/4/2010 18
Vectors The complete vector table is shown on page 60 of the “Complete ATmega128 Manual” When an interrupt occurs the hardware clears the corresponding interrupt flag and the Program Counter is “vectored” to the actual interrupt vector in order to execute the interrupt handling routine. 1/4/2010 This is very different from other processors. In most microcontrollers, the interrupt vector HOLDS THE ADDRESS OF THE 1 ST INSTRUCTION OF THE ISR (OR INTERRUPT HANDLER) not an instruction to jump to it 19
Page 1 and 2: Microprocessor Fundamentals Topic 1
Page 3 and 4: Interrupts • Interrupts are async
Page 5 and 6: Maskable/Non-maskable • Interrupt
Page 7 and 8: EICRA INT3 - 0 • External Interru
Page 9 and 10: EICRA INT3 - 0 1/4/2010 Exercise: W
Page 11 and 12: Pins • INT3:0 External Interrupts
Page 13 and 14: Pins • INT3:0 When the appropriat
Page 15 and 16: Pins • INT3:0 Exercise: I want to
Page 17: Pins • Bits 7 - 4 External Interr
Page 21 and 22: An Example: • So, let’s work th
Page 23 and 24: An Example: We must start our progr
Page 25 and 26: An Example: We need to write the in
Page 27 and 28: An Example: We must start our progr
Page 29 and 30: An Example: Then we must write the
Page 31 and 32: What happens? • So what happens w
Page 33: Summary • In this topic we: - Bec

Interrupts

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