Interrupts

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What happens? • So what happens when an interrupt (IRQ) occurs? 1/4/2010 30
What happens? • So what happens when an interrupt (IRQ) occurs? 1/4/2010 1. The high-to-low transition occurs on PD0 (INT0) 2. The current instruction in the program continues to execute, until it completes 3. Bit 0 in the EIFR (External Interrupt Flag Register) is set 4. The global interrupt bit in the status register is cleared (to disable any more interrupts) 5. The PC is pushed onto the stack 6. The PC is loaded with $0002 7. The AVR executes the instruction at $0002: the jump to the label EXT_INT0 so that execution of the interrupt handler can begin 31
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 and 18: Pins • Bits 7 - 4 External Interr
Page 19 and 20: Vectors The complete vector table i
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: An Example: Then we must write the
Page 33: Summary • In this topic we: - Bec

Interrupts

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