Interrupts

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Objectives • To become familiar with interrupts on the AVR – Maskable and non-maskable – Initialization – Triggers • To develop interrupt service routines (ISRs) to handle interrupts • To understand the sequence of events that occur when an IRQ occurs 1/4/2010 2
Interrupts • Interrupts are asynchronous changes in program flow that occur as a result of events outside the running program – They are usually hardware related: • Examples: button press, timer expiration, peripheral device needs data, etc – Interrupt conditions are independent of the program: • Interrupts can happen at any time (asynchronous) 1/4/2010 3
Page 1: Microprocessor Fundamentals Topic 1
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 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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