Introduction to 8259 - Programmable Interrupt Controller | Summary and Q&A

TL;DR

The 8259 IC, also known as the PIC, is a programmable interrupt controller that handles interrupt operations in microprocessors.

Key Insights

• 😋 The 8259 IC relieves the microprocessor from the task of checking priorities and handling multiple interrupt requests.
• 😴 It can handle up to eight interrupt pins and can be used with different types of microprocessors.
• 😋 The 8259 IC can program interrupt requests as level triggered or edge triggered, providing flexibility in handling different types of interrupts.
• 😋 Cascading multiple 8259 ICs allows for the handling of more than eight interrupt requests.
• 🐕‍🦺 The 8259 IC provides interrupt vector addresses for interrupt service routines, ensuring efficient execution of interrupts.
• 🐕‍🦺 The 8259 IC can change the priority of interrupts even during the execution of the service routines.
• 😷 Interrupts can be masked individually using the 8259 IC, providing control over which interrupts are processed.

Transcript

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Questions & Answers

Q: What is the purpose of the 8259 IC?

The 8259 IC is used to handle interrupt operations in microprocessors, reducing the workload of the microprocessor in checking priorities and handling multiple interrupts.

Q: How many interrupt pins can the 8259 IC handle?

The 8259 IC can handle up to eight interrupt pins, allowing it to process up to eight interrupt requests simultaneously.

Q: Can the 8259 IC be used with any microprocessor?

Yes, the 8259 IC can be used with various types of microprocessors, including the 8080, 8085, 8086, and 8088.

Q: How does the 8259 IC handle more than eight interrupt requests?

When more than eight interrupt requests are needed, multiple 8259 ICs can be cascaded in a master-slave configuration, allowing up to 64 interrupt requests to be handled collectively.

Summary & Key Takeaways

• The 8259 IC is used to handle interrupt operations in microprocessors, relieving the microprocessor from the task of checking priorities and handling multiple interrupts.

• It can handle up to eight interrupt pins and can be used with various types of microprocessors.

• The 8259 IC can program interrupt requests as level triggered or edge triggered, and it can handle up to 64 interrupt requests when cascaded.