Question
Download Solution PDFConsider the following statements regarding programmable interrupt controller 8259A:
1. 8259A is specifically designed for use with the interrupt signals (INTR/INT) of 8085 microprocessor.
2. It can solve eight levels of interrupt priorities in a variety of modes.
3. With additional 8259A devices, the priority scheme can be expanded to 32 levels.
Which of the above statements is/are not correct?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF8259A : Programmable Interrupt Counter
It is designed to work with intel microprocessors 8085,8086 and 8088.
It can read the status of pending interrupts , in-service interrupts and masked interrupts.
It manages 8 interrupt requests and priorities.
It can be expanded to 64 priority levels .
It can vector an interrupt anywhere in memory without any additional hardware.
Hence correct option is "1"Additional Information
It has two types of command words
- Initialization command words
- Operational command words
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