INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This command word selects the register to be read, the operation of the special mask register and the poll command.
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ICW2
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ICW3
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OCW2
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OCW3
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Explanation:
Detailed explanation-1: -8259 has four initialization command words namely ICW1, ICW2, ICW3, and ICW4 and three operation command words namely as OCW1, OCW2, and OCW3. The processor reads the status of 8259 by reading at the two ports termed as low port and the high port.
Detailed explanation-2: -Interrupt mask register(IMR): → The Interrupt Mask Register is a read and write register. → This register enables or masks interrupts from being triggered on the external pins of the Cache Controller. → The IMR is used to disable (Mask) or enable (Unmask) individual interrupt request inputs.
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