INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is a command used to set and read the interrupt mask register.
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ICW1
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ICW2
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OCW1
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OCW2
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Explanation:
Detailed explanation-1: -OCW1 is used to read or set the interrupt mask register.
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.
Detailed explanation-3: -The function of ICW1 is to tell the 82C59A how it is being used in the system (i.e. Single or cascaded, edge or level triggered interrupts etc.). ICW2: This control word is always issued directly after ICW1. When addressing this ICW, the A0 line from the address bus must be a one (high).
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