INTRODUCTION TO MICROPEOCESSOR
MICROCOMPUTER SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This is an 8279 control word that is issued to clear the IRQ pin to zero in the sensor matrix mode.
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Interrupt Mask Register
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End of Interrupt
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Display Write Inhibit
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Non-Maskable Interrupt
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Explanation:
Detailed explanation-1: -The control signals WR (low), RD (low), CS (low) and A0 are used for read/write to 8279.
Detailed explanation-2: -8279 programmable keyboard/display controller is designed by Intel that interfaces a keyboard with the CPU. The keyboard first scans the keyboard and identifies if any key has been pressed. It then sends their relative response of the pressed key to the CPU and vice-a-versa.
Detailed explanation-3: -Explanation: The scanned keyboard special error mode is programmed using end interrupt/error mode set command.
There is 1 question to complete.