INTRODUCTION TO MICROPEOCESSOR
MODEL OF MICROPROCESSOR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is true about Encoded Mode?
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the unit contains registers to store the keyboard, display modes
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the counter internally decodes the least significant 2 bits and provides a decoded 1 out of 4 scan on SL0-SL3.
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the processor is requested service only if any key is pressed, otherwise the CPU will continue with its main task.
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the counter provides the binary count that is to be externally decoded to provide the scan lines for the keyboard and display.
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Explanation:
Detailed explanation-1: -The two operating modes of keyboard section are 2-key lockout and N-key rollover. In the 2-key lockout mode, if two keys are pressed simultaneously, only the first key is recognized. In the N-key rollover mode simultaneous keys are recognized and their codes are stored in FIFO.
Detailed explanation-2: -The control and timing registers store the keyboard and display modes and other operations programmed by CPU.
There is 1 question to complete.