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 pin configuration used internally for timing
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AO
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BD
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CLK
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CN/ST CS
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Explanation:
Detailed explanation-1: -The internal clock frequency of the 8279 is nominally 100 kHz. An internal prescaler divides an externally applied clock by an integer between 2 and 31 (both inclusive) to produce the internal clock. The RESET signal sets the 8279 in 16-character display with two-key lockout keyboard modes.
Detailed explanation-2: -How can you derive it from any available clock signal? The internal operating frequency of the 8279 is 100kHz. By dividing the available clock signal by the program clock word, it is obtained.
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