(a) For Figure 9-44, describe the conditions necessary to transmit data from device 3 to the microprocessor....
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(a) For Figure 9-44, describe the conditions necessary to transmit data from device 3 to the microprocessor.
(b) What will the status of the data bus be when none of the devices is enabled?
Figure 9-44
Transcribed Image Text:
CLOCK ENABLE 1 Keyboard ENABLE 2> Device-1 eight-bit counter Device-2 keyboard. encoder aggagag OE OE Data bus Microprocessor (CPU) Device-3 74HC126 buffers DIP switches OE < ENABLE 3 Note: V indicates tristate outputs.
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a ENABLE 3 must be activated ENABLE 1 and ENABLE 2 must be in their inactive state This will put the ...View the full answer
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Related Book For
Digital Systems Principles And Application
ISBN: 9780134220130
12th Edition
Authors: Ronald Tocci, Neal Widmer, Gregory Moss
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