Describe the functions of each of the following parts of the keyboard entry circuit of Figure 9-16.
Question:
Describe the functions of each of the following parts of the keyboard entry circuit of Figure 9-16.
(a) OR gate
(b) 74147 encoder
(c) One-shot
(d) Flip-flops X, Y, Z
(e) Flip-flops Q0 to Q11
Figure 9-16
Transcribed Image Text:
Digit keys +5 V 1 k0 For switch bounce 1p DT OS Q Ō 20 ms Pull-up resistor for each input 74LS147 decimal- to-BCD encoder CLK K ā₂ MSB LSB CLR X X J CLK K CLR Y J PRE CLK K Z Z D D Lo To decoder/drivers and displays D Q₁0 CLK D Q11 CLK CLK CLK CLK CLK CLK CLK 3 F Q₂ Q₂ CLK ^ Q₂ BCD code for MSD Second MSD
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a Produces a PGT when a key is pressed b Converts ...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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