0 1 2 3 r₁ 4 5 6 7 52 89 # T3 * C₁ C₂ C3 C4 The keypad has seven output lines, three for row and four for column locatio

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0 1 2 3 R 4 5 6 7 52 89 T3 C C C3 C4 The Keypad Has Seven Output Lines Three For Row And Four For Column Locatio 1 (21.41 KiB) Viewed 44 times

0 1 2 3 r₁ 4 5 6 7 52 89 # T3 * C₁ C₂ C3 C4 The keypad has seven output lines, three for row and four for column locations, respectively. When a key is pressed, corresponding row and column lines will produce logic level 1. Use VHDL to design a combinational circuit working as a keypad decoder. The input of the circuit will be output lines of the keypad. The output of the circuit will be the corresponding binary number in four bits. If or # key is pressed, the output of the circuit will be zero.