[Solved] 20 Points Multiplexed 4×3 Keypad Shown Next Page Key Pressed Joins Corresponding Row Colum Q37177610
(20 points) A multiplexed 4×3 keypad is shown on the next page. Each key, when pressed, joins the corresponding row and column lines. 5. The row lines are connected to processor output pins through isolation diodes and are driven to a logic high one at a time. The column lines are connected to processor input pins and are scanned for a logic high one at a time. The isolation diodes prevent one row line (processor output) from loading another if two keys in a given column happen to be pressed at once. You may treat the diodes as ideal in this problem (that is, open circuits when reversed biased and short circuits when forward biased). The pul-down resistors shown ensure that open-circuited column lines remain at a logic low. Suppose that both the 5 and 9 keys are pressed. Complete the given timing diagram on the next page to show the waveforms at the column lines over two scan cycles a) b) Determine the maximum number of simultaneous keypresses that can be correctly detected by the processor, assuming that the appropriate software has been written to accomplish this task. Consider all possible combinations of keys, since their relative row and column locations may matter in determining this number. Be sure to justify your answer by explaining your reasoning. maximum number of simultaneous keypresses- Justification/explanation for this conclusion: Show transcribed image text (20 points) A multiplexed 4×3 keypad is shown on the next page. Each key, when pressed, joins the corresponding row and column lines. 5. The row lines are connected to processor output pins through isolation diodes and are driven to a logic high one at a time. The column lines are connected to processor input pins and are scanned for a logic high one at a time. The isolation diodes prevent one row line (processor output) from loading another if two keys in a given column happen to be pressed at once. You may treat the diodes as ideal in this problem (that is, open circuits when reversed biased and short circuits when forward biased). The pul-down resistors shown ensure that open-circuited column lines remain at a logic low. Suppose that both the 5 and 9 keys are pressed. Complete the given timing diagram on the next page to show the waveforms at the column lines over two scan cycles a) b) Determine the maximum number of simultaneous keypresses that can be correctly detected by the processor, assuming that the appropriate software has been written to accomplish this task. Consider all possible combinations of keys, since their relative row and column locations may matter in determining this number. Be sure to justify your answer by explaining your reasoning. maximum number of simultaneous keypresses- Justification/explanation for this conclusion:
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