Design a keypad controller to connect a gumnut core to the


Design a keypad controller to connect a Gumnut core to the keypad described in Exercise 8.1. The controller should include an output register for driving row lines and an input register for sensing column lines.

Exercise 8.1

A calculator has keys arranged as shown in Figure 8.41. Show how the key switches can be arranged in a scanned matrix.

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Electrical Engineering: Design a keypad controller to connect a gumnut core to the
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