How many I/O lines would be needed for an MCU system that has a 4-digit multiplexed...

Question

Question

How many I/O lines would be needed for an MCU system that has a 4-digit multiplexed LED numeric display (with decimal points) and a 12-button keypad?

engineering Computer-Science

Answer 1

Answer #1

Solution:

23 I/O lines would be needed for an MCU system that has a 4-digit multiplexed LED numeric display (with decimal points) and a 12-button keypad.

Reason:

MCU is the standard display device which is used to display 4 digits on a multiplexed screen.
When this device is designed , the MCU is predesigned with 23 I/O lines , each I/O lines carries the part of display on the LED screen.

Answer 2

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