A panel has a 3x4 matrix keypad and four pushbuttons. What is the minimum number of GPIOS required to scan the keypad and all the pushbuttons if they are all connecte together to allow a single scan? 16 8 7 12

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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A panel has a 3x4 matrix keypad and four pushbuttons. What is the minimum number of GPIOs required to scan the keypad and all the pushbuttons if they are all connected together to allow a single scan?

- ○ 16
- ○ 8
- ○ 7
- ○ 12

This question requires understanding how to interface a matrix keypad and additional pushbuttons with GPIO (General Purpose Input/Output) pins. The options suggest different quantities of GPIOs, with an emphasis on determining the most efficient configuration.
Transcribed Image Text:A panel has a 3x4 matrix keypad and four pushbuttons. What is the minimum number of GPIOs required to scan the keypad and all the pushbuttons if they are all connected together to allow a single scan? - ○ 16 - ○ 8 - ○ 7 - ○ 12 This question requires understanding how to interface a matrix keypad and additional pushbuttons with GPIO (General Purpose Input/Output) pins. The options suggest different quantities of GPIOs, with an emphasis on determining the most efficient configuration.
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