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Parallel Interfacing

Parallel Interfacing. Chapter 7. Parallel Interfacing. Parallel I/O Ports Using Parallel Ports Seven-Segment Displays Keypad Interfacing Liquid Crystal Displays Interrupt-Driven Traffic Lights. Port and Data Direction Registers. MC68HC711E9. PORTA. Parallel Interfacing.

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Parallel Interfacing

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  1. Parallel Interfacing Chapter 7

  2. Parallel Interfacing • Parallel I/O Ports • Using Parallel Ports • Seven-Segment Displays • Keypad Interfacing • Liquid Crystal Displays • Interrupt-Driven Traffic Lights

  3. Port and Data Direction Registers

  4. MC68HC711E9

  5. PORTA

  6. Parallel Interfacing • Parallel I/O Ports • Using Parallel Ports • Seven-Segment Displays • Keypad Interfacing • Liquid Crystal Displays • Interrupt-Driven Traffic Lights

  7. Turning on an LED

  8. Using an AC Relay

  9. Interfacing a switch input HEX F0 DDRH C! : ?open ( -- f ) 2 PORTH ?HI ;

  10. Parallel Interfacing • Parallel I/O Ports • Using Parallel Ports • Seven-Segment Displays • Keypad Interfacing • Liquid Crystal Displays • Interrupt-Driven Traffic Lights

  11. Common Anode 7-Segment Display

  12. Interfacing a 7-Segment Display

  13. Common-Cathode Displays The MC14495-1 7 6 5 4 3 2 1 0 2 digits: PORTH: 0 0 LE1LE0 D C B A

  14. Parallel Interfacing • Parallel I/O Ports • Using Parallel Ports • Seven-Segment Displays • Keypad Interfacing • Liquid Crystal Displays • Interrupt-Driven Traffic Lights

  15. 4 x 4 Hex Keypad

  16. Registers associated with parallel I/O on Port J

  17. Scanning a 4 x 4 keypad

  18. Scanning a 4 x 4 keypad : keypad ( -- n ) BEGIN ?keypad UNTIL ;

  19. Axiom Keypad

  20. Axiom 4 x 4 Hex Keypad 1 2 3 4 Row Col 1 2 3 A 1K 4 PH0 4 5 6 B 3 PH1 7 8 9 C 2 PH2 * 0 # D 1 PH3 PH4 PH5 PH6 PH7

  21. Debounce

  22. Displaying keys pressed on a 7-segment display : keypad ( -- n ) BEGIN ?keypad UNTIL ; : wait.for.keyup ( -- ) BEGIN ?keypad WHILE DROP REPEAT ; : main.keypad ( -- ) init.key BEGIN keypad .led wait.for.keyup AGAIN ;

  23. Including debounce when reading a keypad

  24. The 74C922 16-Key Encoder

  25. Reading a keypad using the 74C922 16-Key Encoder

  26. Interfacing a 16 x 1 hex keypad to a 68HC711E9 using a 74154

  27. Scanning a 16 x 1 keypad

  28. Parallel Interfacing • Parallel I/O Ports • Using Parallel Ports • Seven-Segment Displays • Keypad Interfacing • Liquid Crystal Displays • Interrupt-Driven Traffic Lights

  29. Liquid Crystal Display

  30. Relationship between RS, R/W, and E

  31. Axiom LCD

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