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7-Segment Displays

7-Segment Displays. Lecture L6.7 Section 6.5. Turning on an LED. Turning on an LED. This is what we use in Lab. 7-Segment Display. a. f. b. g. e. c. d. 7-Segment Display. a b c d e f g 0 1 1 1 1 1 1 0 1 0 1 1 0 0 0 0 2 1 1 0 1 1 0 1 3 1 1 1 1 0 0 1 4 0 1 1 0 0 1 1

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7-Segment Displays

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  1. 7-Segment Displays Lecture L6.7 Section 6.5

  2. Turning on an LED

  3. Turning on an LED This is what we use in Lab

  4. 7-Segment Display

  5. a f b g e c d 7-Segment Display a b c d e f g 0 1 1 1 1 1 1 0 1 0 1 1 0 0 0 0 2 1 1 0 1 1 0 1 3 1 1 1 1 0 0 1 4 0 1 1 0 0 1 1 5 1 0 1 1 0 1 1 6 1 0 1 1 1 1 1 7 1 1 1 0 0 0 0

  6. a f b g e c d 7-Segment Display a b c d e f g 8 1 1 1 1 1 1 1 9 1 1 1 1 0 1 1 A 1 1 1 0 1 1 1 b 0 0 1 1 1 1 1 C 1 0 0 1 1 1 0 d 0 1 1 1 1 0 1 E 1 0 0 1 1 1 1 F 1 0 0 0 1 1 1

  7. D1 & !D0 D3 & D2 !D2 & !D0 D3 & D1 K-Map for Segment e e = D3 & D2 # !D2 & !D0 # D3 & D1 # D1 & !D0 D1 D0 00 01 11 10 D3 D2 00 1 1 01 1 11 1 1 1 1 10 1 1 1

  8. Makes this module available in higher-level modules hex7seg.abl MODULE hex7seg INTERFACE ([D3..D0] -> [a,b,c,d,e,f,g]); TITLE 'hex to seven segment display decoder' " a " --- hex-to-seven-segment decoder " f| g |b " --- " e| d |c " --- DECLARATIONS " Input Pins " D3..D0 PIN; " display input value D = [D3..D0]; " 4-bit input vector " Output Pins " [a,b,c,d,e,f,g] PIN ISTYPE 'com'; " output values " Definitions " ON,OFF = 1,0; " for common cathode LEDs

  9. HEX EQUATIONS @radix 16; truth_table (D -> [ a , b , c , d , e , f , g ]) 0 -> [ ON, ON, ON, ON, ON, ON, OFF]; 1 -> [OFF, ON, ON, OFF, OFF, OFF, OFF]; 2 -> [ ON, ON, OFF, ON, ON, OFF, ON]; 3 -> [ ON, ON, ON, ON, OFF, OFF, ON]; 4 -> [OFF, ON, ON, OFF, OFF, ON, ON]; 5 -> [ ON, OFF, ON, ON, OFF, ON, ON]; 6 -> [ ON, OFF, ON, ON, ON, ON, ON]; 7 -> [ ON, ON, ON, OFF, OFF, OFF, OFF]; 8 -> [ ON, ON, ON, ON, ON, ON, ON]; 9 -> [ ON, ON, ON, ON, OFF, ON, ON]; 0A -> [ ON, ON, ON, OFF, ON, ON, ON]; 0B -> [OFF, OFF, ON, ON, ON, ON, ON]; 0C -> [ ON, OFF, OFF, ON, ON, ON, OFF]; 0D -> [OFF, ON, ON, ON, ON, OFF, ON]; 0E -> [ ON, OFF, OFF, ON, ON, ON, ON]; 0F -> [ ON, OFF, OFF, OFF, ON, ON, ON]; END hex7seg hex7seg.abl (cont.)

  10. MODULE main7seg TITLE 'hex to seven segment display decoder' DECLARATIONS hex7seg INTERFACE([D3..D0] -> [a,b,c,d,e,f,g]); d7L FUNCTIONAL_BLOCK hex7seg; d7R FUNCTIONAL_BLOCK hex7seg; " Input Pins " L3..L0 PIN 11,7,6,5; " Left Switches S6 - 1..4 L = [L3..L0]; " 4-bit input vector R3..R0 PIN 4,3,2,1; " Right Switches S7 - 1..4 R = [R3..R0]; " 4-bit input vector " Output Pins " [a,b,c,d,e,f,g] PIN 57,58,61,62,63,65,66 ISTYPE 'com'; "Leftmost (tens) 7-segment LED display [aa,bb,cc,dd,ee,ff,gg] PIN 15,18,23,21,19,14,17 ISTYPE 'com'; " Rightmost (units) 7-segment LED display EQUATIONS [a,b,c,d,e,f,g] = d7L.[a,b,c,d,e,f,g]; d7L.[D3..D0] = L; [aa,bb,cc,dd,ee,ff,gg] = d7R.[a,b,c,d,e,f,g]; d7R.[D3..D0] = R; END main7seg main7seg.abl

  11. MODULE main7seg TITLE 'hex to seven segment display decoder' DECLARATIONS hex7seg INTERFACE([D3..D0] -> [a,b,c,d,e,f,g]); d7L FUNCTIONAL_BLOCK hex7seg; d7R FUNCTIONAL_BLOCK hex7seg; " Input Pins " L3..L0 PIN 11,7,6,5; " Left Switches S6 - 1..4 L = [L3..L0]; " 4-bit input vector R3..R0 PIN 4,3,2,1; " Right Switches S7 - 1..4 R = [R3..R0]; " 4-bit input vector

  12. " Output Pins " [a,b,c,d,e,f,g] PIN 57,58,61,62,63,65,66 ISTYPE 'com'; "Leftmost (tens) 7-segment LED display [aa,bb,cc,dd,ee,ff,gg] PIN 15,18,23,21,19,14,17 ISTYPE 'com'; " Rightmost (units) 7-segment LED display EQUATIONS [a,b,c,d,e,f,g] = d7L.[a,b,c,d,e,f,g]; d7L.[D3..D0] = L; [aa,bb,cc,dd,ee,ff,gg] = d7R.[a,b,c,d,e,f,g]; d7R.[D3..D0] = R; END main7seg

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