7-Segment Displays
20
7-Segment Displays Lecture L6.1 Section 6.3
description
7-Segment Displays. Lecture L6.1 Section 6.3. 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 - PowerPoint PPT Presentation
Transcript of 7-Segment Displays
7-Segment Displays
Lecture L6.1
Section 6.3
Turning on an LED
+5VR LED
PLD output pin
+5VR LED
PLD output pin
1
0
+5V
+0.2V+1.7V
No current
Currentlight
no light
R =voltagecurrent
=5 1.7
15 x 10 -3 = 220 ohms
Turning on an LED
This is whatwe use in Lab
CPLD output pin0 V R
No Current
LED
no light
CPLD output pin+3.2 V R
Current
LED
light
R = voltage = 3.2 - 1.9 = 325 ohms current 4 x 10^-3
+1.9 V 0 V
0 V
0
1
R = 330 ohms
7-Segment Display
a b c d e f g
a b c d e f g
+5V
CommonAnode
CommonCathode
a
b
c
d
e
f
g
7-Segment Displaya
b
c
d
e
f g
a b c d e f g0 1 1 1 1 1 1 01 0 1 1 0 0 0 02 1 1 0 1 1 0 13 1 1 1 1 0 0 14 0 1 1 0 0 1 15 1 0 1 1 0 1 16 1 0 1 1 1 1 17 1 1 1 0 0 0 0
7-Segment Displaya
b
c
d
e
f g
a b c d e f g8 1 1 1 1 1 1 19 1 1 1 1 0 1 1A 1 1 1 0 1 1 1b 0 0 1 1 1 1 1C 1 0 0 1 1 1 0d 0 1 1 1 1 0 1E 1 0 0 1 1 1 1F 1 0 0 0 1 1 1
K-Map for Segment e
1
1
1 1
1
D3 D2D1 D0
00 01 11 10
00
01
11
10
11
1
1
1D3 & D2 D1 & !D0
!D2 & !D0
e = D3 & D2 # !D2 & !D0 # D3 & D1 # D1 & !D0
D3 & D1
MODULE hex7segINTERFACE ([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; D = [D3..D0]; " 4-bit input vector " Output Pins "[a,b,c,d,e,f,g] PIN ISTYPE 'com'; " 7-segment LED display segs = [a,b,c,d,e,f,g];
hex7seg.abl Makes this module available in higher-level modules
a b c d e f g0 1 1 1 1 1 1 01 0 1 1 0 0 0 02 1 1 0 1 1 0 13 1 1 1 1 0 0 14 0 1 1 0 0 1 15 1 0 1 1 0 1 16 1 0 1 1 1 1 17 1 1 1 0 0 0 0 8 1 1 1 1 1 1 19 1 1 1 1 0 1 1A 1 1 1 0 1 1 1b 0 0 1 1 1 1 1C 1 0 0 1 1 1 0d 0 1 1 1 1 0 1E 1 0 0 1 1 1 1F 1 0 0 0 1 1 1
@radix 16;EQUATIONSwhen (D == 0) then segs = 7E;when (D == 1) then segs = 30;when (D == 2) then segs = 6D;when (D == 3) then segs = 79;when (D == 4) then segs = 33;when (D == 5) then segs = 5B;when (D == 6) then segs = 5F;when (D == 7) then segs = 70;when (D == 8) then segs = 7F;when (D == 9) then segs = 7B;when (D == 0A) then segs = 77;when (D == 0B) then segs = 1F;when (D == 0C) then segs = 4E;when (D == 0D) then segs = 3D;when (D == 0E) then segs = 4F;when (D == 0F) then segs = 47;
END hex7seg
hex7seg.abl (cont.)HEX
ON,OFF = 1,0; " for common cathode LEDs@radix 16;EQUATIONS
"[ a , b , c , d , e , f , g ]when (D == 0) then segs = [ ON, ON, ON, ON, ON, ON, OFF];when (D == 1) then segs = [OFF, ON, ON, OFF,OFF,OFF,OFF];when (D == 2) then segs = [ ON, ON, OFF,ON, ON, OFF, ON];when (D == 3) then segs = [ ON, ON, ON, ON, OFF,OFF, ON];when (D == 4) then segs = [OFF, ON, ON, OFF,OFF,ON, ON];when (D == 5) then segs = [ ON, OFF,ON, ON, OFF,ON, ON];when (D == 6) then segs = [ ON, OFF,ON, ON, ON, ON, ON];when (D == 7) then segs = [ ON, ON, ON, OFF,OFF,OFF,OFF];when (D == 8) then segs = [ ON, ON, ON, ON, ON, ON, ON];when (D == 9) then segs = [ ON, ON, ON, ON, OFF,ON, ON];when (D == 0A) then segs = [ ON, ON, ON, OFF,ON, ON, ON];when (D == 0B) then segs = [OFF, OFF,ON, ON, ON, ON, ON];when (D == 0C) then segs = [ ON, OFF,OFF,ON, ON, ON, OFF];when (D == 0D) then segs = [OFF, ON, ON, ON, ON, OFF, ON];when (D == 0E) then segs = [ ON, OFF,OFF,ON, ON, ON, ON];when (D == 0F) then segs = [ ON, OFF,OFF,OFF,ON, ON, ON];
END hex7seg
Alternate form of EQUATIONS
a = (D0 & D2 & !D3 # !D1 & !D2 & D3 # !D0 & !D2 # D1 & !D3 # !D0 & D3 # D1 & D2);
b = (D0 & D1 & !D3 # D0 & !D1 & D3 # !D0 & !D1 & !D3 # !D0 & !D2 # !D2 & !D3);
c = (D2 & !D3 # !D2 & D3 # D0 & !D1 # !D1 & !D2 # D0 & !D2);
Compiled Equations
Note they are reduced
d = (D1 & !D2 & !D3 # D0 & !D1 & D2 # !D0 & D1 & D2 # D0 & !D2 & D3 # !D0 & !D1 & !D2 # !D1 & D3);
e = (!D0 & !D2 # D2 & D3 # !D0 & D1 # D1 & D3);
f = (!D1 & D2 & !D3 # !D2 & D3 # !D0 & !D1 # !D0 & D2 # D1 & D3);
g = (!D1 & D2 & !D3 # D1 & !D2 # !D0 & D1 # !D2 & D3 # D0 & D3);
Compiled Equations (cont.)
Note that d is NOTcompletely reduced
Make Karnaugh map for d
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
Another alternate form of EQUATIONS
a = (D3 & D2 & D1 & D0 # !D3 & D2 & D1 & D0 # !D3 & !D2 & D1 & D0 # !D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # D3 & D2 & D1 & !D0 # !D3 & D2 & D1 & !D0 # D3 & !D2 & D1 & !D0 # !D3 & !D2 & D1 & !D0 # D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
b = (!D3 & D2 & D1 & D0 # !D3 & !D2 & D1 & D0 # D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # !D3 & !D2 & !D1 & D0 # D3 & !D2 & D1 & !D0 # !D3 & !D2 & D1 & !D0 # !D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
Compiled Equations
Note they are NOT reducedSum of all minterms
c = (!D3 & D2 & D1 & D0 # D3 & !D2 & D1 & D0 # !D3 & !D2 & D1 & D0 # D3 & D2 & !D1 & D0 # !D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # !D3 & !D2 & !D1 & D0 # !D3 & D2 & D1 & !D0 # D3 & !D2 & D1 & !D0 # !D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
d = (D3 & !D2 & D1 & D0 # !D3 & !D2 & D1 & D0 # D3 & D2 & !D1 & D0 # !D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # D3 & D2 & D1 & !D0 # !D3 & D2 & D1 & !D0 # !D3 & !D2 & D1 & !D0 # D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
e = (D3 & D2 & D1 & D0 # D3 & !D2 & D1 & D0 # D3 & D2 & !D1 & D0 # D3 & D2 & D1 & !D0 # !D3 & D2 & D1 & !D0 # D3 & !D2 & D1 & !D0 # !D3 & !D2 & D1 & !D0 # D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
f = (D3 & D2 & D1 & D0 # D3 & !D2 & D1 & D0 # !D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # D3 & D2 & D1 & !D0 # !D3 & D2 & D1 & !D0 # D3 & !D2 & D1 & !D0 # D3 & D2 & !D1 & !D0 # !D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0 # !D3 & !D2 & !D1 & !D0);
g = (D3 & D2 & D1 & D0 # D3 & !D2 & D1 & D0 # !D3 & !D2 & D1 & D0 # D3 & D2 & !D1 & D0 # !D3 & D2 & !D1 & D0 # D3 & !D2 & !D1 & D0 # D3 & D2 & D1 & !D0 # !D3 & D2 & D1 & !D0 # D3 & !D2 & D1 & !D0 # !D3 & !D2 & D1 & !D0 # !D3 & D2 & !D1 & !D0 # D3 & !D2 & !D1 & !D0);
main7seg.abl
d7Lhex7seg
d7Rhex7seg
L = S6_SW(1..4)
R = S7_SW(1..4) [a,b,c,d,e,f,g]
[aa,bb,cc,dd,ee,ff,gg]
MODULE main7segTITLE 'hex to seven segment display decoder'
DECLARATIONShex7seg 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..4L = [L3..L0]; " 4-bit input vector
R3..R0 PIN 4,3,2,1; " Right Switches S7 - 1..4R = [R3..R0]; " 4-bit input vector
d7Lhex7seg
d7Rhex7seg
L = S6_SW(1..4)
R = S7_SW(1..4) [a,b,c,d,e,f,g]
[aa,bb,cc,dd,ee,ff,gg]
" Output Pins "
[aa,bb,cc,dd,ee,ff,gg]
PIN 57,58,61,62,63,65,66 ISTYPE 'com';
"Leftmost (tens) 7-segment LED display
[a,b,c,d,e,f,g]
PIN 15,18,23,21,19,14,17 ISTYPE 'com';
" Rightmost (units) 7-segment LED display
EQUATIONS
[aa,bb,cc,dd,ee,ff,gg] = d7L.[a,b,c,d,e,f,g];
d7L.[D3..D0] = L;
[a,b,c,d,e,f,g] = d7R.[a,b,c,d,e,f,g];
d7R.[D3..D0] = R;
END main7seg
d7Lhex7seg
d7Rhex7seg
L = S6_SW(1..4)
R = S7_SW(1..4) [a,b,c,d,e,f,g]
[aa,bb,cc,dd,ee,ff,gg]
