In order to display numbers 0 to 9 we use the 7 segment display, those are 7 straight light emitting diodes or anodes denoted by the
letters a through g. each segment can be lighted up with the circuit of 7 segment decoder.
Decimal seven-segment decoder truth table
Inputs
Number
Display segment
Segments numbering sequences
D
C
B
A
a
b
c
d
e
f
g
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
0
2
1
1
0
1
1
0
1
0
0
1
1
3
1
1
1
1
0
0
1
0
1
0
0
4
0
1
1
0
0
1
1
0
1
0
1
5
1
0
1
1
0
1
1
0
1
1
0
6
1
0
1
1
1
1
1
0
1
1
1
7
1
1
1
0
0
0
0
1
0
0
0
8
1
1
1
1
1
1
1
1
0
0
1
9
1
1
1
1
0
1
1
All other combinations don't care
X
X
X
X
X
X
X
For any decimal number we can see the state of each segment, when 1 means that the segment is on (illuminated) and 0 is off.
Segment:
Seven segment (0 to 9 decimal) decoder circuit
0000
To present all hex characters, we must modify the gates circuits to represent the additional
characters A, b, C, d, E and F, and to display the corresponding states of the segments. We can see the new truth
table values, in the next table.
Seven-segment Hex decoder truth table
Inputs
Number
Display segment
Segments numbering sequences
D
C
B
A
a
b
c
d
e
f
g
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
0
2
1
1
0
1
1
0
1
0
0
1
1
3
1
1
1
1
0
0
1
0
1
0
0
4
0
1
1
0
0
1
1
0
1
0
1
5
1
0
1
1
0
1
1
0
1
1
0
6
1
0
1
1
1
1
1
0
1
1
1
7
1
1
1
0
0
0
0
1
0
0
0
8
1
1
1
1
1
1
1
1
0
0
1
9
1
1
1
1
0
1
1
1
0
1
0
A
1
1
1
0
1
1
1
1
0
1
1
b
0
0
1
1
1
1
1
1
1
0
0
C
1
0
0
1
1
1
0
1
1
0
1
d
0
1
1
1
1
0
1
1
1
1
0
E
1
0
0
1
1
1
1
1
1
1
1
F
1
0
0
0
1
1
1
K-map for segment -
Segment:
Seven-segment containing all segments - Hex decoder circuit
☖ Home
⇄ Units Converter
⧉ Geometry
Σ Math
✈ Physics
〶 Electricity
