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# Copy of 8 Bit Adder/Subtractor

Engr 17 Calculator
by

## Charle Magne Olano

on 2 August 2013

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#### Transcript of Copy of 8 Bit Adder/Subtractor

Conclusion
And one more thing...
Understanding
Analog to Digital Converter
When one gate closes
another gate opens...
TI-8 Creators
Michael Dutra- Third year mechanical engineering student
Trent Canales- Second year
mechaincal engineering student
Michael Parker- Second year
mechaincal engineering student
Logic gates and logic chip functions
Foundation of computing operations
Binary numbering system and math
Digital age
Abstract
Introduction
8-Bit analog adder/subtractor -7 segment display
EXPERIMENT
Theory
Procedure
Results
Binary Theory
Theory
Procedure
Results
Switched inputs
Input LEDs
Output LEDs
7+1=8
3+2=5
Base 2 method of counting; uses 0 and 1
Computers: symbolizes on and off commands
1 digit = 1 bit; 8 bits = 1 byte
How binary counting works
Binary Counting
101
Binary/Decimal Reference
Binary/Decimal Conversion
Theory
Procedure
Results
Theory
Procedure
Results
Why analog to digital?
How it works
Expected results
Construction of the circuit
Important things to know
Example of Analog to digital converter operation
-Changing voltage results in changing output number
8-bit Adder subtractor with 7 segment display
Procedure
Procedure
Theory
Results
Procedure
Theory:
Seven Segment Displays
Internal wiring of displays
Common anode vs cathode
Seven segment decimal counting
Logic Gates
Purpose- Logic Gates allow circuits to make logical decisions that produce one output when receiving one or more inputs.
Basic Gates- Basic gates include OR, AND, and NOT gates.
Universal Gates- Universal gates include NAND, NOR, and X-OR gates.
Logic Gates
AND GATE -The AND gate performs logical multiplication, known as the AND function. The output is high only when both inputs are high. If either or both inputs are low then the output is low.
OR GATE – The OR gate performs logical addition, known as the OR function. The output is high when one or both inputs are high. The output is low only when both inputs are low.
X-OR GATE – The output is high when any one of the inputs is high. The output is low when both inputs are low, or both inputs are high.
Logic Gates
X-OR GATE -
AND GATE –

OR GATE –
Chips
Wiring Tools
Circuit Elements
Foundation
Procedure:
Seven Segment Displays
Relocation of LEDs
Installed decoder chips and seven segment displays
-LEDs remained upon the addition of seven segment displays for clarity
Theory cont.
Addition of two eight bit numbers
-BCD
-Third display necessary
complete nine bit solution
Results:
Seven Segment Display
Example comparing binary and decimal input and outputs
Theory:
Analog to Digital
Procedure:
Analog to Digital
-Analog and digital ground
-Chip reset
-Nothing left floating
Results:
Analog to Digital
Theory:
Subtractor
Performed bit pair to bit pair from right.
Result < 0, must ‘borrow’
Expectations: 1 number; difference of inputs
Carry Light Significance
Theory (Cont.)
Subtractor Schematic
Procedure:
Subtractor
Tap/Wire in XOR chip #7486
Integrate Carry Connections
Results:
Subtractor
3 - 2 = 1*
7 - 1 = 6*
Optimization: Time and Materials
Divide and conquer
Theory:
Theory:
Theory:
Theory:
Theory:
Theory:
Theory:
Procedure:
Full transcript