EE101Lecture3

# EE101Lecture3 - Lecture 3 Slides Negative Numbers(Signed...

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© Mark Redekopp, All rights reserved Binary Representation Systems Integer Systems Unsigned Unsigned (Normal) binary Signed Signed Magnitude 2‟s complement 1’s complement* Excess-N* Floating Point* For very large and small (fractional) numbers Codes Text ASCII / Unicode Decimal Codes Weighted Codes BCD (Binary Coded Decimal) / (8421 Code) 2421 Code* 84-2-1 Code Non-weighted Codes Excess-3 * = Not covered in this class
© Mark Redekopp, All rights reserved Interpreting Binary Strings • Given a string of 1‟s and 0‟s, you need to know the representation system being used, before you can understand the value of those 1‟s and 0‟s. Information (value) = Bits + Context (System) 01000001 = ? 65 10 „A‟ ASCII 41 BCD Unsigned Binary system ASCII system BCD System

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© Mark Redekopp, All rights reserved a b c d e f g a b c d e f g 4-bit BCD digit BCD-to-7 segment decoder 0 0 0 1 0 1 0 1 0 1 1 1 7-Segment Displays for outputting decimal numbers
© Mark Redekopp, All rights reserved Binary Representation Systems Integer Systems Unsigned Unsigned (Normal) binary Signed Signed Magnitude 2‟s complement 1’s complement* Excess-N* Floating Point For very large and small (fractional) numbers Codes Text ASCII / Unicode Decimal Codes Weighted Codes BCD (Binary Coded Decimal) / (8421 Code) 2421 Code* 84-2-1 Code Non-weighted Codes Excess-3 * = Not covered in this class

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