BME303_lecture5 - BME303 Intro. to Computing Addition As...

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Unformatted text preview: BME303 Intro. to Computing Addition As weve discussed, 2s comp. addition is just binary addition. assume all integers have the same number of bits ignore carry out for now, assume that sum fits in n-bit 2s comp. representation 1 01101000 01101000 01101000 01101000 (104) 11110110 11110110 11110110 11110110 (-10) + 11110000 11110000 11110000 11110000 (-16) + (-9) 01011000 01011000 01011000 01011000 (88) (-19) Assuming 8-bit 2s complement numbers. BME303 Intro. to Computing Data Type: bit vector 7 = segments: a, c, d Microprocessor 2 1 1 1 Register (0x0D) BME303 Intro. to Computing Logical Operations Operations on logical TRUE or FALSE two states -- takes one bit to represent: TRUE=1, FALSE=0 3 A B A AND B 1 1 1 1 1 A B A OR B 1 1 1 1 1 1 1 A NOT A 1 1 AND OR NOT BME303 Intro. to Computing Examples of Logical Operations AND useful for clearing bits AND with zero = 0 AND with one = no change OR 11000101 11000101 11000101 11000101 AND 00001111 00001111 00001111 00001111 00000101 00000101 00000101 00000101 4 useful for setting bits OR with zero = no change OR with one = 1 NOT unary operation -- one argument flips every bit...
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This note was uploaded on 05/08/2008 for the course BME 303 taught by Professor Ren during the Spring '08 term at University of Texas at Austin.

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BME303_lecture5 - BME303 Intro. to Computing Addition As...

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