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Questions about ones-complement

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Questions - ones-complement

Why the status flags in AVR are on after one's-complementing a zeroed register?

I have a code in assembly and I have to find out why the status flags are on One of the codes is LDI R16, 0 COM R16 the result was 0xFF But I don’t understand why the S and C flags were on.
test-img

m A

assembly

avr

ones-complement

Votes: 0

Answers: 1

Latest Answer

COM isn't "complete", it's "one's complement" (bitwise inversion). Read the manual which explains how each instruction sets flags. http://atmel-studio-doc.s3-website-us-east-1.ama...
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Peter Cordes

Why complement of 0 is -1?

I was learning about bitwise operators and I learnt that complement of 0 is 1 and 1 is 0. But when I tried using ~0 on IDLE, it printed -1 and when i typed ~1 it gave -2..
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Satyam Shankar

python

binary

twos-complement

complement

ones-complement

Votes: 0

Answers: 1

Latest Answer

-1 is 0-1 => 00..00-00...01 = 1..11 So, as long as you consider some finite width (width is the size of integer or binary form you are using,4,8 ....),it is true that: 00..00 =~11..11 then, th...
test-img

Ixtiyor Majidov

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