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1101 -> 0010 ?

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TipGiver

TipGiver

Programmer
Sep 1, 2005
1,863
I have this: 1101 and i want to get this: 0010. I don't know the right word... All i need is to get the reversed number. Also need to get the 0011, which is reversed(1101) + 1 at binary.


Did you understand me?
Tnx
 
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It isn't reversed, it's inverted.

If it was reversed it would be 1011.

What processor are you using?
 
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yes invert the bits.
This is also the result of the logical not.

it is z80.
 
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If you are using a Z80 (of immortal memory), then the instruction to complement the accumulator is CPL.

This gives you the one's complement of the accumulator.

NEG performs a two's complement of the accumulator.
(This is a one's complement with one added to the result).

I have just found a really ancient (83/84) zilog databook...
 
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And in some processors the simple inversion would be carried out as an exclusive or with 1111.
 
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