Representation of negative number, Electrical Engineering

Representation of Negative Number:

As  mentioned  in chapter 1 in 8085  negative  numbers are represented in 2 complement  form  and subtraction is  performed  using 2  complemented  method.  If the  result of subtraction is negative  it will also  be in 2 complement  form. But  D7 ( left most bit) is used  to indicate sign  of a number. If D7  is 0 the number  is positive  and if D7  is 1  the number is negative D7  is 1 for  2 complement of  all D7 bit  numbers.

Important : Generally  people  have misconnect that the  difference  between a positive  number and a  negative  number is only in  D7.  They assume that if  +5 10 is  written  in 8 bit  binary as 00001012 then -510  can be  written  as 10000102, which  is not  correct.

Refer followings  table  showing various  positive  and negative numbers to understand the concept  of negative  number as used  in microprocessors.

a.All negative numbers have 1 in  their left  most bit positions.

b.All negative  numbers are 2  complement  form  of their  corresponding  positive  numbers.

c. All negative  have their  equivalent positive  decimal number. It is up to the programmer  and the  application that whether  to use it as  negative or positive number.

d.If two numbers are added/ subtracted the  result will be as desired whether is a singed  or unsigned operation. See  followings  example.

Posted Date: 4/4/2013 2:41:12 AM | Location : United States







Related Discussions:- Representation of negative number, Assignment Help, Ask Question on Representation of negative number, Get Answer, Expert's Help, Representation of negative number Discussions

Write discussion on Representation of negative number
Your posts are moderated
Related Questions

Uninterruptable power  Supply An uninterruptible  power supply  provides emergency power when  utility power  is not  available. It  maintains the supply  under  all condition

Q. Show the schematic arrangement for: (a) one- dimensional addressing, and (b) two-dimensional addressing, if a 32-kbit ROM is used to provide an 8-bit output word.


Bipolar Junction Transistor: Transistor construction: the emitter layer is heavily doped, the base is light doped and the collector is only lightly doped. Outer layer has wi

Can you do a survey paper on Wavelet and Subband Coding? I need 10 pages and I will provide the references.

Q. Show the Classifications of Data Network? Classifications of Data Network: Data Networks are categorized according to their geographical coverage: • Wide area networks

Determine about the satellite navigation In motor vehicles system is known as satellite navigation (sat nav). On board computer contains pre-stored road maps. Vehicle's exact

GIS Applications in Management of Power Distribution Systems: a.)        Inventory of existing network. b.)        Easy access to network details. c.)        Easy access

Note, the armature current is produced in pulses as the armature rotates under the poles, so the torque also pulsates. This can give rise to extra wear on bearings and the engin