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Subject element from formula

  1. May 24, 2013 #1
    1. The problem statement, all variables and given/known data
    Subject the "PR2" from the following equation


    2. Relevant equations
    Tpwm = [(PR2) + 1] • 4 • TOSC • N

    • = multiply

    3. The attempt at a solution

    Actually I am not a student
    As well as I know how the equation after subject the "PR2"... PR2 = [Fosc / (Fpwm * 4 * N )] - 1
    where( Tosc = 1 / Fosc ) as well as Tpwm = 1/ Fpwm

    I found above equation when I study the micro controller programming myself
    I can not remember now maths
    so I need to subject the "PR2" from above equation
    so I need the all every steps and rule I need to follow for above matter

    Please help
    Thanks in advance
     
    Last edited: May 24, 2013
  2. jcsd
  3. May 24, 2013 #2

    rock.freak667

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    Homework Helper

    If the • are multiply, then you can just divide by each term that is being multiplied and carry across the 1 to the next side.

    Basically, divide both sides of the equation by the N, 4 and so on. Then subtract 1 from both sides of the equation.
     
  4. May 24, 2013 #3
    Can you please show me a step

    Thanks in advance
     
  5. May 24, 2013 #4
    ok

    Step1 - Tpwm / 4 * TOSC * N = (PR2) - 1 ..; Is this correct?
    Step2 - (Tpwm - PR2) / 4 * TOSC * N = -1 ..; Is this correct?

    Please help
     
  6. May 24, 2013 #5

    rock.freak667

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    Step 1 is somewhat correct, your equation should be


    [tex]\frac{Tpwm}{4*TOSC*N} = PR2 +1[/tex]

    Now if you subtract 1 from both sides what do you get on the left side? What is left on the right side?
     
  7. May 24, 2013 #6
    Next = [ Tpwm / ( 4 * TOSC * N ) ] - 1 = PR2 + 1 - 1

    now [ Tpwm / ( 4 * TOSC * N ) ] - 1 = PR2 writr?
     
  8. May 25, 2013 #7

    rock.freak667

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    That should be correct now.
     
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