Hi
Need to do this.
1/25000*125000*60
if i do like this,

timer = (TMR1H << 8)| TMR1L;

  tid_rpm= timer *(timer_tick+1);

nyrpm =1/tid_rpm*125000*60;

Any hint on doing this ?

have define all as float.

 

http://www.piclist.com/techref/microchip/math/div/index.htm

 

Any hint on doing what?

If you expect any help you need to state what you are trying to accomplish.

Unless 1/187,500,000,000 = 5.3333333333333333333333333333333e-12 is the answer you need.

 

And i thought the answer was 300.
The correct order of operations would be 125000*60/25000 in order to prevent loss of precision.

 

Which PIC is it you want to do a divide function inside? A PIC16F doesn't have hardware multipliers, only PIC18F and PIC24F have them.

 

And i thought the answer was 300.
The correct order of operations would be 125000*60/25000 in order to prevent loss of precision.

Yes that way works.
16f690 is the Pic.