divdee.asm

非常实用的AD和pwm的ad公司21990dsp芯片的控制源代码

/* signed division 
inputs:
ay1-16 MSB of numerator
ay0-   LSB
ar-denomitor
outputs:
ar-corrected quotient
*/
.GLOBAL  divdee;
.section/pm	seg_pmcode;

divdee: 
      MR=0;
      mr0=ar,ar=abs ar;
      divs ay1,ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      divq ar; divq ar;
      ar=ay0,af=pass mr0;
      if LT ar=-ay0;
      rts;
/*    ax0 = ar; 

	af = pass ay0; ay0 = 0;						// Does the Y'/X' division.
	divs af, ax0;
	divq ax0; divq ax0; divq ax0; divq ax0; divq ax0;
	divq ax0; divq ax0; divq ax0; divq ax0; divq ax0;
	divq ax0; divq ax0; divq ax0; divq ax0; divq ax0;
    ar = pass ay0;