Binary 7bit to ASCII decimal 3 digits by Bob Axtell

Code:

• ; BINARY TO ASCII ROUTINES
  ; this is NOT the smallest converter but its the fastest...
  ;***************************************************************
  ; this table will convert 0 to 99 in binary to packed BCD
  ;***************************************************************
  ; binary to packed bcd 00-99 7 bits only jump table
  bin2pak:
          addwf   PCL,f
          retlw   0
          retlw   1
          retlw   2
          retlw   3
          retlw   4
          retlw   5
          retlw   6
          retlw   7
          retlw   8
          retlw   9
          retlw   h'10'
          retlw   h'11'
          retlw   h'12'
          retlw   h'13'
          retlw   h'14'
          retlw   h'15'
          retlw   h'16'
          retlw   h'17'
          retlw   h'18'
          retlw   h'19'
          retlw   h'20'
          retlw   h'21'
          retlw   h'22'
          retlw   h'23'
          retlw   h'24'
          retlw   h'25'
          retlw   h'26'
          retlw   h'27'
          retlw   h'28'
          retlw   h'29'
          retlw   h'30'
          retlw   h'31'
          retlw   h'32'
          retlw   h'33'
          retlw   h'34'
          retlw   h'35'
          retlw   h'36'
          retlw   h'37'
          retlw   h'38'
          retlw   h'39'
          retlw   h'40'
          retlw   h'41'
          retlw   h'42'
          retlw   h'43'
          retlw   h'44'
          retlw   h'45'
          retlw   h'46'
          retlw   h'47'
          retlw   h'48'
          retlw   h'49'
          retlw   h'50'
          retlw   h'51'
          retlw   h'52'
          retlw   h'53'
          retlw   h'54'
          retlw   h'55'
          retlw   h'56'
          retlw   h'57'
          retlw   h'58'
          retlw   h'59'
          retlw   h'60'
          retlw   h'61'
          retlw   h'62'
          retlw   h'63'
          retlw   h'64'
          retlw   h'65'
          retlw   h'66'
          retlw   h'67'
          retlw   h'68'
          retlw   h'69'
          retlw   h'70'
          retlw   h'71'
          retlw   h'72'
          retlw   h'73'
          retlw   h'74'
          retlw   h'75'
          retlw   h'76'
          retlw   h'77'
          retlw   h'78'
          retlw   h'79'
          retlw   h'80'
          retlw   h'81'
          retlw   h'82'
          retlw   h'83'
          retlw   h'84'
          retlw   h'85'
          retlw   h'86'
          retlw   h'87'
          retlw   h'88'
          retlw   h'89'
          retlw   h'90'
          retlw   h'91'
          retlw   h'92'
          retlw   h'93'
          retlw   h'94'
          retlw   h'95'
          retlw   h'96'
          retlw   h'97'
          retlw   h'98'
          retlw   h'99'
  ;**************************************************************
  ;        7-BIT BINARY TO 3-BYTE ASCII
  ; Mostly used to make binary to ASCII for Displays
  ;         Input in 7 bits
  ;  Output in ASCII: tmp1 (1s), tmp2 (10s), tmp (100s)
  ;**************************************************************
  bin2asc:
          andlw   h'7f'      ;7 bits only
          movwf   tmp1
          clrf    tmp
          addlw   d'256'-d'100' ;2s compl
          btfss   status,c  ;>99, subtract 100
          goto    bin2a
          incf    tmp,f     ;above 99, indicate 100s
          movwf   tmp1
  bin2a:
          movf    tmp1,w
          call    bin2pak   ;bin to 2-packed bin 99 max
  ;
  ; exit here if all you need is packed BCD (h'00' to h'99')
  ;
          movwf   tmp1      ;remainder converts packed BCD to 3-ASCII
          movwf   tmp2
          swapf   tmp2,f
          movlw   b'1111'
          andwf   tmp1,f
          andwf   tmp2,f
          movlw   '0'
          addwf   tmp1,f   ;1's done
          addwf   tmp2,f   ;10's done
          addwf   tmp,f    ;100's done
          return
  ;*****************************************************************
  
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