### 10bit to BCD unpacked 3 digit in 25 inst 28 cycles (for PIC's with hardware multiplier only)

by Djula Djarmati

;**********************************************************************************************
;CONVERT 10-BIT BINARY TO THREE DECIMAL DIGITS (28 cycles, 25 program
memory)
;Input word:    Digits+1:Digits
;Output digits: Digits+2:Digits+1:Digits
;Trashes:       PRODH, PRODL
;**********************************************************************************************
Bin_To_Dec_999  movlw   d'41'                   ;Multiply by 0.01 (41/4096)
mulwf   Digits+1                ;
movff   PRODL, Digits+2         ;
mulwf   Digits                  ;
movf    PRODH, w                ;
mullw   0x10                    ;Lose the lower 8 bits
and shift
movf    PRODH, w                ;result 4 bits left
(divide by 4096)
movwf   Digits+2                ;Save result
mullw   d'100'                  ;and then multiply it
by 100
movf    PRODL, w                ;
subwf   Digits, f               ;Subtract from original
movf    PRODH, w                ;to get
subwfb  Digits+1, f             ;remainder
movf    Digits, w               ;Split remainder (0-99)
to two decimals
mullw   D'205'                  ;
movlw   D'32'                   ;Multiply by 0.1
mulwf   PRODH                   ;(205/256 * 32/256)
movf    PRODH, w                ;
movwf   Digits+1                ;Save result
mullw   D'10'                   ;and then multiply it by 10
movf    PRODL, w                ;Subtract from original
subwf   Digits, f               ;Save remainder
return                          ;Done

 file: /Techref/microchip/math/radix/b2bu-10b3d-mullw-dd.htm, 2KB, , updated: 2011/3/6 17:07, local time: 2021/12/7 07:10, TOP NEW HELP FIND:  54.158.251.104:LOG IN

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