from Daniel Serpell

; ======================================================== bin2ascii ; Input: reg. W ; Output: d2 / d1 / d0 (assumed in the same bank) ; Assumed "banksel d0" ; Used 40 instructions / 30-39 cycles (counting CALL/RETURN) ; average 34.77 cycles (from 0..255). clrf d2 clrf d1 ; Test if W is more than 199 (200 to 255) addlw .256 - .200 btfss STATUS,C goto digit100 bsf d2,1 ; Here we are in the 200 - 255 range, so it is possible to ; skip the .100 and .80 parts addlw .256 - .80 goto digit40 ; Now, we have a number from -200 to -1 (0..199), ; we add 100 to detect -100 to -1 (100..199). digit100 addlw .100 btfss STATUS,C goto $+3 bsf d2,0 addlw .256 - .100 ; Now, we have a number from -100 to -1 (0..99), ; we add 20 to detect -20 to -1 (80..99). addlw .20 btfss STATUS,C goto digit40 bsf d1,3 ; We skip the 4 and 2, as the largest value is 8 + 1 = 9. addlw .256 - .20 goto digit10 ; Now, we have a number from -80 to -1 (0..79), ; we add 40 to detect -40 to -1 (40..79). digit40 addlw .40 btfss STATUS,C goto $+3 bsf d1,2 addlw .256 - .40 ; Now, we have a number from -40 to -1 (0..39), ; we add 20 to detect -20 to -1 (20..39). addlw .20 btfss STATUS,C goto $+3 bsf d1,1 addlw .256 - .20 ; Now, we have a number from -20 to -1 (0..19), ; we add 10 to detect -10 to -1 (10..19). digit10 addlw .10 btfss STATUS,C goto $+3 bsf d1,0 addlw .256 - .10 ; Now, we have a number from -10 to -1 (0..9), ; we add 58 to bring it from 48 to 57 (0..9). addlw .58 movwf d0 movlw 0x30 xorwf d1,f xorwf d2,f return

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